The occurrence and prevalence of rice pests and diseases in Jiangsu rainy weather

In August, the temperature in Jiangsu Province was high, the precipitation process was frequent, and the rainy days were high; the hot and rainy weather was conducive to the occurrence and prevalence of rice pests and diseases. At the same time, affected by multiple typhoons, the supplementation of the “two-shift” pests was very favorable. In addition, the local insect source was greatly feathered. The number of adults of brown planthopper and rice leaf roller was significantly increased in the area south of the Huaihe River, which was significantly increased compared with the same period of last year. In the same period of 2005, the late-maturing varieties and the growing green rice pose a greater threat.

According to the recent survey data on pests and diseases provided by Jiangsu Plant Protection Station, rice diseases in the province are mainly sheath blight, rice blast and rice smut. The main pests are brown planthopper and rice leaf roller. Among them, the rate of diseased plants in hilly, Lixiahe and Huaibei areas is 20-70%, and the rate of strains in southern Jiangsu and Yanjiang is 3-10%. The susceptible areas of rice blast are mainly in hilly, coastal, Huaihe and Huaibei areas. The source of bacteria in the field is sufficient; the source base of rice smut is relatively large. At present, the diseased granules have appeared on the hybrid japonica rice in some areas.

Sheath blight, rice smut, rice blast is a typical climatic disease. The rice heading stage is the most invasive stage of rice blast fungus. If there is precipitation and cooling, the weather will increase; the rainy and irritating weather is easy to induce. And increase the incidence of sheath blight and rice smut.

It is expected that in the first rainy weather in Jiangsu Province in early September, the temperature will drop. On the 4th to 5th, there were showers or thunderstorms along the Yangtze River and the southern part of the Yangtze River. The southeastern part of the province was rainy; on the 6th to the 7th, there was a shower or thunderstorm in the south of the Huaihe River; on the 9th, there was a precipitation process between the Jianghuai and Huaibei areas. . At this time, the japonica rice enters the breakage stage, and the rainy weather is conducive to the development of rice pests and diseases. Therefore, it is recommended that:

1. Pay close attention to the weather changes, pay attention to the process of rice heading and heading, and focus on the prevention and control of the flooded rice in the early stage and the old diseased area.

2. Strengthen the management of water and fertilizer in rice fields, pay attention to field inspections, grab sunny days to catch rain gaps, take proactive prevention, and control the occurrence of pests and diseases in the fields.

3. During the rice filling period, according to the occurrence of pests and diseases in the field, we should do a good job of reviewing and remediating.