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The low productivity in guava because of traditional planting distance (6-7 m apart) with no canopy management practices. Guava under traditional and high density planting system, though it gives high yield during initial stage but as the tree advances in age light interception and aeration decreases inside the canopy due to shading and overcrowding, resulting low yields and poor quality. In order to develop efficient canopy architecture for HDP and traditional planting system, the ICAR-CISH has standardized training system and canopy management with objective to have sustained high yield and quality of guava.
Guava bears flower on current shoots produced on mature wood laterally or terminally. In general flowers are produced in the leaf axils in 1 or 2-3 in cluster. The crop load depend on number of new shoots, hence more new shoots resulting more fruiting surface area.
High Density Planting System
Accommodation of more plants per unit area is known as high density planting system. Since guava respond well to pruning and fruiting starts 40-50 days after pruning and more new shoots emerged on which more flowers and fruits appears, thus yield increased. For successful HDP suitable canopy shape and its management is prerequisite. Guava is usually planted 6-7 m distance accommodating 277 to 204 plants per hectare the yield vary 35-80 kg/tree with yield per hectare 15-12 t/ha. In traditional planting density usually fruiting takes place on high on the tree.

When fruit trees grow naturally; canopy varies greatly from species to species and cultivar to cultivar. It is mainly due to climate, planting density, rootstock, method of propagation, training, pruning, regularity of bearing, soil type, nutrition, irrigation, intercrop, growth regulators used, diseases, pests, environmental pollution etc. Plant canopy means the spread of branches and foliage of a plant.

Canopy management of the fruit tree deals with the development and maintenance of their structure in relation to the size and shape for the maximum productivity and quality. The basic concept in canopy management of a perennial tree is to make the best use of the land and climatic factors for an increased productivity in a three dimensional approach. Ideal canopy means fruit trees should have adequate number of fruiting units, it allows sufficient light and ventilation in to canopy and it should support adequate foliage and protect the fruits from sunburn. It should avoid overlapping of foliage to minimize parasitic leaves. It offers scope for effective coverage of sprays. It should avoid the buildup of microclimate, congenial for pest and diseases development. Tree vigour, light, temperature and humidity play a vital role in the production and quality of the fruits.

Introduction
Mango (Mangiferaindica L) known as “the king of fruits” and “Apple of the Tropics” is most popular fruit in the tropics and sub-tropics. It moved from India to different countries and has gained popularity around the world. It has long been associated with the Indian culture and religious functions. Among different states, Uttar Pradesh and Andhra Pradesh constitute 23.64 per cent and 22.99 per cent share in the total mango, respectively, in the country. In 2023, Mango production had a total export volume of 78.56 billion MT. India is the biggest mango producer with a total production volume of 25 million MT of mangoes during the year. The top 10 mango producers in 2023 include India (25 million MT), China (3.8 million MT), Indonesia (3.6 million MT), Pakistan (2.7 million MT), Mexico (2.4 million MT), Brazil (2.1 million tons), Malawi (1.7 million MT), Thailand (1.6 million MT), Bangladesh (1.5 million MT) and Vietnam (1.4 million MT). As regards world-wide mango exports, Mexico is the biggest mango exporter with total exports worth $576.36 million in 2023. It was noted that Mexico’s mango exports increased by 5.09% from the previous year. The top 10 mango exporting countries in 2023 include the following:

1. INTRODUCTION

Canopy management is the manipulation of tree canopy to optimize its production potential with excellent quality fruits. In many fruit crops, increase in production with enhanced fruit quality is obtained by managing canopies of short statured trees. Small trees capture and utilize the sunlight properly and results into better fruit production.

The fruit growers desire to regulate the growth and development of their trees in a scientific manner. This is because it is not always wise to allow a plant to develop naturally, since unwanted portions may develop which may affect the production. The removal of unwanted parts of plant is thus known as pruning. The practice of pruning as and when performed in an appropriate manner, keeps the plant in such shape and condition as to yield fruits of desired quality.

