eChapters

The sense organs in an insect body are distributed on different parts and respond to a given stimulus such as light, sound, touch, chemicals etc. The sense organs may be classified as • Visual organs (or) photoreceptors • Auditory organs (or) organs of hearing

• Chemoreceptors which respond to chemicals

• Tacticle receptors which respond to touch

• Gustatory receptors which respond to taste.

Photoreceptors

Light is perceived by insects through a number of different sense organs and these are the organs that react with light and useful for vision. These are of different types, but most important are the compound eyes.

Compound eyes

Alimentary canal of an insect is a tubular structure passing through the body that provides the special internal environment for the food to be mechanically and chemically disintegrated and brought to the vicinity of absorbent cells. Hence, it is involved in the transport of nutrients to the individual cells. It is concerned with ingestion, trituration (chewing), digestion, absorption of nutrient material into haemolymph and egestion of unused food materials. It is tubular structure, which extends from mouth to the anus. It is divided into three distinct regions, namely fore-gut (stomodaeum), mid-gut (mesenteron) and hind-gut (proctodaeum). The fore- and hind-guts are ectodermal in origin and the mid-gut is endodermal.

Longitudinal and circular (intrinsic) muscles are usually associated with each of these three regions and by means peristaltic contractions move the food along the alimentary canal. The functional stomach is the mesenteron usually a circular valve-like fold separates the cavities between stomodaeum and mesenteron is known as stomodael or cardiac valve, and the one closing the entrance to the proctodaeum as the proctodaeum or pyloric valve.

Fore-gut

An insect’s mouth, located centrally at the base of the mouthparts, is a muscular valve (sphincter) that marks the “front” of the foregut. Food in the buccal cavity is sucked through the mouth opening and into the pharynx by contractile action of cibarial muscles. These muscles, located between the head capsule and the anterior wall of the pharynx, create suction by enlarging the volume of the pharynx (like opening a bellows). This “suction pump” mechanism is called the cibarial pump. It is especially well-developed in insects with piercing/sucking mouthparts.

• In most insects, life begins as an independent egg (ovipary).

• Majority of insects are oviparous. Egg stage is inconspicuous, inexpensive and inactive. Yolk contained in the egg supports the embryonic development.

• Eggs are laid under conditions where the food is available for feeding of the future young ones.

• Production of eggs by the female’s body is called oogenesis and the egg laying process is known as oviposition.

• The outer protective shell of the egg is called chorion. Near the anterior end of the egg, there is a small opening called micropyle which allows the sperm entry for fertilization. Chorion may have a variety of textures.

• Size and shape of the insect eggs vary widely.

Insects development

Once an insect hatches from the egg it is usually able to survive on its own, but it is small, wingless, and sexually immature. Its primary role in life is to eat and grow. If it survives, it will periodically outgrow and replace its exoskeleton (a process known as molting). In many species, there are other physical changes that also occur as the insect gets older (growth of wings and development of external genitalia, for example). Collectively, all changes that involve growth, molting, and maturation are known as morphogenesis.

Metamorphosis

• Metamorphosis actually means change in form Metamorphosis is derived from Greek word ‘Meta’ = Change, ‘morph’ = form or structure.

• The changes in the development from egg to adult, collectively called Metamorphosis (life cycle).

• Post-embryonic changes in form are collectively called as metamorphosis.

• Metamorphosis refers to the way that insects develop, grow, and change form. Metamorphosis include three developmental processes namely growth, differentiation and reproduction which takes place in larval, pupal and adult stages, respectively.

• Majority of insects pass through profound metamorphosis. The growth of an immature insect is accompanied by a series of molts or ecdysis, in which the cuticle is shed off and renewed. The number of molts varies in most insects from 4-8. However some undergo as many as 20 or more molts. A few insects like Bristle tail silver fish (apterygota) may continue molting even after reaching the adult stage. But most of the insects neither molt nor increase in size once then adult stage is reached. The intervals between the ecdysis are called Stadia. The term instar is applied to form of an insect during stadium. In numbering the instar, the form assumed by the insect between hatching from the egg and the first post embryonic molt is termed “First Instar”.

