30,000 hectares of winter-spring rice must be sprayed a second time to prevent and control small leaf rollers.
Monday, August 28, 2023 | 09:00:36
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According to the Department of Agriculture and Rural Development, from August 20 to 24, localities in the province organized spraying of pesticides to prevent and control small leaf rollers and some other pests for 97% of the winter-spring rice area.
Farmers in Tien Hai district spray insecticide on rice.
However, the density of small leaf rollers in this year's crop is too high. In areas and localities where prevention and control do not ensure the "4 rights" principle, and use pesticides not recommended by professional agencies, the density of surviving worms is 50 - 100 individuals/ m2 , especially in areas that have not been sprayed with pesticides, the density of surviving worms is very high, from 200 - 500 individuals/ m2 .
This amount of worms will seriously damage the flag leaves and functional leaves of the rice crop, leading to serious yield reduction and crop failure if not sprayed promptly.
The agricultural sector has requested localities to urge and guide farmers to inspect their fields. Rice fields with a density of 20 leaf rollers/ m2 or more must be sprayed for the second time. It is estimated that the area requiring the second spraying of leaf rollers in the whole province is about 30,000 hectares. The second control period is from August 26 to 29. In addition, rice fields that flower in early September need to be sprayed for two-spotted stem borers, and sprayed to prevent rice blast, bacterial leaf blight, and bacterial streak if the weather is cloudy and the rain lasts for a long time.
Ngan Huyen
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