Rice green planthopper

Scientific name Homoptera, Planthopidae. Distribution in the south and north Zizania latifolia, rice cultivation areas.

Host rice, Zizania latifolia, Zizania latifolia, etc.

The damage characteristics are that the adult and nymph prick the rice juice, the injured leaves appear yellow-white to light brown or brown spots, the later leaves gradually turn yellow and dry from the tip of the leaves to the base, the excreta cover the leaves to form coal pollution, the female insect oviposition marks initially show water stains, then secrete white velvety wax powder, after the wound appears, the plants wither in groups and die in pieces.

Morphological characteristics Male adult body length 5 - 6.1mm, female 5.7 - 7mm, slender, light green body, compound eyes, black or reddish brown; head protruding in front of the compound eye, slender, conical, singing end and rear tibial distance teeth black-brown. The length of the whole mesothorax is equal to the sum of the top of the head and the prothorax. The female external genitalia often secrete white velvety wax powder. Male spores slender, sword-shaped. The egg is 0.7 - 1mm long, banana-shaped, translucent, milky white to grayish yellow. The nymph has 5 instars. It is milky white and slightly transparent at the beginning. After 1 instar, it has wax powder. Five wax filaments like white velvet are pulled out from the ventral end. There are no wing buds in the 1st and 2nd instars. After 3 instars, the body turns green. The front wing buds in the 4th instar are shorter than or close to the rear wing buds. The front wing buds in the 5th instar completely cover the rear wing buds.

Life habits Jilin 3 generations, Jiangsu, Jiangxi, Zhejiang, Hubei, Shanghai

The diapause eggs overwintered in leaf veins, leaf sheaths or dead leaves of hosts such as autumn and wild Yingbai. Hubei overwintering eggs began to hatch in the first and middle of April, entered the peak period from late April to early May, and began to appear adults in early June. The first generation occurred from early June to late July, the second generation from early July to early September, and the third generation from mid-August to mid-October. The overwintering egg period is 6 - 8 months, the first generation is 22 - 26℃, the egg period is 10 - 12 days, the nymph period is 15 - 22℃, 26 - 38 days, the oviposition period is 9 - 25 days, the oviposition begins 2 - 3 days later, and the adult life span is 3 - 7 days. Natural enemies are parasitic wasps, spiders, lacewings, ladybugs, frogs and so on.

Control methods (1) The number of overwintering eggs was investigated in March. (2)Fire dead leaves of rice or cut them completely before hatching eggs in February, and thoroughly remove weeds in ponds and ditches of farmland. (3)spray 2500 times of 10% pyrimethrin WP or 30% acephate EC, 1000 times of 50% fenitrothion EC, 2000 times of 20% buprofezin EC, 20ml of 5% Regent Collosol per 667 m2 or 90% Shachongdan original powder per 667 m2 50 - 60g of water spray, 20% fenvalerate or 2.5% deltamethrin EC per 667 m2 Adding 0.2% neutral detergent to the solution can improve the control effect. 75% Shibote WP 650g/m2 can also be used to control rice planthopper, rice stem borer, rice leaf roller. In addition, spraying 2% Yechan powder is also effective per 667m22kg.