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Seize the risk of growth and control of the three growth warts, anthills, crawling on the plant after the ant spread, or crawl along the leaves to the base of the stem, bite hole into the rice stem; or climb to the tip of the silk drooping, with The wind drifts to the adjacent rice plant; it falls on the surface of the water and then swims on the rice plant, and bites into the hole. It took only 29 to 40 minutes from the hatching to the infestation. The infestation, survival, and damage of ants are closely related to the growth period of rice. Seedlings of seedlings are tightly wrapped in leaf sheaths, and the spacing of veins is less than the width of the ant's head. It is necessary to bite through the vascular bundles to invade. Therefore, it is difficult and the invasive rate is low; the leaf sheaths are tightly wrapped during the jointing stage; after heading, the tissues are tight and the ants are crippled. It's harder to break in, so it's less damaging. In the rice tillering stage, the rice tissues are tender, the leaf sheaths are loose, the sheaths and veins are wide, and the ants are easy to invade; during rice booting, only one layer of leaf sheaths is wrapped, and the anthills are also easily invaded, especially when the flag leaf sheath cracks and exposes the ear. The ant colony enters a favorable period of invasion. Therefore, rice tiller period, booting to the beginning of the break is the risk of growth of larvae of S. rapae. In the late rice delivery period, the density of field egg masses of 40 blocks per mu was defined as the field of control. The prevention and control measures during the peak period of incubation are: In the period of 2~3 days after the peak period of codling moth under the lamp, 50 strains of ovum strains were taken from various types of fields and were gradually moved to various types of Tiantianjiao, and the hatching progress was checked on a daily basis. When half of the egg mass hatched, it was the peak of hatching, and it was applied in 1 to 2 days. From booting to heading, in the ovum egg-filling period, late rice paddies (booting period) exceed 10%, or heading less than 80% of the plot, should be classified as a field of control. The leaf blade sheath cracking and breaking the spikes are the key moments for prevention and treatment of S. sinensis, and 5% to 10% of the rice plants should be treated when they break open. The late rice that has been eared before the hatching of eggs and has not yet reached full heading must be used once when the quail eggs begin to hatch.
Seize the leaf sheath in the prevention and control period of the larvae of the anthill. After hatching, generally, the rice leaf crawls down or droops down from the rice leaf, invades from the leaf sheath, and gathers in the leaf for a period of time. The dry sheath appeared on the 9th to 13th days after the anthill hatching, and the dry heart strain appeared on the 15th to 19th days after the larvae hatched. Therefore, it is more appropriate to control the use of drugs during the peak period of the dry sheath of late rice. Too late to prevent the larvae from spreading into the stalk is poor. Prevention and control indicators: In the tillering period, the dry sheath rate was 5% to 8%, while in the panicle stage, 300 to 500 per mu of the above-mentioned debris were the control object fields.
The use of new counter-pesticides for prevention and control of stem borer and rice stem borer can be used to spray 50 to 40 milliliters of 5% virgin suspension concentrate on 50 kilograms of water; for the control of rice stem borer, 1.8% of ivermella can also be used. Emulsifiable concentrate 2500-3000 times, spray evenly.
Late rice borers must be controlled in two critical periods
Late-stage rice borers are harmed, which is what the farmer friends call “sinus wormsâ€, mainly stem borer, and secondly stem borer. In order to improve the effectiveness of prevention and control, we must seize the key period and hit the "essence" of locusts.