• It is the posterior most and largest region of the insect-body. It is The abdomen is the metabolic and reproductive centre, where digestion, excretion, and the sexual functions take place.

• All the definitive number of segments differentiate in embryo (Epimorphic condition) except protura (Anamorphosis)

• In general more segments are visible in more generalised hemimetabolus insects than in more specialised holometabolus insects. For example in Acridids all 11 segments are visible whereas in muscidae only 2-5 segments are visible

• The basic number of abdominal segments in insect is eleven plus a telson/ tail (Protura) which bears anus. Abdominal segments are called uromeres.

• The undivided tergel plates overlap the sternal ones and the membranous pleura are enclosed in between them.

• The posterior part of each segment overlaps the anterior part of the segment behind it and the two segments are joined by the inter-segmental membrane.

• There are eight pairs of abdominal spiracles. The first pair lies just in front of each tympanum and the other lie dorso-laterally on each of the tergites of the segment to eighth abdominal segments.

• The terga and sterna bear antecostal ridges. The internal dorsal and ventral longitudinal muscles run one antecostal ridge to the other and act as retractors. The contraction of these muscles helps the segments to be retracted. The external muscles originate from the posterior part of the segment and attach to the anterior part of the acrotergite of the next segment. Thus, protraction of these muscles help in the extension of abdomen. Hence, musculature running longitudinally between helps in the contraction and extension of the abdomen.

• The abdominal segments are conveniently divided into three subregions i.e. pregenital, genital and postgenital segments.

• The thorax is the organ of locomotion due to articulation of wings and legs and is connected with the by neck or cervix.

• Thoracic segments are made up of three sclerites namely, dorsal body plate tergum or nota, ventral body plate sternum and lateral plate pleuron.

• Second and middle tagma which is three segmented, namely prothorax, mesothorax and metathorax. Meso and metathorax which bear wings are called as Pterothorax.

• In the apterygote insects the three thoracic segments are similar in size and structure. In the pterygote insects the thorax is highly modified.

• The prothorax is quite large and is somewhat independent of the other segments. The large shield that covers the dorsal and lateral sides of the prothorax is the pronotum.

• The pronotum is the dorsal sclerite of the prothorax, which can be highly modified in various orders such as the Hemiptera, Blattaria, and Coleoptera. E.g undivided and Saddle shaped in grass hopper, Shield like in cockroach.

• Cockroaches have pronotums that extend forward over the head.

• Scarab beetles and other beetles may also have unusual pronotums.

• Treehoppers have some of the most bizarre pronotums of all insects.

Light spectrum holds rich information about the world. The spectrum of natural illumination changes with daily cycle and objects differ in spectral reflection or emission properties. Like many other animals, insects use chromatic information to f ind favorable habitat, to efficiently locate food sources and to identify conspecific mates using the spectral information. Pollinating insects such as many species of bees and butterflies use their color vision to maximize success in foraging. They detect flowers, memorize the colors and patterns of rewarding flowers, and preferentially collect nectars from the flowers in their later visits. Visual guidance of behaviour is challenging when photons, the elementary particles of light, are scarce. To produce a reliable representation of the surroundings, the visual system must (i) ensure absorption of a sufficient number of photons into a photoreceptor, (ii) house photoreceptors that efficiently convert each photon absorption into a neural signal, and (iii) process these signals appropriately. Insects are a numerous and diverse class of arthropods that have evolved to occupy ecological niches from the brightest to the darkest.

Antennae are paired, highly mobile, segmented appendages present between or below or behind the compound eyes. The antennae arise from the 2nd or antennal segment of the head possessing nerves coming from deutocerebrum of the brain. Antennae are absent in order protura and class Arachnida whereas 2 pairs of antenna (antennules) are present in class Crustacea.

Antennae are set in a socket of the cranium called antennal socket (anetnnifer) and connected by an articulatory membrane which allows free movement of antenna. Antennal socket is provided with an antennal suture. Although antennae vary widely in shape and function, all of them can be divided into three basic parts:

• Scape

• Basal segment, larger than other segments and articulates with the head capsule. It is provided with intrinsic muscles.

