What is the weeding technology of wheat before winter?

Weeding before winter is an important part of wheat field management. Generally, weeds emerge in 25 ~ 30 days after sowing, accounting for more than 80% of the total grass, which is the best time for chemical weeding in wheat fields. Chemical weeding was carried out at seedling stage before overwintering, and the weeds were just unearthed, so they were tender and easy to prevent. According to the recent investigation by yanshi city Plant Protection Station, weeds have been generally unearthed in the fields where the sowing date of wheat in our city is before 65438+ this year1October 20th due to sufficient rain before sowing. The average amount of weeds in general plots is 3 ~ 34 plants /m2, and the highest amount can reach 182 plants /m2. At present, after the sowing date of wheat is 65438+1October 20th, there are a few newly unearthed weeds in the field, and the weed density is generally 1 ~ 15 plants/m2. It is suggested that farmers seize the favorable opportunity before winter and do a good job of weeding before winter.

Control method:

To control broad-leaved weeds, spray 10% tribenuron 10g, 20% fluroxypyr 30ml or 5.83% tribenuron-fomesafen10ml, 3% fomesafen-oxazolidinone 40ml and water 30-40kg evenly; To prevent and control gramineous weeds such as wild oats and milkweed, use 50-70 ml of 6.9% fenoxaprop-p-ethyl emulsion in water or 20 g of 15% propargyl wettable powder per mu, add 30-40 kg of water and spray evenly; In the wheat field where Aegilops tauschii occurred seriously, 30 ml of 3% methyl diphenyl sulfuron oil suspension concentrate and 30 kg of water were sprayed per mu. In the plot with mixed weeds, the two herbicides can be diluted twice and mixed.

The recommended application time is from the end of165438+/kloc-0 to the beginning of 65438+February. The main weeds are basically in full bloom, with 3-5 wheat leaves and 2-4 weeds, and the temperature is higher than 10℃ (the average daily temperature is above 5℃). Attention: Pay attention to the weather forecast, ensure that there is no cold weather within 3 days after spraying, and be careful not to spray the medicine again or miss spraying, in case of phytotoxicity or unsatisfactory control effect. It is necessary to give full play to the role of specialized service organizations for plant protection, and try to use large and medium-sized spray bar sprayers to ensure the control effect. It is suggested that 2 ~ 4 grams of Bihu should be added per mu when chemical weeding in wheat fields, which can effectively prevent phytotoxicity. In order to reduce the use of pesticides, reduce the cost and improve the weeding effect, Jijian 15g can be added per mu.