Locust: picking and treating seedlings

Recently, with the recovery of temperatures in major wheat regions in China, wheat production in the main producing areas has begun to enter the greening and jointing stage. In addition, this year's drought has resulted in poor wheat seedlings and weak resistance in some wheat regions in China, and is more vulnerable to insect pests. The occurrence of aphid and other hilarious pests has become more serious. The locusts have developed serious ecological potential and the situation is severe. Development of ecological potential: According to the National Conference on Wheat Pest Control and Prevention held in Shiyan, Hubei Province from March 28 to March 2011, wheat bran is moderate in the southwestern wheat region of China, and Huanghuai, Jianghuai, and the southern wheat region of North China are Emphasis was placed on the occurrence of high levels of insects in Henan, southern Shanxi, and Shandong Jiaodong Peninsula. The situation in each region is as follows: Southwestern Wheat Region: The current wheat aphids are commonly found in Yunnan, Guizhou, Sichuan, and Chongqing. The average number of strains is 65-215, and the highest is 395. The overall occurrence is lighter. It is expected that the moderate and local areas will be emphasized in 2011. Jianghuai wheat area: Wheat aphids generally occur in the Jianghuai area, but occur less frequently. One hundred strains of maggots have 5-60 heads and some areas have 130-470 heads. It is expected that a moderate bias will occur in 2011. Huanghuai Haimai District: Emphasis on occurrence in Henan Province, generally 100 strains of 50-100 maggots, and up to 500 in Nanyang; Shandong Province has a high number of worms, and Weihai has a maximum of 246 maggots; Shanxi medlars are also widespread. occur. It is expected that 2011 will be more or less serious. Northwest Wheat Region: Wheat locusts in Shaanxi and Gansu Province were lighter than the same period of last year. It is predicted that the occurrence of wheat aphid in 2011 will be moderate, with local bias occurring. Control strategies and methods: Divided into two stages of hazards, seedlings and panicles, should adopt the strategy of picking shoots and treating panicle blasts. When the amount of 100 pods in the field reaches 500 and the hazard ratio is greater than 1 :500, use 50 ml of 25% sulphate per mu, or 1500-2000 times spray of imidacloprid, and 10% of scorpion 60- 70 grams; 20% of imidacloprid 2500 times; 25% of anti-influx 3000 times spray control. Wheat buckwheat is not suitable for single use of pesticides in wheat fields resistant to imidacloprid and acetamiprid, and can be reasonably mixed with low-toxic organophosphorus pesticides. Problems that should be paid attention: This year, due to the generally low temperature in the early period, the population of wheat aphids is increasing in many places. If the temperature does not increase sharply in April and May and there is no heavy rainstorm, it will be beneficial to the outbreak of wheat aphid. For the prevention and treatment of wheat in the prevention and control indicators to be timely. For wheat aphids, the southwestern wheat areas such as Yunnan and Sichuan have already entered the panicle stage, and prevention and treatment of severely met prevention and control targets must be carried out in a timely manner. For other winter wheat areas, monitoring must be strengthened.

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