Canopy management depends on the nature and growth pattern of plant, number of plants /ha and pruning techniques used by the farmers in their fields. Pruning should be done when trees are young to establish their basic shapes and sizes, and continued as trees mature. Trees that grow too close together shade out the lower canopy portions and in turn decrease their fruit setting. These trees are required to be pruned to allow the light to reach the top and lower sides of trees. Pruning is done either to encourage the growth (thinning) or to reduce the tree size (heading back). Thinning of bearing trees encourages vegetative growth, and removes interior branches, encouraging the outward growth of plants. Heading back reduces the outward canopy growth through topping and hedging of branches.

Training and pruning of horticultural crops is very important practice to obtain a strong frame work of tree and sustained productivity. It is necessary to understand the various terms used to make the subject more comprehendible.

Crotch: It is the angle made by the scaffold limb to the trunk or the secondary branch to the scaffold limb.

Head: The point on the trunk from which first branch arises.

Leader: It is the main stem growing from ground level up to the tip dominating all other branches.

Low head trees: Trees in which scaffold branches arise within 60-70 cm height from the ground level.

High head trees: Trees in which the scaffold branch arise 120 cm above the trunk.

Scaffold branches: The main branches arising from the head are known as scaffold branches.

Commercial capers are the immature flower buds, which have been pickled in vinegar or preserved in granular salt; they are used raw or cooked as condiment in different recipes. Semi- mature fruits (caper berries) and young shoots with small leaves may also be use as a condiment in salads or as an appetizer before meal. Capers and caper plants, wild and/or cultivated, are used in almost all the area of Capparis subgenus Capparis, extending from West Africa to the Norfolk islands in the Pacific, and most of the species are of alimentary or medicinal interest (Rivera, Inocencio, Obón & Alcaraz, 2003).

Capparis is a term coined by Theophrastus (4th cent. BC) and validated by Dioscorides (1st cent. AD) (Êáððáñéò), although it seems not to have come into wide use until the spread of the Arab world.
 
Caper and its relatives in several European languages can be traced back to Classical Latin Capparis “caper”. Latin Capparis, in turn, was loaned from Greek kapparis [êáððáñéò], whose origin (as that of the plant) is unknown but probably West or Central Asia. Another theory links kapparis to the name of the island Cyprus (Kypros [Êáðñïò]), where capers grow abundantly.

Carambola (Averrhoa carambola) is a fruit of warm tropical and sub- tropical areas of the world. The fruit is oblong with three to six longitudinal ribs, resulting in a star shaped cross section when cut. Usually they have five ribs which give rise to common name of ‘five corners’ or ‘star fruit’. The tree is medium-sized, attractive and evergreen growing to about 10m. The fruit has emerged as an interesting addition to the table fruit, not only as fresh fruit, but also for its juice, decorative uses and sherbet qualities.

Consumption of fruit and vegetables has dramatically increased globally during the past a few decades. These are living perishable biological entities which perform a number of metabolic functions and have a short life span. Once the fruit is harvested, respiration and transpiration continue, but only for as long as the fruit can draw on its own food reserves and moisture. It is this limited ability to continue vital metabolic functions which define fruit as perishable. It is also estimated that about 20% of all fruits and vegetables produced are lost each year due to spoilage. The process of the fruit spoilage is just the decomposition of the fruit itself. Once harvested, this begins to deteriorate until eventually it becomes unfit for consumption. This deterioration is known as decay and that leads to spoilage. Latter may be defined as “any sensory change (physical, visual, olfactory or flavour) which the consumer considers to be unacceptable. The gradual changes which cause deterioration and decay in fruits are due to certain organisms and chemicals present in the food and outside the food. Carbohydrates play a major role in the fruit spoilage process (Prasanna et al., 2007) by way of depolymerization leading to decreased molecular size with concomitant increase in the levels of ripening inducing specific enzymes, whose target differ from fruit to fruit. The major classes of cell wall polysaccharides that undergo modifications during ripening are pectins, cellulose, starch, and hemicelluloses (Hallet et al., 2005). The focus of this chapter is to provide information about carbohydrate metabolism during fruit spoilage.

