Dandong Donggang City 2008 rice plant fly will recur
1. Forecast basis 1.1 The field insect population was higher than the plant protection station follow-up survey. In winter in our region, the occurrence of slugs in the field was rapid. On June 26th, the field insect density was about 100 heads per hundred. Due to the frequent blasts in the summer, the adults of the rice planthoppers in the south also moved in. In the end of June, the amount of insects in the fields reached about 1,500 points. After two weeks of careful prevention and control, a good control effect was obtained. However, on July 15th, there were still a few cases where the control of the plots was not thorough enough, and the insect density was still relatively high. At present, the field insect density is still on the rise. On July 23, the plant protection station investigated in areas such as May 4th, Qianyang, Changshan, Peizizi, chair circles, and loess ridges. The number of Baixue 2,000 or more, the average of more than 1,000 Cubs were all instar nymphs, which was more than 4 times more than the moderate occurrence of 250 in the same period in 2007. Individual plots have reached the level of prevention and control indicators (average 2000-3000). 1.2 Meteorological conditions are conducive to the occurrence of the current positive rainy season, and there is a stormy process in early August. The amount of insects in the south will also gradually move in, and the amount of insects in the field will continue to increase. 2. Prevention opinion 2.1 It is necessary to attach great importance to the occurrence of rice planthoppers in this period in addition to the possibility of continuing virus transmission and the occurrence of rice stripe disease, which is mainly caused by direct damage to rice. At present, rice has entered the period of spikelet differentiation, and damaging rice will directly affect yield. The leaders of the towns (districts and districts) should be given due attention; the agro-technical service centers must conduct thorough investigations and guidance in the field, and should do a good job of the unified defense work according to the base number of insects in specific plots. 2.2 The prevention and treatment time from now until August 5 is the best time for prevention and treatment. It is hoped that the majority of farmers will seize the time to prevent and control them completely and leave no dead ends. 2.3 Application of pharmaceutical agents may be used to control rice planthoppers, such as imidacloprid, buprofezin (Pentazolone), chlorpyrifos, fipronil, Aketai, dichlorvos and so on. In order to improve the efficacy of the pesticide, simultaneous control of pests such as rice leaf roller, leaf borer, armyworm, and rice borer promotes the use of more than two kinds of drugs, such as chlorpyrifos plus dichlorvos, fluchlorfen plus dichlorvos, imidacloprid plus dichlorvos, etc. Prevention and control effect. While preventing rice planthoppers, it is recommended to increase antiviral agents. Such as Ningnanmycin, virus A, anti-virus abundance. Dandong Donggang Regional Monitoring Station Positive Pressure Yibin Tianruida Auto Parts Co.,Ltd , https://www.trdautoparts.com