• Pedicel

• Second segment of antennae. In this, mass of cells called Johnston organ (auditory) is present (eg. houseflies). The above two segments have intrinsic muscles ie., their own muscles. In honey bee, wasps pedicel forms the pivot between scape and flagellum.

• Flagellum/Clavola

• The remaining segments or annuli or flagellomeres are called flagellum which lack individual muscles. Flagellum is supplied with many sensory receptors that are connected by nerves to brain. Flagellum is further divided into three parts

Endoskeleton of the Head (Tentorium)

• The tentorium forms during development when 2-4 pairs of apophysis/ apodemes (finger-like invaginations of exoskeleton) fuse internally to create a “bridge”.

• The major components of the tentorium are the anterior tentorial arms, the posterior tentorial arms, the dorsal tentorial arms, and the tentorial bridge.

• The anterior tentorial arms originate as invaginations at the lateral limits of the frontoclypeal suture. The coalescence of the anterior tentorial arms forms a more or less solid structure, the tentorial bridge.

• The posterior tentorial arms arise from pits at the ventral ends of the post occipital suture and they unite to form a bridge running across the head from one side to the other.

• In many insects, e.g. Orhtoptera, the central part of the composite tentorium enlarged to form a broad plate referred to as the Corporotentorium.

• The tentorium serves as an internal “truss” that reinforces the head capsule, cradles the brain, provides attachment for muscles and provides a rigid origin for muscles of the mandibles and other mouthparts. The antennal muscles also arise from the tentorium.

Body Segmentation

In general, insect body is divided in to a series of segments, which in primitive arthropods are known as “somites” or “metameres”. During the process of evolution, these somites gets fused with each other in different ways forming the body parts of the existing arthropods. The type of arrangement of these body segments in embryonic stage is known as primary segmentation while in adult insects is known as the secondary segmentation which differ from primary in having a sclerotized membranous intersegmental region.

In adult and nymphal insects, and hexapods in general, one of the most striking external features is the amalgamation of segments into functional units. This process of tagmosis has given rise to the familiar tagmata (regions) of head, thorax, and abdomen. In this process the 20 original segments have been divided into an embryologically detectable six-segmented head, three-segmented thorax, and 11-segmented abdomen (plus primitively the telson), although varying degrees of fusion mean that the full complement is never visible.

Types of body segmentation.

(a) Primary segmentation, as seen in soft-bodied larvae of some insects. (b) Simple secondary segmentation. (c) More derived secondary segmentation. (d) Longitudinal section of dorsum of the thorax of winged insects, in which the acrotergites of the second and third segments have enlarged to become the postnota. (After Snodgrass 1935)

American Ecologist Whittaker (1969) proposed the five kingdom system of classification. In his ‘Five Kingdom System’, he added three more kingdoms in to Linnean model of two kingdom system. These were: Monera, Protista and Fungi. Whittaker succeeded to overcome the difficulties as well as demerits of two, three and four kingdom systems and to represent the living organisms according to the evolutionary relationships among themselves. He also defined the kingdoms by a number of special characteristics such as whether the organisms possessed a true nucleus or not. Whittaker’s five kingdom system of classification is based on (a) mode of nutrition (b) cell structure and complexity (c) phylogenetic relationship (d) body organization and (e) reproduction.

The large branches within the Animal Kingdom evolutionary tree are ‘phyla’ (the singular being ‘phylum’). ‘Animal phyla’ outlines thirty three phyla, although there are still disputes and disagreements concerning how many phyla are needed to classify the less well-known species. The most easily recognised are Porifera, Cnidaria, Arthropoda, Nematoda, Annelida, Mollusca, Platyhelminthes, Echinodermata, and Chordata. Animal phyla each comprise a branch of the evolutionary tree and these branches are always connected to other branches.