Food is composed of three main constituents viz; carbohydrates, proteins and fats and their derivatives. In addition to these constituents, inorganic mineral elements and diverse organic compounds like vitamins, pigments, flavouring compounds, enzymes, and acids are also present. Carbohydrates, proteins, fats and vitamins are organic in nature. The percentage of water is large in certain foods. The variation in structure, texture, colour, flavour and nutritive value is because of the varying proportions and arrangements of these constituents.

Carbohydrates are important in foods as a major source of energy, to impart crucial textural properties, and as dietary fiber which influences physiological processes. Digestible carbohydrates, which are converted into monosaccharides, which are absorbed, provide metabolic energy. Carbohydrates account for more than 70% of the caloric value of the human diet. It is recommended that all persons should limit calories from fat to not more than 30% and that most of the carbohydrate calories should come from starch. Non-digestible polysaccharides (all other than starch) comprise the major portion of dietary fiber.

Global climate changing has been a focus for a long time in many fields, the increasing CO₂ concentration in atmosphere was considered as one main driving force for global warming. The increases in greenhouse gasses in the atmosphere contributed to raise concerns over climate change enhanced the role of forests and plantations in the global carbon cycle are growing as a great issue. Carbon dioxide (CO₂) is one of the main greenhouse gases because a huge volume of CO₂ is added to the atmosphere, when compare to all other greenhouse gases and made itself as a primary agent of global warming. It contributed 72 per cent of the total anthropogenic greenhouse gases, causing between 9-26 per cent of the greenhouse effect (Kiehl and Trenberth, 1997). According to the Intergovernmental Panel on Climate Change (IPCC), there has been an unprecedented warming trend during the 20th century. Scientists now have estimated that the average global surface temperature is likely to rise by 1.4 to 5.8°C by the end of the 21^st century (IPCC 2007).

The IPCC estimates that the level of carbon dioxide in today’s atmosphere is 31 per cent higher than it was at the start of the Industrial Revolution about 250 years ago. An atmospheric level of CO₂ has risen from 280 ppm at the pre-industrial to the present level of 375 ppm. Most of the increase has occurred in the second half of the 20^th century. The mitigation of climate change demands, determined commitment of scientists to develop strategies to effectively manage the issues of the changing climate through carbon sequestration. Carbon sequestration is ought to be a promising solution for reducing atmospheric carbon dioxide, an important greenhouse gas.

Cardamom thrips: Sciothrips cardamomi: Thripidae

Thysanoptera

This thrips attacks other crops like amomum,  tea, colocasia, grapevine, castor, cotton, ginger and turmeric also. The thrips are minute greyish brown insects with fringed wings. They breed on unopened leaves, spindles, leaf sheath, flower bracts and floral tubes .

The young seedling stock and rooted cuttings as well as nursery plants require proper care and nourishment. The operations to be performed regularly in nurseries are as follows.

1. Shifting of plants: The nursery plants grown in the pots or polybags are to be shifted once in 2-3 months to avoid root penetration into the soil. If the taproot penetrates deep into the soil, the chances of mortality increases. Hence shifting of grafts and potted plants has to be done at the said intervals
2. Removal of rootstock sprouts: Once has to keep a constant watch on the sprouts arising on the rootstock, which are to be nipped off as and when, observed, to encourage rapid growth of scion shoots.
3. Irrigation: The young tender seedlings are exacting in their water requirement. Proper and judicious irrigation is an important indicator of a healthy nursery, which solves many problems in the nursery. There are many methods adopted in nurseries. However, it depends upon water availability, kind of nursery plants and its growth stage, etc. These methods are flow or flood irrigation, furrow irrigation, overhead irrigation through rose cans, automizers or sprinkler systems, etc.

