Physiological Disorders of Grapes.pptx

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1. PHYSIOLOGICAL DISORDERS OF GRAPES Presentation On COURSE NO .- FRSC-2.1.1 COURSE TITLE : TROPICAL AND SUB TROPICAL FRUITS By AgriHORTICO’S WORLD

2. PINK BERRY Most commonly seen in Thompson seedless and Tas -A-Ganesh Few berries become pink during berry softening time and later turn black after harvesting. Spraying a 0.2% Ascorbic acid and 0.25% Sodium diethyl dithiocarbamate at fortnightly intervals prior to berry softening.

3. BLOSSOM END ROT Caused due to Calcium deficiency Can be controlled by the application of calcium nitrate

4. CHICKEN AND HEN DISORDER Caused due to Zinc and Boron deficiency It may be also due to failure of fertilization Shot berries reduced in size but of normal shape Can be controlled by applying zinc before flowering.

5. SHOT BERRY Presence of underdeveloped and undesirable berries in bunches of grape. Mostly seen in varieties such as Perlette Dipping bunches at berry set stage in Ethephon@25ppm

6. WATER BERRY Flaccidness of berries in a bunch, which get wrinkled , withered ,soft watery nature of berries are observed These berries lack sugars , flavour and keeping quality Cluster dipping in Pottasium sulphate and Calcium sulpahate @1% is found more effective in reducing the problem

7. UNEVEN RIPENING Mainly seen in coloured varieties like Banglore blue,Beauty seedless and gulabi Ripened bunches contain green coloured unripened berries Condition is due to non -availability of sufficient leaf area Application of growth regulators like Ethephon@250ppm help to reduce the seriousness.

8. BUD AND FLOWER DROP Mostly seen in vigorous varieties like Thompson seedless , Pusa seedless , Bhokri , Kishmish etc. Main reason attributed is a temporary water deficit in developing flower cluster due to high rate of transpiration from developing leaves Application of GA(20 and 50ppm) or NAA(10ppm) to the vines. BARRENNESS OF VINE Varieties such as Anab -e- shahi and Pusa seedless, becomes erratic after a few years of good yields. Exact reason is not known Good management practices reduce the vegetative growth

9. CRACKING OF RACHIS Mostly seen in North India Caused due to Magnesium deficiency Can be controlled by application of Magnesium sulphate POST HARVEST BERRY DROP Weak pedicel attachment to the berries in varieties like Anab -e- shahi,Cheema Sahebi and Beauty seedless Spraying NAA @50ppm one week prior to harvesting PREMATURE DEFOLIATION Caused due to ecophysiological reasons Application of antitranspirants and growth regulators can reduce the problem.

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