Jiang Nong butterfly control

1. Morphological characteristics of adults: black-brown body wings, forewings with five gray-and-white spots, larger spots below the middle chamber. There is a big white spot in the middle of the rear wing. The egg is hemispherical, the top is flat, and the contact with the leaf surface is in the shape of a hat brim, slightly wrinkled, and there are more than 50 raised fine lines on the side. After the 3rd instar, two crescent-shaped maculae appeared on both sides of the sixth dorsal line of the abdomen, and the valves were white. The pupa is long spindle-shaped, yellowish green, covered with white wax powder.

two。 Life habits and occurrence regularity

Ginger butterflies occur for 3 or 4 generations a year, overwintering as pupae in grass or dead leaves. Eclosion and spawning in the first ten days of April of the following year. The larvae began to cause damage in the middle of May, and the damage was the most serious from July to August. The female ginger butterfly lays eggs on the back of the leaves, and each female can produce 20 eggs and 34 eggs. After hatching, the larvae climb to the edge of the leaves and spit out silk to fix the leaves. After the 3rd instar, the leaves can be rolled into a cylindrical leaf bud and transformed into plants sooner or later. The mature larvae pupate on the back of the leaves.

3. Prevention and cure method

(1) Clean the garden field: after ginger harvest, clean the false stems and leaves in time, burn or rett to make fertilizer, in order to reduce the source of insects.

(2) disinfestation: artificial removal of insect buds.

(3) Pesticide control: spray control of larvae at low instar, it can be sprayed with 2000 times of 25% quinathion EC or 20% fenvalerate EC, which has better effect.