Problems and countermeasures in the control of wheat aphid
Problem 1: Some farmers do not control wheat aphids according to the control index, but control them after the wheat aphids are full of ears, which not only causes harm to@#@245 @#@, but also affects the control effect.
The control index of wheat aphid is 500 aphids per hundred ears. The plots that reach the control index should be treated immediately.
Question 2: If the pesticide is not updated, the wheat aphid will be resistant to the pesticides used, and the control effect is very poor.
At the early stage of aphid occurrence, spray 3% acetamiprid EC 2500~3000 times per mu, or spray 10% imidacloprid WP 1500~2000 times or 50% pirimicarb WP 1500 times at the middle and late stage of aphid occurrence. The above chemicals have special effects on aphids and are basically harmless to aphids natural enemies.
Question 3: The amount of liquid medicine is too small. Most farmers add the pesticide for controlling wheat aphids in 1 mu of land to 1 sprayer water (a backpack sprayer contains about 15 kg of water) for prevention and control. Due to the large amount of seedlings in the late stage of wheat, it is difficult to spray the liquid medicine of 1 sprayer evenly on all plants in the wheat field, causing aphids to continue to survive and reproduce on the plants without medicine. After a few days, the population density of wheat aphids rises and harms wheat again.
The amount of solution per mu shall not be less than 45 kg, that is, 3 sprayers of solution. Spray evenly and thoroughly.
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Xiang Mai 969
Xiangmai 969 was bred by Xiangcheng City Agricultural Science Research Institute. Approval number: Yu Shen Mai 2006018. 1. Characteristics: Mai969 is a weak spring, multi-panicle, mid-early maturing variety. Spring jointing fast, plant height of about 70 cm, good stem elasticity, plant type compact, ear layer neat. Panicle rectangular, long awn, white shell, white grain; seed oval, medium to large, plump degree is good. 2. The results of comprehensive resistance identification by Institute of Plant Protection, Provincial Academy of Agricultural Sciences from 2004 to 2006
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What is the reason for the delay in tillering of small rice seedlings
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