🌸 Grapes — Nutrient Disorders,

This lesson covers grape nutrient disorders, major pests and diseases, and practical management recommendations.

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GROWTH REGULATORS, PHYSIOLOGICAL DISORDERS, PESTS

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AND DISEASES AND MANAGEMENT PRACTICES

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Pests

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Nematode

Carbofuran – 60 g/vine a week before pruning and irrigated profusely. The soil should

not be disturbed to atleast 15 days. Application of neem cake 200 g/vine also controls nematode.

We can afforded for application of P. fluorescens .

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Flea beetles

Phosalone – 2ml/lit after pruning and followed with 2 or 3 sprayings.

Thrips: Dimethoate – 2 ml/lit

Mealy bug: Monocrotophus – 2 ml/lit

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Diseases

Powdery mildew: Sulphur dusting @ 6-12 kg/ha

Downy mildew: Spray 1% BM

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Ripening

To get uniform ripening bunches are sprayed with 0.2% K chloride at 20 [th] and 40 [th] day

after berry set and clusters of seedless varieties are diped in 25 ppm GA (25 mg/lit) at calyptra

fall stage and repeated again at pepper stage to increase the size of berries.

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Yield

Seed less : 15 t/ha/yr

Muscat : 30 t/ha/yr

Pachadroksha: 40 t/ha/yr

Anab-e-shahi

and Arka hybrids : 20 t/ha/yr

Grapes should be harvested only after ripening. The heat requirement of most of

varieties ranges from 2900 to 3600 units.

The grape berries can be kept without spoilage for 7 days at room temperature. Grapes

can economically be stored upto 40-45 days in cold storage. The optimum storage temperature

recommended is -2 to -1.5°C.

Raisins from grapes form an important by product industry in several grape growing

countries in the world. Grapes of 17° brix and above are used for raisin making while 20-23°

brix is the standard.

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Summary Cheat Sheet

Topic	Key Point
Nutrient disorders	Visual symptom diagnosis is critical for timely correction in vineyards.
Disease complex	Downy mildew, powdery mildew, and anthracnose are major threats.
Pest concern	Nematodes and other pests require integrated preventive management.
Quality target	Brix levels guide harvest planning for table, raisin, and processing use.
Management frame	Combine nutrition, sanitation, and protection schedules for stable yields.

References

2 sources • [1] [2]

[1]

Class notes: HORT 181 - Grape nutrient disorders and disease management

[2]

Grape quality and brix standards (as cited in lesson text)