Human beings came into existence 1 million years ago. Insects which constitute 70-90% of all animals present in this world came into existence 250- 500 million years ago.Insects are highly specialized group of invertebrates belonging to phyla arthropoda characterized by having a bilateral symmetrical body covered by Exoskeleton chitin; with jointed appendages provided with independently movable muscle and inserted in to special pockets of exoskeleton; with a haemocoelic body cavity containing the circulating blood in which are bathed the internal organs; with a dorsal heart and decentralized ventral nerve cord; and with tracheal system for respiration; metamorphosis direct or indirect.

The insects are bilaterally symmetrical tracheate Arthopods is which the body is divided into head, thorax and abdomen. A single pair of antennae is present and head also bears a pair of mandibles, a pair of maxillae,. The thorax possess three pairs of legs and usually two pairs of wings. The abdomen is devoid of any ambulatory appendages and the genital opening is situated near the posterior end of the body. Post embryonic development is rarely direct and metamorphosis usually occurs.

Insect definition

Insects (from Latin insectum, a calque of Greek ?ντομον [éntomon], “cut into sections”) are a class of invertebrates within the arthropod phylum that have a chitinous exoskeleton, a three-part body (head, thorax and abdomen), three pairs of jointed legs, compound eyes and one pair of antennae.

The term Information and Communication Technologies (ICT) encompasses a broad spectrum of electronic tools that converge to facilitate information processing, communication, transmission, and display. Scholars like Michiels and Van Crowder (2001) define ICTs as a constellation of electronic technologies capable of transforming organizations and reshaping social relations. In the context of agriculture, the integration of ICT holds significant promise, offering a myriad of advantages ranging from accelerating agricultural growth to empowering marginalized farming communities. This review examines the need, catalytic role, advantages, scope, and limitations of ICT in agricultural extension, elucidating its potential and challenges in promoting sustainable rural development.

Need for ICT in Agriculture Extension

1. Accelerating Agricultural Growth: ICTs play a pivotal role in catalyzing agricultural development by providing timely access to critical information, knowledge, and resources.

2. Expanding Knowledge Resources: ICTs serve as repositories of agricultural knowledge, enabling extension workers and farmers to access comprehensive information on best practices, innovations, and market trends.

3. Facilitating Information Services: ICTs enhance the dissemination of agricultural information and advisory services, enabling farmers to make informed decisions on crop management, pest control, and market opportunities.

Introduction

Reviving the agricultural economy is a crucial endeavor with far-reaching implications for food security, economic prosperity, and sustainable development. Several key strategies can be adopted to achieve this goal. First, policymakers must prioritize agriculture by providing necessary f inancial support, infrastructure development, and research and development investments. Adequate credit facilities and subsidies can help farmers access essential resources and modern technology, boosting productivity and efficiency (Asian Development Bank, 2018). Promoting sustainable agricultural practices is vital to ensure long-term viability. Encouraging the adoption of eco-friendly methods such as organic farming, crop rotation, and water-efficient irrigation can enhance environmental resilience while safeguarding natural resources for future generations. Empowering farmers through training and education is essential. Equipping them with the latest knowledge and techniques enhances their capacity to adapt to changing conditions and make informed decisions about crop selection, pest control, and market opportunities. Furthermore, enhancing market linkages is critical to connect farmers with consumers and ensure fair prices for agricultural produce (African Development Bank, 2022). Developing efficient supply chains and reducing post-harvest losses can improve income prospects for farmers and attract more youth to the sector. Lastly, encouraging private sector involvement and investment in agriculture can accelerate growth and innovation. Public-private partnerships can create opportunities for technological advancements, value addition, and market expansion (Liu & Lee, 2018). Reviving the agricultural economy requires a collaborative effort involving governments, farmers, the private sector, and civil society. By addressing challenges, investing in modernization, and promoting sustainable practices, nations can create a thriving agricultural sector that contributes to food security, economic development, and environmental sustainability (Brown, 2021).