Aphids: Myzus persicae : Aleyrodidae

Aphids are considered as the most serious pest of carnation. Both adults and nymphs suck sap from the leaves and debilitate the plants. They transmit carnation ring spot and carnation mosaic virus disease. They are thus more important as vectors. Regular monitoring for the incidence of the aphid and spot spray-ings of contact insecticides on the shoot tips can easily manage the pest.

Carrot (Daucus carota Stova condolle) is one of the most important and widely used root vegetable belonging to the family Umbelliferae. The seed production can be done during September – October in plains and in hills the sowing takes place in June and roots are replanted during the first week of October.

Method of seed production

Carrot is a cross-pollinated crop and self-pollination occurs to the extent of 0-5%. Crosspollination is mainly through insects. Seeds should be allowed to set by cross-pollination in isolation. Seed production is done by seed to seed and root to seed method. In seed to seed method, the matured roots are left to produce flowers and seeds in the place where seeds are sown initially. In root to seed method, roots at edible maturity should be uprooted and the roots of true to varietal characteristics should be selected and transplanted to the well prepared field after proper trimming of roots and shoots. This root to seed method is preferred for seed production in carrot since the root rot infection is high in seed to seed method of seed production.

The isolation distance maintained between the fields of other varieties and the fields of the same variety not conforming to varietal purity requirements for certification is 1000 metres for foundation and 800 metres for certified seed production. During mother root production an isolation of 5 metres should be followed.

Carrot (Daucus carota, 2n = 2x = 18, family Apiaceae or Umbelliferae, cross-pollinated) is among the top ten most economically important vegetable crops globally in terms of area, production and market value (Simon et al, 2008). Almost half of the more than 42 million tons of the global production -by far- is harvested in China, followed by Uzbekistan, Russia and the United States of America. Ukraine, Poland, United Kingdom, Germany, France and Japan complete the top 10.This production comes from approximately an area of 1.5 million ha giving a productivity of 28 tons/ha. India produced 1.6 million tons of carrot during 2017-18 from 96000 ha area resulting into a productivity of 16.66 tons/ha. In India, top 7 states in carrot production are Haryana, Bihar, Punjab, MP, UP, Karnataka and Assam. Because of breeding of cultivars adapted to both summer and winter seasons, carrot is available round the year.

The conventional orange colour varieties of Europe are rich in beta carotene, a precursor of vitamin A and contain appreciable quantity of thiamine and riboflavin. The red carrots are rich in lycopene, an important pigment for healthy eyes and general body growth, besides having anti-cancerous properties. Black carrots are rich in anthocyanins. Further, carrots have medicinal properties.

Carrot has two distinct groups with regard to flowering and seed production. These are tropical and temperate types. Tropical or oriental cultivars are annual and adapted to high temperature conditions and these do not require low temperature exposure for flowering. They flower and set seeds freely in Indian plains after winter months with the advent of long day conditions in spring. The temperate/European types behave like biennial crops and require 6-8 weeks of vernalization at mean temperature of 4.8 to 10° C after they have passed the full root development phase for production of seed stalks (Sureja and Kalia, 2012).

Carrot (Daucus carota L.) is a cool season root vegetable and temperature is the important factor affecting root shape and colour, besides soil type and moisture content of soil. It provides an excellent source of vitamin A and fiber in the diet. The genus Daucus, which include carrot, has many wild forms that grow mostly in the Mediterranean region and South West Asia. Representatives are found in Africa, Australia, & North America. For Daucus carrot L. it is generally agreed that Afghanistan is the primary center of genetic diversity and therefore the primary source for dissemination. Asia Minor, Afghanistan, North West India, Iran and Turkey are the centers of origin of carrot. Banga (1957& 1963) has provided evidence that the purple (anthocyanin) carrot together with a yellow variant spread from Afghanistan to Mediterranean area as early as 10th and 11th century. It is known in Western Europe in 14th and 15th century, China in 14th century and Japan in 17th century. The European carrot (Carotene carrot) derived from the Asiatic (anthocyonin containing) form of carrot (tropical carrot).  Afghanistan is the centre of diversity of the purple coloured carrot (anthocyanin). Integration of Asiatic and European carrots has given the present day forms. The yellow coloured (carotene rich) forms were also thought as mutants of anthocyanin carrots. The yellow mutants were traced in Asia Minor in 10 and 11th centuries, Spain in 12th century, North Western Europe in 14th century and England by 15th century.  The crop was introduced to China during 14th century and to Japan during 17th century. D. carota and D. sativus are only cultivated species of the genera with Chromosome No. 2n = 18. All forms have same chromosome number. 

