Leaf spot

Rust and leaf spots

For rust and leaf spots (early and late leaf spot), spray mancozeb at 1000 g per hectare or chlorothalonil at 1000 g per hectare; if necessary, repeat the spray 15 days later. For combined infection of rust and leaf spot, the source also lists a 10% Calotropis leaf extract spray.

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)), Groundnut – Disease management (Rust, leaf spots), pp. 195–196

Region

Tamil Nadu

Last updated

2026-11-04

Chemical pesticides: ask before you spray

The source lists insecticides and fungicides for stem fly, aphids, whitefly, pod borers, rust, leaf spot and leaf curl. Many are hazardous, and some may be restricted. Choose a product only with your local Agriculture Officer, and spray only after the pest crosses the threshold level.

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)), Greengram – Pest & disease management, pp. 148–150

Region

Tamil Nadu

Last updated

2026-11-04

Chemical pesticides: ask before you spray

The source lists insecticides and fungicides for sesame pests, powdery mildew, leaf spots and root rot. 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)), Sesame – Pest & disease management, pp. 202–203

Region

Tamil Nadu

Last updated

2026-11-04

Chemical pesticides: ask before you spray

The source lists chemical sprays for epilachna beetle, whitefly, shoot and fruit borer, mites and leaf spot. Many are hazardous, and some may be restricted. Vegetables are eaten fresh, so choose any 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 – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Brinjal – Plant protection, pp. 64–66

Region

Tamil Nadu

Last updated

2026-11-04

Pests and diseases: ask before you spray

The source lists chemical sprays for thrips, root grub, nematodes and leaf spot / purple blotch. Choose any 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 – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Big onion – Plant protection, pp. 151–152

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 nematodes

The source says carrot is not much affected by pests. For nematodes: neem cake 1 t/ha at planting; or a mustard bio-fumigation crop followed by neem cake 250 kg/ha with Purpureocillium lilacinus 5 kg/ha. A leaf-spot spray (chemical) is also listed — ask your officer before using it.

Source

Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Carrot – Plant protection (nematode), p. 129

Region

Tamil Nadu

Last updated

2026-11-04

Pests and diseases: ask before you spray

The source lists chemical treatments for Cercospora leaf spot and Rhizoctonia root rot, and lists leaf miner and flea beetle as pests. 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)), Beetroot – Plant protection, p. 133

Region

Tamil Nadu

Last updated

2026-11-04

Pests and diseases: ask before you spray

The source lists chemical treatments for leafhoppers, aphids, whitefly, ash weevils, leaf spot and powdery mildew (neem-based azadirachtin is listed for ash weevils). 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)), Cluster bean – Plant protection, pp. 107–108

Region

Tamil Nadu

Last updated

2026-11-05

Pests and diseases: ask before you spray

The source lists chemical treatments for white grub, stem weevil, leafhoppers, aphids, ash weevils, pod borer, powdery mildew, rust, anthracnose, leaf spot and root 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)), French bean – Plant protection, pp. 111–113

Region

Tamil Nadu

Last updated

2026-11-05

Pests: non-chemical measures in the source

Leaf-eating caterpillar and leaf webber: collect and destroy affected parts with caterpillars, and set a light trap (1/ha) to catch adults. Amaranthus weevil: destroy wild amaranthus nearby and affected plant parts with grubs and adults. The source advises avoiding sulphur sprays on amaranthus; a chemical leaf-spot spray is 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)), Amaranthus – Plant protection (pests), p. 156

Region

Tamil Nadu

Last updated

2026-11-05

Pests and diseases: ask before you spray

The source lists chemical treatments for whitefly, mosaic vectors, Cercospora leaf spot and tuber 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)), Tapioca – Plant protection, pp. 141–142

Region

Tamil Nadu

Last updated

2026-11-04

Chemicals: ask before you use

The source also lists chemical rhizome treatments and sprays for rhizome rot, scales, thrips, nematodes and leaf spots. Choose any 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 – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Turmeric – Transplants technology; plant protection, pp. 171–173

Region

Tamil Nadu

Last updated

2026-11-04

Chemicals: ask before you use

The source lists chemical rhizome treatments and drenches for soft rot, rhizome rot and leaf spot, and sprays for shoot borer and leaf roller. Choose any 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 – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Ginger – Seed treatment; plant protection, pp. 174–175

