How to control wild weeds in wheat? What potions can be used?

Weeds are important pests that harm wheat yield, so they should be removed in time, and experience has shown that weeds in the field before winter can increase yield. How to control wild wheat weeds? What potions can be used?

First, how to control wild wheat weeds?

1. Prevention and control before winter

The main control of Gramineae weeds, about before the first ten days of November, wheat grows 4-5 leaves, weeds generally grow into 2 leaves and 1 heart, and the control effect is the best.

two。 Spring prevention and control

The main control of broad-leaved weeds is from late February to early March, the control period should be early rather than late, it is difficult to control weeds too late, and wheat may cause drug damage.

In addition, at present, wheat weeding before winter has entered a critical period, and here we should especially remind wheat growers to choose the right medicine, master the spraying technology, and make use of all available space to do a good job in the current chemical weeding work according to temperature, moisture, seedling age and grass age.

1. Wheat is not treated with herbicides before and after jointing.

Most wheat field herbicides are used after 4 leaves and are stopped at the jointing stage of wheat. Before the 4-leaf stage, wheat is relatively delicate, detoxification ability and immunity are low, and it is easy to produce drug harm; after jointing stage, wheat enters the booting stage, which is also the most fragile and critical period in life, when using herbicides is very easy to produce drug harm. sometimes it will cause wheat ear can not be pulled out or deformed, seriously affecting the final yield, in addition to chlorofluoropyloxyacetic acid herbicides can be halved after jointing, other herbicides had better not try!

two。 The daily average temperature is below 8 degrees without herbicides.

Except for a few herbicides (difluorosulfonamide, more resistant to low temperature), general herbicides are not ideal in low temperature weather, and are easy to cause drug damage. Therefore, it is best to use the medicine when the daily minimum temperature is above 8 degrees, and the higher the temperature is, the better the weeding effect is, because the weeds absorb light and grow vigorously, the stomata are open, and it is easy to absorb water and liquid, but the opposite is true when the temperature is low.

3. No herbicides in dry weather

In addition to looking at the temperature, the herbicide should also grasp the soil moisture. In the case of serious drought, it is necessary to seize the opportunity of watering the wheat field and apply the herbicide in time to ensure the effectiveness of the herbicide. The effectiveness of most herbicides requires a certain amount of soil moisture. When the soil moisture is 40%-60%, it is most beneficial to the efficacy of herbicides.

4. Herbicides are not used when wheat seedlings are weak and their roots are exposed.

In general, straw will be returned to the field in winter wheat fields, and the plots are relatively loose. if you encounter abnormal weather years (such as warm winter and drought), the roots of wheat may be too loose to tie deeply, or part of the roots may be exposed. Such wheat is easy to cause frostbite and lack of water, and is more sensitive and fragile, if herbicides are easy to cause damage to wheat at this time.

5. Herbicides are not used when wheat diseases occur.

In recent years, wheat sheath blight, root rot, total erosion disease and other seed-borne or soil-borne diseases occur frequently, and the resistance of diseased wheat is very low. Once drug damage occurs, it is not easy to recover, so it is generally not recommended to use herbicides in seriously sick wheat plots.

6. Do not use herbicides before and after heavy rain and before cold air arrives

On the one hand, the use of herbicides before and after heavy rain and cold air affects the effect of weeding, on the other hand, it is easy to cause drug damage. The use of herbicides is prohibited in severe weather such as frost, rain and snow, hail and cold snap, which belong to bad weather, especially in the 7 days before the cold in late spring, so pay more attention to the weather forecast in winter.

7. No herbicides were used 7 days before and after the use of organophosphorus and carbamate pesticides.

As we all know, it takes an interval of seven days to use herbicides in corn fields after treatment with organophosphorus or carbamate pesticides, while it takes at least seven days to use herbicides in wheat fields. Otherwise, it is easy to cause wheat yellowing and leaf burning, because organophosphorus pesticides reduce the ability of wheat to degrade herbicides, followed by the use of herbicides.

8. Do not respray or leak spray

The use of herbicides must be uniform spray, if there is a leak or less spray, weeds are uneven, the control effect is not good; secondly, remember not to re-spray, will cause wheat yellowing, easy to cause herbicide damage.

What chemicals can be used to control wild weeds in wheat?

1. Weeds in wheat fields are divided into dicotyledonous weeds and monocotyledonous weeds. Dicotyledonous weeds are also called broadleaf weeds. As we all know, soybeans and peanuts belong to dicotyledons. Dicotyledonous weeds are similar to soybeans and peanuts. They also have two cotyledons when they emerge. Like corn, monocotyledonous weeds have only one cotyledon. The sensitivity of these two types of weeds to herbicides is very different. Before turning green to jointing, the common dicotyledonous weeds in wheat fields are Artemisia annua, pig seedlings, wisps, shepherd's purse, wheat bottle grass, Maijiagong, goose do not eat, lacquer and so on.

2.2.4 murine D butyl EC: to control dicotyledonous weeds, you can choose 72% 2.4 murine D butyl EC, or 20% dimethyl tetrachloride EC, or 75% giant star dry suspension, or 20% EC to enlarge it.

For the wheat field dominated by Artemisia annua, 72% 2.4 murine D-butyl EC, 30-50ml per mu, or 20% dimethyltetrachloride, 250-300ml per mu, 30kg of water, evenly sprayed.

3. Benzenesulfuron: another herbicide used to control broad-leaved weeds in wheat fields in spring is the superstar, also known as Broad-leaf Jing. Superstar is a highly effective herbicide against broad-leaved weeds in wheat fields, and the suitable period for use is longer than 2.4 murine D-butyl ester. It is safe for wheat to grow two leaves from autumn to use before jointing. 75% dry suspending agent is commonly used, which is sprayed evenly with 0.9 to 1.4 grams per mu and 30 kilograms of water. The effect is also very good in the 3-leaf stage to 4-leaf stage before winter.

4. Other medicament: the wheat field which is mainly composed of pig seedlings and Mai Jiagong, using the mixture of Thalon and dimethyltetrachloride, the weeding effect is good. The specific dosage is: make it long 20-25 ml with 20% per mu, add 20% dimethyl tetrachloride 125ml, 30kg with water, spray evenly.

The mixture of paracetamol and 2.4 murine D butyl ester can also be used for the control of pig seedlings. 48% 13.3ml per mu plus 72% 2.4 murine D butyl EC 25ml, mixed with water 30kg, evenly sprayed.

The following herbicides can be used to control Monocotyledon weeds such as wild oat and sorbita: 36% herbicide EC, 6.9% Poma suspending agent and 25% green Malone wettable powder.