The annual occurrence of pear wood mulberry in the pear area is extensive, and the damage is severe. Nearly 1/4 of the pear trees in our province have suffered from the adverse effects of early defoliation, declining tree vigor, and declining quality of fruit due to its harm, directly affecting the production of pear fruit. Since the avermectin was used to control pear hibiscus in the 1990s, the harm of hibiscus was basically controlled.

The prevention and treatment of the first generation of pear hibiscus this year was not as effective as in previous years. The reasons are as follows:

First, the fruit growers do not attach importance to the work of clearing the gardens in winter, and the farmers who use lime sulfur mixture are reduced. The second is that the overall output of pear wood pupa is earlier than in previous years. The third reason is that the climatic conditions caused the raspberry to go out of order. Before the flowering of the pear tree, 10% to 15% of hatched eggs and about 10% of overwintering adults are present. The first generation of pear wood has severe overlapping overlapping generations. Adults, nymphs and eggs are present at the same time. (Loss 70% to 80%) A large amount of mucus has appeared. Fourth, some fruit growers missed the best prevention time. After investigations in Zhaoxian County, Xinji County, and Suning County, and fruit growers, the orchards applied around April 20 were better than those applied after April 25th. Fifth, the problem of avermectin resistance. The application of avermectin to pear trees has been in use for nearly 20 years. The use of 1.8% avermectin has declined from the initial 6000-8000 times to the present 1500-fold. Sixthly, the quality of avermectin in the market is uneven, and some manufacturers cannot guarantee their efficacy in pursuit of profits. Seventh, different species of pear trees occur, and the degree of occurrence of pear trees is also different. For example, Crown Pear's leaves are dense and difficult to spray when applied. Therefore, the incidence of P. crassifolia is heavier than that of Sydney and Yali pear.

According to the occurrence characteristics of this year's pear hibiscus and the above reasons, it is recommended that the following measures be taken in the prevention and control of pear hibiscus:

1. Can not give up the traditional method of stone sulfur mixture control. The use of pyrethroids (such as tripod, etc.) and avermectins (such as Influenza, 4A, Shi Guangda, etc.) can be prevented before flowering.

2. The first generation pear pear lice prevention. About 80% of pears fall, and it is a critical period for pesticide application. It is recommended to use quality guaranteed avermectin, such as worms full of 1200 to 1500 times or 4A3000 times or 3,000 times or 3000 times solution of light or Ding Gong or poisonous high-emulsion spray. To achieve uniform, detailed, shower spray, it is best to mix with special additives for cracking pear muddy mucilage. For an orchard whose pear pods were more than 10% after flowering, or if the pear groves were severe in previous years, they should be sprayed for 6 days after the first dose after anthesis, to avoid the disaster of pear hibiscus before bagging or fruit thinning.

3. The prevention and control of the first generation pear beetle adults. The adult and pear nymphs occur at the same time. It is recommended to use the drug: worms full of 1200 to 1500 times or 4A3000 times or 3,000 times or 3000 times and 20% of high emulsions 1000 to 1500 times + 5000 times the net. Liquid spray, can prevent Kang's whitefly. To achieve uniform, detailed, shower spray, it is best to mix with special additives for cracking pear muddy mucilage.

4. The second generation of pear lice nymphs prevention and treatment. According to the pest situation in the past two years, it is expected that the second generation pear nymph larvae hatching in Shijiazhuang, Hengshui, Quzhou and other places from the end of May to early June, the recommended drug: insect full venom 1500 times or 4A3000 times or refining 3000 times liquid or application of light up 3000 times liquid + net 5000 times liquid +20% poisonous high emulsifiable concentrate 1000 ~ 1500 times liquid, can treat green-blind phlegm, yellow pupa and various fleas.

5. It is recommended to prevent and treat once a month thereafter. After that, the prevention and treatment of pear hibiscus in each period is basically the same as the traditional prevention and treatment. At the same time, various localities should also formulate corresponding prevention and control measures based on the actual situation of the occurrence of pear hibiscus.

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