Region

Tamil Nadu

Last updated

2026-11-04

Pests: bio-intensive measures in the source

Citrus butterfly: collect and destroy larvae; Bacillus thuringiensis 1 g/l or neem oil 10 ml/l at new flush. Psyllids and leaf roller: yellow sticky traps (50/ha), a light trap (1/ha), releases of Trichogramma chilonis and Chrysoperla, NSKE 2.5% with mineral oil 0.25%, and border crops of sorghum or cowpea to keep natural enemies. Avoid sulphur sprays; a chemical leaf-spot spray is 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)), Curry Leaf – Plant protection (bio-intensive IPM), pp. 158–159

Region

Tamil Nadu

Last updated

2026-11-05

Nematodes, Panama wilt and Sigatoka: non-chemical measures

Nematodes: sow sunnhemp on the 45th day and incorporate it a month later; apply pressmud 15 t/ha and neem cake 1.5 t/ha one month after planting; intercrop marigold at 4:1. Pseudomonas fluorescens liquid formulation at 4 l/ha through drip at the 2nd, 4th and 6th month manages Panama wilt and nematodes. Panama wilt: uproot and destroy badly affected plants and apply 1–2 kg lime in the pit. Sigatoka leaf spot: remove affected leaves and burn them.

Source

Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Banana – Nematode; Panama disease; Sigatoka, pp. 11–12

Region

Tamil Nadu

Last updated

2026-11-04

Pests, diseases and hormones: ask before you spray

Remove loose bark at pruning to stop pests laying eggs. The source lists chemical sprays for flea beetles, nematodes, powdery mildew, downy mildew, anthracnose, rust and bacterial leaf spot, and a schedule of growth hormones (GA3 and others) for berry size. Hormone timing and dose are critical — for example, the source warns against GA3 in cloudy weather and from full bloom to fruit set. Choose any product only with your local Horticulture 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)), Grapes – Plant protection; quality improvement, pp. 24–27

Region

Tamil Nadu

Last updated

2026-11-04

Fruit fly and scales: non-chemical measures in the source

Fruit fly: collect fallen and infested fruits and bury them under a thick layer of soil; plough between trees to expose pupae; use methyl eugenol lure traps (25/ha); neem oil 30 ml/l is also listed. Scale insects: prune and burn affected parts. Chemical sprays for black leaf spot and powdery mildew 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)), Ber – Plant protection (pests), p. 40

Region

Tamil Nadu

Last updated

2026-11-05

Pests and diseases: ask before you spray

Yellowing of leaves has three main causes: iron deficiency, nematodes and root rot. The source lists chemical treatments for bud worm, blossom midge, red spider mite, nematodes, root rot and Alternaria leaf spot. It also lists Pseudomonas fluorescens: 25 g/m² to the soil and a 5 g/l foliar spray monthly after planting. Choose any chemical 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)), Malligai – Plant protection, pp. 250–251

Region

Tamil Nadu

Last updated

2026-11-05

Pests and diseases: ask before you spray

The source lists chemical sprays for thrips, aphids, leaf-eating caterpillars, root rot and leaf spot. 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)), Chrysanthemum – Plant protection, pp. 256–257

Region

Tamil Nadu

Last updated

2026-11-04

Diseases and disorders: non-chemical measures in the source

Bud rot: scoop out infected tissue and treat with Bordeaux paste; remove and destroy affected palms and bunches. Foot rot: isolate affected palms with trenches, cut and destroy severely affected palms, pull out stumps and improve drainage. Stem breaking: wrap the green part of the stem exposed to the south-west sun. Yellow leaf disease: balanced nutrients with extra superphosphate, 1 kg lime and 12 kg organic manure per palm per year. Nematodes: Pseudomonas fluorescens and Bacillus subtilis 10 g each. Chemical sprays for mites, spindle bug and leaf spot and Bordeaux drenches 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)), Arecanut – Plant protection, p. 224

Region

Tamil Nadu

Last updated

2026-11-05

Pests and diseases: non-chemical measures in the source

Mealybug: fish oil rosin soap 25 g/l and release of Cryptolaemus beetles (10 per tree). Pink disease: inspect trees in July–September and apply Bordeaux paste early; prune and burn dried branches. Brown root disease: open the roots and prune dead ones. Avoid rubber accumulating at the base of trees. Chemical and copper sprays for leaf fall, powdery mildew, leaf spots, bark canker and rots 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)), Rubber – Plant protection, pp. 210–211

Region

Tamil Nadu

Last updated

2026-11-05