Application method of alkenone herbicide

Enoxone, a stem and leaf herbicide, is a highly efficient, safe and highly selective ACCase inhibitor. It has a special effect on most annual and perennial grasses and is safe for dicotyledonous crops. So what is the method of using enoxone herbicides?

The main results are as follows: 1. It is critical to master the appropriate period of application. In the middle of November, we carried out the experiment of alkenone in winter rape field in Wuhan. The results showed that the leaves of the weeds at 4-5 leaf stage were obviously yellowed 3 days after application, and the heart leaves were easy to pull out at 7 days, and the base blackened. Most of them died after 21 days. When applied, the weeds below 3-leaf stage and above 5-leaf stage did not have a little effect until 5 days and 7 days respectively. On the 21st day, the former had almost no effect, while the latter had obvious leaf yellowing. The reason for our analysis is that the age of the grass is too old, the drug resistance increases and it is difficult to control; but before the three-leaf stage of weeds, the leaves are erect, the heart leaves are less exposed, and the dosage is less, and a considerable part of the weeds have not been unearthed at this time. On the other hand, enoxone is a stem and leaf herbicide, which has no pre-bud blocking effect on weeds, and the weeds emerging after application also cover up the control effect of enoxone. When the grass age is 3 to 5 leaves and the growth is exuberant, the pesticide is easy to be sprayed on the leaves of weeds, and the absorption and conduction velocity of weeds is also fast. one application can effectively control most of the weeds of Gramineae.

2. Pay attention to the influence of climatic conditions on drug efficacy. Weeds absorb chemicals through the stomata and stratum corneum on the leaf surface, a large number of stomata are closed and the cuticles are thickened under the conditions of drought, high temperature and low temperature, which are not conducive to the absorption of weeds. The relative humidity of the air is more than 65%, morning and evening are chosen in summer, and spraying at noon on a sunny day in winter, which is conducive to the absorption and efficacy of the drug. In early July, when we tested in summer soybean field in Hebei Province, the temperature was as high as 35 ℃. After 7 days, only some wheat seedlings (wheat in front of soybean field) showed leaf tip withering and yellowing, but later in the day, when the temperature dropped to 26 ℃, the effect was obvious. Too high temperature weeds stomatal closure causes slow absorption, coupled with the spray on the leaves of the agent is quickly evaporated, the efficacy is not good.

3. Weed growth and efficacy. In the middle of November, we sprayed envalerone on the rape fields of Hubei and Anhui at the same time, and the control effect of the former was obvious two weeks later, while that of the latter was only one month after application. We discussed and compared the temperature, relative humidity, rape and weed growth data and photo data of the two places at that time, and found that there were some differences between the two places. At that time, the wheat nipples in the two places were basically 3-5 leaf stage, and the 12cm was about high. But the leaves of Euphorbia angustifolia in Hubei are yellow, the leaves are scattered and soft, the heart leaves are exposed, and the leaves in Anhui are dark green and upright. We think that the upright leaves are easy to roll off and not easy to stick, and the cuticle of the leaves is also thick, which affects the absorption rate of the solution. Therefore, when preventing and controlling such weeds, we should pay attention to the effect of spraying, and be sure to spray thoroughly.

4. Pesticide application technology. With a good sprayer, the spray droplets are small and easy to stick to the leaf surface without rolling off, thus improving the absorption and utilization rate of weeds. The comparison between Shandong Weishi brand sprayer and general sprayer proves this point. After spraying with a good sprayer, it can be seen that there is a layer of dense droplets adhering to the leaves of weeds.

5. The difference of farming methods. After the previous crop harvest, hard stubble sowing or ploughing is rough, and large soil clods can be seen in the field. Weeds grow in rice stubble, wheat stubble or hidden in the soil, resulting in the liquid can not be sprayed on the weeds, not only poor control effect, but also a waste of manpower and material resources. So a little more careful farming can save a lot of trouble in the future.