Introduction

The process of recycling involves the conversion of waste materials into reusable products or materials and aims to reduce the consumption of fresh raw materials, minimize energy use, and mitigate trash creation. The primary objective of recycling is to effectively preserve finite resources, safeguard the natural environment, and mitigate the volume of garbage deposited in landfills or subjected to incineration (Lienig et al., 2017). Recycling refers to the systematic transformation of discarded materials into fresh resources and tangible products. The aforementioned term often encompasses the process of extracting energy from waste materials. The recyclability of a material is contingent upon its capacity to regain the characteristics it has in its initial form. There exists an alternative approach to garbage disposal that has the potential to save resources and mitigate the release of greenhouse gases. Additionally, it can mitigate the waste of potentially valuable resources and diminish the use of pristine raw materials, therefore reducing energy consumption, air pollution resulting from incineration, and water pollution stemming from landfill practices. The promotion of environmental sustainability is achieved by the removal of raw material input and the redirection of waste output within the economic system. The increasing volumes of trash have given rise to several environmental challenges, including air pollution, water pollution, soil contamination, and biodiversity loss. The emission of diverse greenhouse gases from solid waste landfills also contributes to the phenomenon of global warming. At now, the predominant techniques for solid waste disposal are open dumping and landfilling. Various alternative techniques, such as pyrolysis, gasification, anaerobic digestion, composting, and bio-methylation, are used to extract valuable resources from solid waste materials (Griffin et al., 2018).

Introduction

In the face of a growing global population and increasing pressures on natural resources, the quest for sustainable and efficient agricultural practices has become highly significant. The integration of livestock with cropping systems and grasslands stands out as a holistic approach that not only addresses these pressing challenges but also unlocks a myriad of economic benefits. This chapter delves into the profound significance of integrating livestock with cropping systems and grasslands in modern agriculture, exploring how this synergistic combination enhances resource utilization, promotes resilience, and fosters a thriving agricultural sector.

The roots of integrated farming practices can be traced back to ancient agricultural traditions, where farmers instinctively recognized the advantages of combining crop cultivation and animal husbandry (Devendra and Thomas, 2002). Over time, this integrated approach evolved and adapted to different cultural and geographical contexts. In traditional mixed farming systems, livestock provided essential services such as draft power (Gomiero et al., 2011), manure for fertilization, and protein-rich food. As agriculture progressed with technological advancements, there was a shift toward specialized monoculture and intensive livestock farming (Herrero et al., 2013). However, the unintended consequences of these systems, including soil degradation, environmental pollution, and declining rural livelihoods, paved the way for a resurgence of interest in integrated farming methods (FAO, 2020).

Introduction

The changing climate and its variability are a big concern for the human being. The recurrent droughts and floods, which are the results of this changing climate seriously hamper the livelihood of billions of people who depend on land for most of their needs. According to the United Nations Framework Convention on Climate Change (UNFCCC) (UNFCC; 1992), “climate change is the change that can be attributed directly or indirectly to human activity that alters the composition of the global atmosphere and which is in addition to natural climate variability observed over comparable time periods” The Intergovernmental Panel on Climate Change (IPCC report, 2022) issued a cautionary statement regarding the imminent attainment of the 1.5oC threshold by the global climate system within the forthcoming 20-year period. It further emphasized that only implementing exceedingly stringent reductions in carbon emissions, commencing at present, would serve as a viable measure to avert an impending ecological catastrophe.

Droughts: A time in which circumstances are significantly drier than average is referred to as a drought.

Floods: A flood is an abnormally large outpouring of water (or, on very rare occasions, other fluids) that covers normally dry ground.

Livelihoods: The term “livelihood” refers to a collection of activities that are carried out during one’s lifetime and are considered necessary to one’s day-to day existence. Obtaining necessities such as water, food, fodder, medication, shelter, and clothing are examples of such activities.

Introduction

Water retention is an important soil hydraulic property that affects how soil operates in an ecosystem and how it is managed. Hydrology, agronomy, meteorology, ecology, environmental protection, and many other soil-related professions employ soil water retention data. Some soil survey programs measure water retention. A soil survey can estimate water retention from other soil properties. However, these measurements are problematic during project design and in large-scale implementations (Rawls et al., 1991; Wo sten et al., 2001) since agricultural land needs rise periodically. Agriculture is using dry land. Food self-sufficiency and becoming a world food barn by 2045 necessitate agricultural land expansion (Mulyani and Agus, 2017). Water concerns afflict farming in this agroecosystem (Syam et al., 1996; Mulyani and Agus, 2017). Because of soil composition, much water stays in the earth. Tang et al. (2022).

