Economic threshold levels for green gram: aphids – 20 per 2.5 cm shoot length; pod borers – 10% of pods affected; spotted pod borer – 3 per plant; stem fly – 10% of plants affected; tobacco cutworm – 8 egg masses per 100 m.
Pending expert review
Source
Crop Production Guide – Agriculture 2020 (Directorate of Agriculture, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Greengram – Crop protection, ETL, p. 148
Region
Tamil Nadu
Last updated
2026-11-04
Caterpillars and pod borers: non-chemical measures
Use light traps to monitor and kill adult moths. Set up sex pheromone traps at 12 per hectare to monitor the pest. Grow castor along the border and irrigation bunds. Remove and destroy egg masses in castor and cotton, and early-stage larvae found in clusters. Collect and destroy shed plant parts, and hand-pick and destroy grown-up caterpillars.
Pending expert review
Source
Crop Production Guide – Agriculture 2020 (Directorate of Agriculture, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Greengram – Pest management strategies, p. 149
Region
Tamil Nadu
Last updated
2026-11-04
Powdery mildew, rust and yellow mosaic: non-chemical measures
Powdery mildew: spray NSKE 5% or neem oil 3% twice at a 10-day interval from the first symptoms. Rust: spray 10% eucalyptus leaf extract when the disease starts and 10 days later. Yellow mosaic (spread by whitefly): install yellow sticky traps at 12 per hectare, rogue out virus-infected plants up to 45 days, and spray 10% notchi leaf extract at 30 days or a neem formulation at 3 ml per litre.
Pending expert review
Source
Crop Production Guide – Agriculture 2020 (Directorate of Agriculture, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Greengram – Disease management (Powdery mildew, rust, yellow mosaic), pp. 149–150
Region
Tamil Nadu
Last updated
2026-11-04
Root rot
Apply zinc sulphate at 25 kg/ha and neem cake at 150 kg/ha basally. Apply Pseudomonas fluorescens or Trichoderma asperellum at 2.5 kg/ha with 50 kg of well-decomposed FYM or sand to the soil at 30 days after sowing.
Pending expert review
Source
Crop Production Guide – Agriculture 2020 (Directorate of Agriculture, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Greengram – Disease management (Root rot), p. 150
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.
Pending expert review
Source
Crop Production Guide – Agriculture 2020 (Directorate of Agriculture, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Greengram – Pest & disease management, pp. 148–150
