At present, most of the late rice in Nanning is in the filling stage and maturity stage, and some early planting plots have begun to be harvested. Since October 13, a number of pest detection lights in Nanning City have monitored the peak of obvious rice planthopper migration, and the number of single-day insects in a single day on October 14 in various places is: 1063 in Hengzhou City, 223 in Shanglin County, 109 in Wuming District, 24 in Mashan County, and 41 in Binyang County, mainly brown planthoppers. The field investigation found that the seventh generation of rice planthoppers had accumulated outbreaks in local fields, with low insect population density of 0 heads/100 bushes, general 400-500 heads/100 bushes, and individual plots as high as 4000-6000 heads/100 bushes, mainly brown planthoppers. The seventh-generation rice planthopper in the city showed a light local moderate occurrence, with an area of about 50,000 mu, and the moderately occurring fields were mainly concentrated in the non-control fields, partial nitrogen fertilizer fields and poor drainage fields.
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In order to effectively do a good job in the prevention and control of the current seventh-generation rice planthopper and reduce the loss of late rice, the following technical guidance is put forward.
Key points of prevention and control technology
First, the mature late rice should be harvested immediately to avoid losses caused by rice planthoppers.
Second, late rice from the harvest period of more than 15 days of the field, can be selected trifluoropyrimidine, dimidoxamin and other agents with water spray, the water consumption per mu is required to reach more than 60 kg, the field is best to maintain a shallow water layer.
3. For fields of late rice that are more than 7 days away from the harvest period and less than 15 days, the following prevention and control methods shall be selected:
(1) The use of poisonous soil method in the field with shallow water layer, that is, 250 ml of 80% dichlorvos emulsifiable concentrate per mu is added to 3 kg of water, evenly sprayed on 50 kg of fine soil, and sprinkled into the paddy field in the afternoon when the sun is about to go down for half an hour.
(2) The use of water-splashing method or open row compartment spraying method in the field aquiferous layer, that is, use 250 ml of 80% dichlorvos emulsifiable concentrate + 250 ml of 20% isoprocarb emulsifiable concentrate mixed with more than 75 kg of water per mu to splash in the field, or first divide the rice in the field into 10-12 rows, and then spray the liquid medicine on the lower part of the rice from both sides of the box.
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Source: Nanning Plant Protection Station
Author: Chen Siyu
Editor: Nanning Agricultural Information Center
Legal Counsel Unit: Guangxi Fayan Law Firm
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