In The Second Half Of The Year, The Three Generation Of Cotton Bollworm In Shandong Will Reach An Area Of 10 Million Mu.

According to the forecast of the occurrence trend of crop diseases and insects in the second half of 2008, according to the crop pest survey and report station of Shandong Province, the disease and insect pests of cotton were heavy.

1. Helicoverpa armigera: it is estimated that the three generation of cotton bollworm will be 5 in the whole province, the Southwest Shandong Province and the 4 grade in Dezhou. The area is estimated to be 10 million mu.

The four generation of Helicoverpa armigera 1 class, is expected to take an area of 7 million acres.

Forecast basis: (1) the number of remnant insects is high: 56.31 heads per mu, less than 05-07 years (109.5 head), still significantly higher than the average annual value of 21.7.

Meteorological conditions are more favorable: most of the province in July -9 is near normal or slightly higher.

In July, the main cotton areas in -8 months were near normal or slightly less. In September, the precipitation in northwest of Shandong Province was slightly more than that of other years.

3. The growth of cotton seedlings is favorable: cotton grows well and the resistance of insect resistant cotton decreases gradually with the growth of cotton.

2. Cotton aphid: Grade 2, with an estimated area of 8 million mu.

3, cotton wilt disease: 2 level, local 3 level, and the estimated area is 6 million mu.

4. Cotton bug: 2 level, 3 level, with an estimated area of 8 million mu.

5, cotton bollworm disease: Grade 2, partial 3, and the estimated area is 6 million mu.

6. Cotton spider mite: Grade 2, with an estimated area of 6 million mu.

7. Cotton field Bemisia tabaci: 3, with an estimated area of 9 million mu.

8. Cotton thrips: density increased during flowering and boll stages.

The estimated area is 4 million mu.