the major pests of soyabean and their managementpptx

the document provide major pest of soyabean like griddle beetle.

1. Girdle beetle   S.N. :- Oberea ( Obereopsis ) brevis Family:- Cerambycidae Order:- Coleoptera Distribution:- This is more common in M.P, Rajasthan and West Bengal. Its first occurrence was seen in M.P . Host ranges:- Soyabean , pigeon pea, black gram, green gram, sunflower, etc

2. Marks of identification Larva:  White, soft-bodied worm with a dark head. Adult: The freshly emerged adult is yellow, red, brown on the head, thorax and bases of elytra. The adult beetle is characterized by its yellow-red head and chest coloration, and brown colored bases of elytra (wing covers ). The eggs are laid in between girdles by the females. Larvae will bore into stem and feed on the inside, forming a tunnel in the stem.

3. Nature of damage The incidence of girdle beetles is observed at the seedling stage. The presence of 2 circular cuts on the branch or stem is a characteristic symptom. Larvae bore into the stem of soybean. The inside of the stem is eaten by the larvae, forming tunnels within the stem. The infected portion above the circular cut is unable to get any nutrition so it dries up. In the later stages of infestation, the plant is severed at about 15 to 25 cm above the ground . The main damage is caused by the larvae of the insect. The attack of the insect initially begins in the last week of July to the first fortnight of August. The insect remains active from July to October, damaging the crop most severely during August and September. Heavy incidence may reduce the yield by up to 40%.

4. Symptoms of damage Girdling of  stems and petioles The inside of the stem is eaten by the larvae and a tunnel is formed inside the stem. The leaves of plant of infected portion are unable to get the nutrient and are dried up. In later stages the plant is cut at about 15 to 25 cm above the ground.