For plant growth, soil water retention variables indicate how well the soil holds water. The dirt provides most of the plant’s water. Water in root layer dirt pores is absorbed by plants. Thus, soil water retention is the key factor affecting plant development and productivity. Plants can take in the soil pores’ water between the field capacity and the point where they always wilt. Field capacity occurs when the matrix potential and gravitational potential match. The most significant component for plant growth is soil water (Tang et al., 2022, Deng et al., 2016, Su et al., 2020). The soil’s physical features determine plant water availability. The amount of water available depends on clay minerals, organic matter, absorbed cations, soil texture and structure, and water availability. Thus, to prevent plants from experiencing water or groundwater stress, soil physical attributes must be investigated to determine groundwater availability (Kirkham 2023). Infiltration is crucial to groundwater availability. The amount of water that can penetrate the soil depends on its physical features, such as soil texture, organic matter, bulk density, porosity, aggregate stability/stability, and water content. Thus, soil water availability depends on its physical qualities, particularly its ability to absorb and transfer water. The physical properties of saturated soil affect how water travels through it, which affects runoff and infiltration (Sauer and Logsdon 2002).

Introduction

The current science and technology is highly developed and everything is at our fingertips. The drudgery that was involved earlier while doing any kind of activity is so much reduced at present. The use of technology is so important nowadays that it has become unavoidable in all fields. With the tools and techniques, most of the problems can be solved and so technology has become a part of our lives thereby making our lives better. Some of the trending technologies are Artificial Intelligence (AI), robotic process automation, 5G, Information and Communication Technology (ICT), Machine Learning (ML), Virtual Reality (VR) etc. With the application of all these technologies, every discipline whether it is infrastructure, medical science, transport, communication, etc. has become stronger than ever. Even the field of agriculture has become so advanced with these technologies. The enhancement of agricultural activities has become so important with the depletion of natural resources, less human labor, and the changing climatic conditions. All over the world agricultural technologies are adopted, disseminated, and practiced to increase production and productivity, improve livelihood and alleviate poverty (Kilima et al., 2013). Similarly, the main reason for the growing demand for ICT in agriculture is for the farmers to get up-to-date knowledge and apply the tools and techniques to improve their livelihood. However, the ultimate aim is to adopt sustainability in agriculture. Through ICT, farmers can get updated information on the market prices, weather forecast, emergence of pest and diseases and their management practices, planting materials, varieties, etc. This knowledge not only gives the farmer an efficient method of farming for more production but also empowers them with modern agricultural ways. The use of ICT in combination with other techniques enables the farmer to save time, use resources efficiently, and produce better quality products.

Introduction

Seed technology improves seed genetics and physiology. Variety creation, release, seed production, processing, storage, and certification are included. (Feistritzer, 1975). Organic farming began in the early 20th century due to constantly changing farming practices. Over 50 million hectares of certified organic agriculture are in Australia. “That discipline of study having to do with seed production, maintenance, quality and preservation” is seed technology. Organic seeds are fully produced with organic matter practices made with proven organic function and natural seed production, including seeding plants, with a set of guidelines prohibiting the use of manufactured products or chemicals to be sold as such. They must be produced by an accredited institution by an authorized person government agency. Organic seed is created by a planted crop and organically raised at least one generation for annual crops and two generations for annual and perennial plants. Organic farming is sustainable and eco-friendly. Farming needs better norms and standards to achieve biological goals. It is usually cold and people need lots of vegetables but have few organic, clean supplies. Organic farming in India needs a certain space and high-yield vegetable crops in national marketplaces to produce high-quality products. Indian agriculture uses chemical fertilizers, which can be minimized. Experiments have shown that it works well in conjunction. Inorganic and biological fertilizers boost yields, soil quality, and productivity.