Blights

Chemical pesticides: ask before you spray

The source lists insecticides and fungicides for shoot fly, stem borer, aphids, fall armyworm, leaf blights, rust and downy mildew. Many are hazardous, and some may be restricted. Choose a product only with your local Agriculture Officer.

Follow the instructions on the product label. Consult your local Agriculture Officer before use.

Source

Crop Production Guide – Agriculture 2020 (Directorate of Agriculture, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Maize – Pest & disease management, pp. 113–114

Region

Tamil Nadu

Last updated

2026-11-04

Pests and diseases: ask before you spray

The source lists many chemical sprays for aphids, leaf-eating caterpillars, diamondback moth, club root, leaf spots, leaf blight, ring spot, downy mildew and black rot. Choose any product only with your local Horticulture or Agriculture Officer.

Follow the instructions on the product label. Consult your local Agriculture Officer before use.

Source

Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Cabbage – Plant protection, pp. 121–123

Region

Tamil Nadu

Last updated

2026-11-04

Pests and diseases: non-chemical measures in the source

Cutworms: summer ploughing, light traps (7–10 pm), pheromone traps (8/acre), hand-collecting larvae, NSKE 5% or Bacillus thuringiensis 2 g/l. Tuber moth: healthy tubers planted 15 cm deep, pheromone traps (5/acre), earthing up, and covering stored seed tubers with lantana or eucalyptus branches. Nematodes: do not grow potato year after year in the same field. Late blight and brown rot: use disease-free seed, good drainage, and remove affected plants. Viruses: use virus-free seed and pull out affected plants.

Source

Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Potato – Plant protection (non-chemical measures), pp. 135–137

Region

Tamil Nadu

Last updated

2026-11-04

Pests and diseases: ask before you spray

The source lists chemical treatments for cutworms, tuber moth, aphids, jassids, thrips, late blight, early blight and the aphids that spread viruses. Choose any product only with your local Horticulture or Agriculture Officer.

Follow the instructions on the product label. Consult your local Agriculture Officer before use.

Source

Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Potato – Plant protection, pp. 135–137

Region

Tamil Nadu

Last updated

2026-11-04

Leaf blight

Leaf blight can cause up to 50% loss in severe cases. Non-chemical measures in the source: field-resistant varieties (Muktakeshi, Jankhri), early planting to avoid heavy monsoon rain, healthy planting material, removing self-grown taro plants, and treating seed tubers with Trichoderma viride. Fungicide sprays and chemical dips for aphids, mealybugs and scales are also listed — ask your officer before using them.

Source

Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Taro – Leaf blight management, p. 146

Region

Tamil Nadu

Last updated

2026-11-04

Pests and diseases: ask before you spray

The source lists chemical treatments for leaf miner, aphids, rust mite, fruit-sucking moth, shoot borer, citrus butterfly, psyllid, fruit fly, mealybugs, nematodes, twig blight, scab and canker, and growth-regulator sprays for fruit set. Choose any product only with your local Horticulture or Agriculture Officer.

Follow the instructions on the product label. Consult your local Agriculture Officer before use.

Source

Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Acid Lime – Plant protection, pp. 15–16

Region

Tamil Nadu

Last updated

2026-11-04

Pests: non-chemical measures in the source

Stem borer: locate the frass mat at the base of the bush, remove it, and push a thick wire into the bore hole to kill the larva. Tea mosquito bug: monitor regularly and remove alternate hosts such as neem, cashew and guava nearby. Neem-based azadirachtin is listed for thrips and mites. Chemical options for scales, thrips, aphids, mites, tea mosquito bug and blister blight are also listed — ask your officer.

Source

Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Tea – Plant protection, p. 195

Region

Tamil Nadu

Last updated

2026-11-05