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Cotton Bolls Are Seriously Damaged In Boll Stage In Most Cotton Regions Of China

2010/8/25 19:14:00 61

At present, most cotton regions in China

cotton

In the flowering stage.

According to the monitoring of the total population of the third generation of cotton bollworm in the cotton area, the combined generation of the fourth generation cotton bollworm is estimated to be 25 million mu. In the northern part of Jiangxi and the central part of Hubei, the occurrence of the fourth generation of cotton bollworm takes place in Hebei, Tianjin, Henan, Anhui, Hunan, Hubei and Jiangxi.

The following is the forecast.

1. The third generation adults in the Yangtze River and the Yellow River River Valley are 1-4 days longer than the whole year, and Xinjiang is 2 days earlier.

The third generation of adults in the Yangtze River Valley and the the Yellow River River Valley (the 3 day of adult emergence is the fourth generation egg bloom) in the middle and late 8 months, 1-4 days later than the same period of the same year.

The period of Hebei is -9 on August 15th, 4 days in August 15th, 4 days in August 15th, and 5 days in August 25th. It is 2 days in Tianjin than in the year of August 25th, and 2 days in August 25th than in the ordinary year. Shanxi is the 1 day of the month of August 23rd, which is 4 days longer than the usual year; Shaanxi is August 22nd day of August 22nd, 2 days are 2 days later than ordinary days; Henan August August day is more than that of ordinary year; Anhui is on the day of August; the day of Anhui is more than that of the year; Jiangsu is -9, the month is third days longer than the year after year. Specifically, the third generation of adults everywhere.

The third generation of adults in southern Xinjiang was on the 3-11 day of September, 2 days earlier than usual.

Two, third generations of each cotton region

Cotton boll

The total number of insect pests is generally lower than that of perennial, and some cotton areas such as Shandong are higher than last year.

The total population of the third generation of Helicoverpa armigera was 31.2%, 36.5%, 21.6%, 52.5%, 8.8%, 31.3%, 25.6%, 74.6%, 53.1%, 60.1% and 60.1%, respectively, compared with the average in the past years. Hebei, Tianjin, Shandong, Shanxi, Shaanxi, Henan, Anhui, Jiangsu, Hubei, Hunan and Southern Hunan were higher than those of last year.

Three. Late onset of late onset of the Yangtze River Basin and southern Xinjiang

cotton field

High area ratio is beneficial to the occurrence of Helicoverpa armigera.

This year, Hebei, Henan, Shanxi and Anhui accounted for 8%-16% of late growing cotton fields. The ratios of Shandong, Shaanxi, Jiangsu, Jiangxi, Hunan and Xinjiang to 27%-37% were 48% and 9.8%, 14.6%, 32.7%, 33.4% and 32.2% respectively.

Henan, Hebei, Shanxi and Shaanxi decreased by 35.1%, 14.6%, 2.3% and 2% respectively, which were harmful to the fourth generation of Helicoverpa armigera in cotton fields.

Four. Meteorological conditions in most cotton regions are not conducive to the occurrence of Helicoverpa armigera.

According to the National Climate Center, in August, there were more precipitation in most parts of the the Yellow River River Basin and the Yangtze River Basin. Among them, most parts of Henan, northwest Anhui and Northern Hubei were about 2, which were harmful to the fourth generation of Helicoverpa armigera.