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Prediction Of Occurrence Trend Of Diseases And Insect Pests Of Cotton And Other Main Crops In Shanxi Province In July

2010/7/8 11:44:00 54

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Based on the meteorological conditions in June and the weather forecast in June, combined with the relevant data of pest and disease survey data of the provincial plant protection station, it is estimated that the cotton aphid will occur in the main cotton producing area in southern Shanxi Province in July, and the three generation cotton bollworm will be lighter.

According to the climate center of Shanxi Meteorological Bureau, the whole province in July

Precipitation

Between 75 and 170mm, the precipitation in the northern part of Lvliang and the northwest part of the city is less than 1~2. In the north part, it is less than 2. In the central and southern part, the precipitation is more than 1~2. In July, the average temperature in most parts of the province is slightly higher than that in other parts of the country. In some areas, the temperature is higher than 0.5, and the temperature in the southern part is slightly lower.

July entered the main flood season, southern Jinzhong.

precipitation

In recent years, precipitation has been decreasing in the north.

With potato and cotton entering flowering stage, the common diseases and insect pests of various crops have gradually entered the multiple period.

The low rainfall in the north in July may continue to cause drought in the north and central parts of the country. Precipitation in the southern part of July is not conducive to the occurrence and development of the three generation of Helicoverpa armigera.

Based on the above analysis and model calculation, it is estimated that the cotton aphid will be located in the southern part of the province in July.

Cotton producing area

Moderate occurrence occurred in the three generation of cotton bollworm.

Supplement:

Occurrence and control of main diseases and pests in cotton fields

I. occurrence

1. Cotton Verticillium Wilt and Verticillium wilt. According to my station investigation, the cotton blight and Verticillium Wilt in the early cotton field began to develop, and the rate of serious farmland disease was 20%.

Weather forecast this year Meiyu period more rain, is conducive to the spread of Cotton Verticillium wilt epidemic.

2. Bug bug: the present bug has been pferred to cotton fields, causing cotton "no head cotton" and "broken leaf mad".

In June 20th, the average number of bug insects was 1.2, and the highest number was 10.

The cotton planting area is larger this year, and the bridge hosts are more favorable for the occurrence of the bug.

3. Aphids and spider mites: my recent survey shows that the aphid rate of cotton aphids is 0 to 30%, the average aphid rate is 9%, the number of aphids is 86, and the rate of rolled leaves in a few plots reaches 20%.

This year's cotton seedling stage is low temperature and rainy for a long time, and the occurrence of red spider in seedling stage is lower than that in the same year.

Two, prevention and control advice

1, cotton Verticillium and Verticillium wilt: prevention and control of Cotton Verticillium and Verticillium wilt is mainly controlled by agriculture.

Chemical control: the old disease fields should be widely applied before the onset of the disease.

Suggestions are as follows: (1) 80% times 1500 times of liquid medicine of ethyl allicin is sprayed or irrigated; second, 50% carbendazim 800~1000 times liquid spray or root irrigation. When the above medicaments are irrigated, 802 802 10 ml, 98% potassium dihydrogen phosphate 30 grams or 15 grams of potassium rich potassium can be added to each 15 kg of liquid medicine.

2. Bug bug: when the number of hundred insects reaches 10, 48% chlorpyrifos EC, 45% malathion EC, or 40% propoxorus EC, or 26% chlorofluoroacetamiprid water dispersible granules can be sprayed.

3. Aphids and spider mites: when the rate of aphids is 10%, it is recommended to use 25% imidacloprid 2000 times liquid or 3% acetamiprid to spray 1000 times.

When the mites rate reaches 14%, it is recommended that 3% avermectin wettable powder 2500 times liquid or 10.5% avermectin and tetranychin wettable powder 1500 times liquid spray.