The scientific name is Udaspes folus Cramer, Lepidoptera. Alias ​​silver spot ginger butterfly. The distribution ranges from Henan in the north to Taiwan, Hainan, Guangdong, Guangxi, and Yunnan in the south.
The host is ginger, ginger flower, wild ginger and other ginger plants.
The characteristics of larvae are larvae. The leaves of the larvae become sticky, and the larvae hide their feedings. The injured leaves are nicked or cut off at 1/3. In severe cases, only the petioles are left.
Morphological characteristics Adult body length 18-22mm, wingspan 32-44mm. Body, wings dark brown. The forewings have five gray-white spots and the spots located below the middle chamber are larger. There is a large white spot in the center of the hind wings. The egg is 0.8mm long, hemispherical, and the top is flat. The leaf is in contact with the leaf surface. It has a hat-like shape, slightly wrinkled, and more than 50 raised lines on the side. The last instar larvae are 35-45mm long with green grass. After 3rd instar, two nearly half moon-shaped maculas appeared on both sides of the abdomen's sixth section, and the valves were white. The dragonfly is 35-46mm long, spindle-shaped, yellow-green, and white wax powder.
Habits of life 3-4 generations in Guangdong, in order to spend the winter in the grass or dead leaves. In late spring, early spring eclosion occurs and spawns. The larvae began to damage in mid-May, and the most severe damage occurred in July-August. Females spawn eggs on the back of the leaves, and each woman can produce 20 to 34 grains. After hatching, the larvae climbed to the margin of the leaves and turned their leaves into leaves. After the 3rd instar, the leaves could be rolled into tube-shaped leafhoppers and damaged in the early and late stages. Mature larvae phlegm in leaves. Egg period 4-11 days; larval period 14-20 days, a total of 5 instar; puerperium 6-12 days; adult life span of 10-15 days.
Prevention methods (1) After ginger is harvested, remove pseudo stems and leaves in time and burn or crush fertilizers to reduce the source of insects. (2) Artificially remove insects. (3) In the larval stage, 25% ikasei 800-1000 times solution or 20% cypermethrin emulsion 2000 times solution can be used. The effect is better.
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