Control techniques of weeds in wheat field before winter

With the change of farming system and the influence of climatic factors, the weed community in wheat field has changed greatly. The species and scope of malignant weeds in wheat field are increasing continuously, and they compete with wheat for fertilizer, water, glory and space. As a result, the individual development of wheat is poor, the population structure becomes smaller, the uniformity of wheat in the field is reduced, the yield and quality of wheat are reduced. And seriously affected wheat production. The occurrence area of our county has reached more than 20, 000 mu, of which brome is mainly more than 13000 mu, with an average density of 5. 5 trees per square meter and the highest density of more than 200 trees. All townships in the county have occurred to varying degrees, mainly concentrated in Kaoling Township, Zhonghanzhuang Township and Gudian Township. The peak period of weeds sprouting in the field is usually before winter, and the weeds are easy to control before winter, so weeding before winter is the key period of weeding in wheat field.

1. Choose suitable herbicides correctly.

(1) Control of broad-leaf weeds. Our county is mainly to sow Artemisia annua, shepherd's purse, wheat bottle grass and other broad-leaved weeds, can choose superstar, thiosulfuron, benzenesulfuron, isoproturon and other pesticides. Use 10-15 grams of benzenesulfuron per mu, spray 30 kilograms of water evenly or choose 2mae4murine D butyl ester.

(2) Control of Gramineae weeds. Shima, PUA tiger or Kuoshima were selected for control in the wheat fields dominated by brome, Shima was selected in the wheat fields dominated by Aegilops tauschii, and Puma was selected in the wheat fields dominated by Gramineae weeds such as Niangmai and wild oats. Spray 30 kg of water with 3% Shima oil suspension 20-35 ml (3 grams per mu). When dispensing medicine, you should first use a small amount of water to form a mother liquid, add water according to dilution times, stir well and spray evenly.

(3) the wheat fields with more Mai Jia Gong and pig seedlings should be controlled by the combination of Mai or Kuaimianling + Macron. You can use 40% carbendazim 4-5 grams + 18% billion 5 grams or wheat 30-40 grams, or you can also use 40% carbendazim 2 grams + 10% Macron 8 grams, 30 kilograms of water mixed stem and leaf spray.

(4) the mixed fields of Gramineae weeds and broad-leaved weeds can be mixed with superstar or benzenesulfuron plus Poma or Shima.

2. Several problems should be paid attention to in prevention and control:

(1) weeding time. Generally controlled in winter wheat sowing a month later, our county for mid-November, wheat 3-4 leaves, weeds 2-3 leaves when control. The general temperature is no less than 10 degrees.

(2) Scientific mixing. Spray all kinds of herbicides, do not spray mixed with organophosphorus pesticides without experimental verification, so as to avoid drug damage. Do not mix with other gramineous herbicides.

(3) safe use of drugs. Strictly control the dosage, period and water consumption, spray should be uniform and thoughtful.

(4) choose suitable weather. It is not suitable to use herbicides in bad weather.

(5) the equipment after application should be cleaned thoroughly so as not to cause drug damage to other crops.

(6) the plots with poor control effect of chemical weeding should be pulled out manually.

(7) 2pyr4-butyl ester is sensitive to dicotyledonous crops such as cotton, vegetables and fruit trees. After the use of this drug, there is a residual drug equipment and then spray cotton and other crops often occur drug damage, the need for special use of medicine and equipment. Therefore, in the wheat fields in cotton and peanut areas, we should try not to use 2-4-butyl ester, especially in spring, we should pay attention to the accidents caused by dicotyledonous plants such as cotton, peanuts and fruit trees.