Control measures of Weed growth in Wheat Field with serious damage

Weeding in wheat field

The weeds in wheat field are harmful to weeds for a long time and are inhibited by low temperature in winter. There are two peaks of weeding all the year round. The first peak is between 10 and 30 days after sowing. In the first and middle October of autumn, the weeds that occur are Maigong, Artemisia annua, Shepherd's purse, pig seedlings, wisps, cauliflower, lacquer and goose, all of which are perennial weeds. Except a few of these weeds die naturally in winter, most of them can survive the winter safely. It blossoms and bears fruit from April to May of the following year. The second peak of grass emergence is synchronized with the return of wheat to green, after the temperature rises from the end of February to early May in spring. In general years, the occurrence of weeds is mainly in autumn, and the occurrence of weeds in autumn accounts for about 80% of the total, with high occurrence density, long symbiotic period with wheat and serious harm. The control of weeds in wheat field should follow the following points:

The main results are as follows: 1. Change the medicine in spring to that before winter. It is a favorable period for chemical weeding after the fourth leaf of wheat autumn seedlings, because at this time most weeds in wheat field have been unearthed, the grass is young and tender, and the weeds in wheat field can be basically controlled at one time.

2. If there is no time for herbicide in the wheat field before winter, after the wheat turns green, many weeds begin to grow again. It is beneficial to control weeds in the wheat field from the turning green to the early jointing stage, about the first and middle of March, when the daily average temperature is more than 10 ℃.

3. Change the single dose to the mixed drug. Due to the selection of herbicides, it is easy to lead to the decrease of sensitive weeds and the rapid increase of resistant weeds. At present, there are many kinds of herbicides. Therefore, herbicides should be selected according to the occurrence types of weeds in wheat field.

The wheat field of ①, which is mainly composed of Gramineae weeds such as Niangmai and Niangmai in Japan, is sprayed with 69 grams per mu, or 20 grams per mu of wheat extreme 15% ethynyl ester wettable powder, or 50 grams / liter azoline ·alkyne ester EC 60g 100ml, or 50% isoproturon wettable powder 150g, plus 40kg water spray.

② wheat fields dominated by hard grasses can be sprayed with 150g isoproturon wettable powder per mu after sowing and before the 3-leaf stage of weeds. The use of Danneng 50g / L azoline ·alkynyl ester EC 70g / mu, or horse 69g / L, or wheat extreme 15% ethynyl ester wettable powder 30ml / mu also has a good control effect on hard grass, and it is better to apply weeds before winter after seedling. For the fields with a large amount of hard grass and Kentucky bluegrass, Shima 30g / L methyl disulfuron oil suspension can be used strictly in accordance with the instructions to prevent drug damage.

③ wheat fields dominated by broad-leaved weeds such as pig calamity, shepherd's purse and so on, use 200g / L chlorofluoropyloxy acetic acid EC 20ml 25ml per mu before winter or early spring, or 200g / L chlorofluoropyloxyacetic acid EC 20ml 25ml plus 20% 2methyl 4 chlorine 150ml, or 25% herbicide 100ml 150ml plus 20% 2methyl 4chloride 150ml plus water spray control. In addition, Maixi 5.8% difluorazolidine suspension has a good effect on the stems and leaves of most broad-leaved weeds, such as Pig Gao, Mai Jiagong, Dazhao, Ze Lacquer and other broad-leaved weeds.

④ can be divided into two stages according to the above methods to control Gramineae weeds before and after autumn sowing, broad-leaf weeds in early winter or early spring, or mixed use of the above chemicals in wheat fields where Gramineae weeds are mixed with broadleaf weeds.

In order to prevent the occurrence of drug damage, first, it should be used scientifically according to the recommended dose. Second, it is necessary to prohibit or avoid the use of chemicals that cause drug damage to subsequent crops. Third, do not take medicine before the cold spell comes. Do not spray too late, late lead to wheat ear deformity, drug damage. 4. Long residual herbicides chlorosulfuron and metsulfuron-methyl are easy to cause drug damage to wheat, peanuts, corn and other crops after they are used in wheat fields, and their use should be prohibited. 5. Dicotyledonous crops are highly sensitive to 2.4 murine D butyl ester, which is easy to cause drug damage. Wheat fields in mixed areas such as wheat cotton, wheat peanuts, wheat tobacco and wheat vegetables should avoid using 2.4 murine D butyl ester and herbicides containing 2.4 murine D butyl ester for weeding.