Crop Protection

Insect – Pest management in 15-20 days old soybean crop

20 July 2022, New Delhi: In an advisory issued by the Indian Institute of Soybean Research, Indore, farmers whose soybean crop is about 15-20 days old, may see pests in his crop. The farmer needs to identify these pests and use the right method/agro chemicals to control these pests.

Leaf Eating Caterpillar

Indian Soybean Research Institute, Indore has advised farmers to visit their soybean field to check for the presence of the pest. The institute has advised the farmers to use Chlorantraniliprole 18.5 SC @ 150 ml/ha for control of leaf eating pest. This will help in controlling the leaf-eating pest for the next 30 days.

Stem Fly

Stem fly infestation in soybean crop has been reported in some areas. Indian Soybean Research Institute has advised the farmers to spray premix formulation of Thiamethoxam 12.60% + Lambda-Cyhalothrin 09.50% ZC (125 ml/ha) for its control.

Tobacco Caterpillars

Outbreaks of tobacco caterpillars have been reported in some areas. For its control, it is recommended to spray any one of the following insecticides. It also kills other leaf-eating caterpillars (gram worm or semi-looper). To control this, the institute has advised the use of agrochemicals as follows.

Lambda-cyhalothrin 4.90 SC (300 ml/ha) or Quinalphos 25 EC (1 l/ha) or Chlorantraniliprole 18.5 SC (150 ml/ha) Emamectin Benzoate 1.90 (425 ml/ha) or Broflanilide 300 SC (42-62 g/ha) O) or Flubendiamide 20 WG (250-300 g/ha) or Flubendiamide 39.35 SC (150 ml/ha) or Indoxacarb 15.8 SC (333 ml/ha) or Profenofos 50 EC (1 l/ha) or Spinetoram 11.7 SC (450 ml) / ha) or Tetraniliprole 18.18 SC (250-300 ml / ha).

Control of Rhizoctonia Aerial Blight

Infections of Rhizoctonia aerial blight have been reported in some areas. Farmers are advised to spray Hexaconazole 5 EC (1 ml/Lit of water) on the crop.

Symptoms of Rhizoctonia aerial blight on plant

  1. Infected seeds have irregularly shaped tan or light brown sunken lesions.
  2. Infected leaves appears as water soaked at first instance. They soon take on a greenish brown to reddish brown appearance.
  3. The infected portion later turns tan brown or black in colour.
  4. Under high rainfall or high humid conditions, a web like mycelial growth of fungus forms on the leaves.
  5. Dark brown sclerotia are formed on leaves.

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