Control of rice white-backed planthopper

Symptoms of damage: sucking juice at the base of rice plants inhabited by adults and nymphs, resulting in chlorosis and yellowing of leaf tips, serious withering of the whole plant, difficulty in heading, withered booting or brown panicles at panicle stage, and blighted grain.

Morphological characteristics: adults can be divided into two types: long wing type and short wing type. The long-winged adult is 4 '5mm long, grayish yellow, the top of the head is narrow, protruding in front of the compound eye, there are three protruding longitudinal ridges on the face, the ridge is light, the groove is dark, and the black and white is distinct. There is a pentagonal white or blue-white spot in the center of the small shield plate on the chest and back. The female is dark brown or grayish brown on both sides, while the male is black and connected at the front end. The wings are translucent, and there is a black spot in the center of the rendezvous line. The short-winged female is about 4 mm long, grayish yellow to yellowish, and has short wings, only half the size of the abdomen. The egg tip is pepper-shaped, thin, slightly curved, about 0.8 mm long, milky white at birth, and then yellowish, with 2 red eye spots. The eggs are laid in the leaf sheath called the middle rib and other tissues, the eggs are arranged in a single row into blocks, and the egg cap is not exposed. The nymph is nearly fusiform about 2.7 mm, milky white at first hatching, with gray spots, and then light yellow, with grayish brown or grayish cyan markings on the back.

Prevention and control methods:

1. Agricultural control: select insect-resistant rice varieties and carry out scientific fertilizer and water management to create ecological conditions that are not conducive to the breeding of white-backed planthopper.

2. Biological control: there are many species of parasitic and predatory natural enemies in each stage of white-backed planthopper, in addition to parasitoids, black-shouldered green bug bugs, ladybugs, spiders, nematodes and fungi have great inhibitory effects on the occurrence of white-backed planthoppers. The protection and utilization of natural enemies can have an obvious effect on controlling the occurrence of white-backed planthopper.

3. Chemical control: according to the types of rice varieties and the occurrence of planthoppers, key control measures were taken to control the peak period of young nymphs in the main damage generation, if the number of adults was particularly large and concentrated in years and areas, the combination of prevention and control of immigrant adults and the peak period of young nymphs in the main damage generation was adopted. Use 58% rice insects to kill 100 grams (1 pack) and spray 50 kilograms of water per mu.