Moderate and mild occurrence of the second generation of rice borer in Suijiang County in 2007

Rice borer, including Chilo suppressalis, Chilo suppressalis and Chilo suppressalis in our county. In the riverside area, there are three generations a year; in the second and half mountain areas, there are two generations a year. At present, the first generation in Jiangbian area has come to an end, and the second generation has begun to occur one after another.

According to the observation at the Fengchi disease and pest monitoring station in our station, the second generation of borer moths started on June 10, one day earlier than last year, two days later than usual, and the peak day, June 18, was 1 day later than last year, 8 days earlier than that of previous years, and 234 moths were attracted to June 25. The number of stem borer, stem borer and stem borer accounted for 94.9%, 4.7% and 0.4% respectively, and the contemporary number of moths was 27.9% of the average 838 over the years, and 82.1% of last year's 285. The dynamics of borer moths in Nakamura are also similar to those in Fengchi. The number of eggs in the field was examined in 59 rice fields around the Fengchi test site on June 17. The number of eggs per mu was 21,163, with an average of 74.2. More than 30 eggs per mu accounted for 67.4%, and more than 80 eggs per mu accounted for 10.2%. Early planting is more than late planting. According to the comprehensive effects of moth quantity and meteorology, the second generation rice borers occurred moderately and slightly this year. The peak hatching period of rice borer larvae was in late June, and the peak damage period was in the first and middle of July.

Although the number of rice borer of the second generation this year is less than that of previous years and last year, the transplanting period of rice this year is longer and the area of late planting is bigger. at present, some rice seedlings have jointed, while others are still tillering, which is beneficial to larval invasion, and the harm of the same amount of insect source is greater than that of normal years. In order to control the harm of borer, it is advisable to control borer and planthopper by spraying Shachongshuang, Shongshengdan, Dianduo, Chilo suppressalis and other insecticides from the peak hatching period to the second instar, that is, from late June to mid-July. If the drug is applied after the dead heart seedling has been seen, the harm already caused is irreparable, and the insect age is old, the drug resistance is strong, and the control effect is poor, it will get half the result with twice the effort.