Carrot, Daucus carota L. under the family Apiaceae (Umbelliferae) having chromosome numbers 2n = 2x = 18 is a root vegetable, grown in spring, summer and autumn in temperate regions and during winter in tropical and sub-tropical regions all over the world. It is important root crop of the European countries, USA, China, Japan, Korea and India. It is grown in almost all parts of India, both in plains and hills. Most of the carrots are typically orange in colour, though purple, black, red, white and yellow cultivars are also available. It is consumed fresh as salad or cooked as vegetable. It is also used for fresh juice, pickles and for the preparation of sweets. Leaves are used as fodder. Essential oil from the seeds is used for flavouring liquors and foods. It contains highest amount of β carotene (pro-vitamin A) among the common vegetables. It is also a good source of vitamin K, and vitamin B6.
Origin, domestication and adaptation in India
Carrot probably originated in Afghanistanin, the region where the Himalaya and Hindukush mountains are confluent. The secondary centres of diversity are probably Ehiopia and north America. Its domestication occurred in Afganistan and adjacent regions of Russia, Iran (previously called Persia), India, Pakistan and Anatolia (Van der Vossen and Sambas, 1993). From its centre of origin in Afghanistan, it was taken by the Arabs to eastern Mediterranean and Spain in 12th century. It was introduced in China in 13th or 14th century, in England during 15th century, in Japan in early 17th century and in the USA in 1620 AD.

Botany: Cashew belongs to the Family Aricardiaceae. A small evergreen tree native of tropical America from Mexico to Peru and Brazil but now cultivated largely in Malabar, Kerala, Karnataka, Tamil Nadu and Andhra Pradesh and to some extend in Maharashtra, Goa, Odisha and West Bengal

The commercial production is mainly confined to India, Mozambique, Tanzania, Kenya; Brazil, Philippines, Malaysia and Sri Lanka.Cashew is an important foreign earning crop of India, remarking second (29%) in the international trade of the nuts. It is a crop of marginal lands and can be grown under rainfed conditions.

Soil and climate: It grows up well in all soils. Red sandy loam is best suited. Plains as well as hill slopes upto 600 - 700 feet elevation are suitable for cultivation. Season: June - December. Propagation: Soft wood grafting, air layer and epicotyl grafting. Requirement of plants: 200 plants/ha. Preparation of field: Pits of 45 cm3 size are dug and filled up with a mixture of soil + 10 kg FYM + one kg neem cake and 100 g Methyl parathion 1.3 %.

The Tea mosquito bug : Helopeltis antonii : Miridae

The host range of this bug also includes tea, neem, moringa and guava. The attack can cause inflorescence blight, terminal drying of young shoots and heavy yield loss. The adult is a reddish brown bug with black head, red thorax, and black and white abdomen. The easiest identifying character for this pest is a pin like process on the scutellum mid dorsally on the thorax. It is reddish brown, erect and knobbed, and would seem as a pin inserted into the scutellum.

Cassava scale : Aonidomytilus albus: Diaspididae

White elongated scales appear in colonies on stems. Plants die in the field and under storage.  Stem becomes weak and dry, causing side branching to give bushy appearance.  Viability of planting material is reduced, resulting in poor establishment.