Most of the single-season rice in Dongyang City will be eared in the middle and late August. It is a key period for the prevention and control of diseases and insect pests. Rice mainly contains rice planthoppers, rice leaf roller, sheath blight, and stem borer, etc. Emphasis on the trend. Rainy and sweltering weather should prevent the occurrence of rice smut, and mountainous and susceptible varieties should pay attention to rice blast disease. Pay attention to medication safety in hot weather.
First, the trend
1. The rice leaf roller: There are more five (3) generation rice leaf roller cockroaches, of which there is a peak on July 20th. The amount of mu is 196, and the highest is 490. On July 25, the average amount of mu was 62. It is predicted that five (3) generations of rice leaf curlers will appear to be overweight.
2. Rice planthoppers: Currently, the number of rice planthoppers per plant in the single-cropping rice field is 146 per hundred clusters, which is similar to the previous two years; the number of rice planthoppers has increased in recent days, with a small peak at July 26, 23 white backs, and brown planthoppers. 1 head. It is predicted that the weight of the five (3) generation brown planthoppers will occur.
3. Erhuaia spp.: The second generation of S. indica grows more seriously in single-season rice, the second generation S. indica is about 376 per mu, and the mixed-sector area reaches 1200. It is predicted that the third generation of S. indica is present in single-season rice. Moderately.
4. Sheath blight: A single-season rice field in Lizhai was investigated on July 25. The average strain rate was 6.5%, ranging from 2 to 27.0%. In recent days, high temperature and high humidity weather is conducive to the occurrence of sheath blight, has entered the surge period of illness, showing a tendency to occur in the middle.
5. Rice blast disease: The disease is mainly caused by Zhongzheyou No. 1 and Fengxiangyou No. 1. In mountain and semi-mountainous areas, the susceptible varieties need special attention to control rice blast.
Second, prevention advice
1. Single-season late rice: The first prevention and control was on August 15th, focusing on the prevention and control of 3 generations of S. japonica, concurrent treatment of brown planthopper, rice leaf roller, sheath blight, rice smut, etc., early break, early Control, pharmaceutical agents can choose 10% Avi flubendiamide 30 ml (or 40% chlormethaazide 10-12 g) + 25% buprofezin 100 g + 30% difenoconazole-propiconazole 30 ml (or 3% Jinggangmycin 300 ml). The second prevention and control will focus on the prevention and control of six (4) generation rice planthoppers from August 25 to August 31. It will also be used to treat the third generation of the after-peaks of the second crop, rice leaf roller, and sheath blight. During the break period, the main control measures include false smut disease, rice stem borer, rice leaf roller, and rice planthopper. The agent can be selected from 10% Avi-flubendiamide 30ml (or 20% chlorantraniliprole 10g) + 25% buprofezin 100 g (or 25% pymetrozine 30 g) + 30% difenoconazole-propiconazole 30 ml (or 3% Jinggangmycin 300 ml).
2. Continuous cropping of late rice: Focus on controlling five (3) generations of rice leaffolders from August 10th to 15th, treating both Saponaria and rice borers, and using 20% ​​chlorantraniliprole 10 g (or 40% chlorine) as the medicine. Thiamethoxam 10-12g) + 70% imidacloprid 6g, flush 45 kg spray. From August 25 to August 31, the main prevention and treatment of six (4) generation rice cultivars was mainly used to treat three generations of rice stem borer, rice leaf stalk leaf sheath blight, and sheath blight, and 10% of avermectin flubendiamide 30 was used as a pesticide. Milliliters (or 20% chlorantraniliprole 10 g) + 25% buprofezin 100 g (or 25% pymetrozine 30 g) + 30% difenoconazole-propiconazole 30 ml (or 3% Jinggang 300 ml), flush 60kg coarse spray.
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