(a) Emamectin benzoate 5 SG 5 g in 10 litres of water area spraying any one of the following insecticides from 4 weeks onwards is recommended. If the number of seedlings damaged by Spodoptera exceeds 6 per sq.m. kurstaki 1.0 kg in 1125 litres of water per hectare controls the pest. Spraying 50 litres of 1% NSKS on 3 week old seedlings and 60 litres of 2% NSKS on 4 week old seedlings or 1125 litres of nuclear polyhedrosis virus (NPV) solution prepared by 250 NPV infected larva by mixing with 250 g rice powder or starch powder during evening times or Bacillus thuringiensis var. This suspension can be directly sprayed on tobacco seedlings.įor preparing 2% NSKS of 10 litres, 200 gm of neem seed kernel powder is to be taken and prepared as above. The bag is dipped in a bucket (or any vessel) containing 10 litres of water and the bag is squeezed for 15 minutes to obtain a light brownish liquid. If the catch of male Spodoptera moths is more than 5 per trap 1 % neem seed kernel suspension (NSKS) in water on 3 week old seedlings and 2% NSKS on 4 week old seedlings is to be sprayed.įor preparing 10 litres of 1% NSKS 100 gm of neem seed kernel powder is taken and placed in a small muslin cloth bag. Leaves having egg masses and tiny caterpillars are clipped and destroyed.įour `litlure' pheromone traps are installed (loaded with 2.5 mg pheromone per vial) per acre two weeks after germination. The castor seedlings attract female moths of Spodoptera for egg laying. Sowing of Castor around tobacco nursery 15 days before sowing of tobacco so that the castor puts up sufficient foliage by the time Spodoptera infestation builds up. There will be about 80 to 100% loss due to this pest.ĭeep ploughing of nursery area during April-May will facilitate the exposure of pupae to high temperature and thus destroy them. They feed voraciously along the veins of leaves and also cut the stems of small and tender seedlings. The well grown caterpillars are grey or dark brown with `V' shaped white mark on the front portion of the black head. The young caterpillars are light green with black head or black spots and mine on the leaf tissues. Tobacco Caterpillar : Spodoptera litura F commonly known as tobacco caterpillar is the most important pest. (1) Caterpillars and Cut-worms (2) Stem borer and (3) Whiteflyįour species of Caterpillars viz., Spodoptera litura F., Laphygma exigua HB., Agrotis ypsilon Rott. MANAGEMENT OF INSECT PESTS Pests in tobacco nursery
0 kommentar(er)
