Exploring the reasons for the poor effect of avermectin on root knot nematodes
Recently, many vegetable farmers have reported that the bio-pesticide avermectin has a poor effect on the control of root-knot nematodes, and some even say that it has no effect. In fact, avermectin has a strong killing effect on root-knot nematodes, ectoparasites and Other arthropods, but why do you report poor results? Xiaobian for everyone to explore the reasons: horse fence,High Quality horse fence,horse fence Details Hebei Giant Metal Technology Co., Ltd. , https://www.358fencing.com
After the results of the interview with avermectin, Xiaobian learned that avermectin is not effective and has a lot to do with their improper use. Many vegetable farmers feel that it is very troublesome to irrigate with avermectin. The avermectin is washed into the ground with water, so as to prevent root-knot nematodes, the effect will definitely be greatly reduced. Because the avermectin use ratio is 1500-2500 times, the effect can be guaranteed. That is to say, when applying with water, it should be ensured that only one kilogram of avermectin is added to each side of the water. How many vegetable growers can do this large amount? But if this concentration is not reached, That avermectin is difficult to fully play its role, which is why vegetable farmers reflect the poor effect of avermectin on root-knot nematodes.
It is understood that not only avermectin, but also a lot of medicinal herbs used for rooting, vegetable farmers are all rushing with water, in fact, this is a waste of pesticides, the effect is not good.
Because pesticides are applied with water, the concentration of pesticides is difficult to grasp. The use of pesticides is in the optimal concentration range. With the application of pesticides with water, the amount of water is difficult to control, and the amount of water is unclear. It is difficult to calculate how much pesticide should be filled. The vegetable farmers can only estimate. If the concentration does not reach the optimal concentration range, the effect is difficult to guarantee.
In addition, the cost of pesticides with water is high. A moderate amount of watering, about 20 tons of water per mu, if the effective concentration of the drug is 500 times, then 40 kg of pesticides are needed; if it is 2000 times, 10 kg is also needed, and the cost of buying pesticides is not small.
There are also pesticides that increase the residual pesticides in the soil. If pesticides are applied with water all year round, the pesticide residues in the soil will exceed the standard, then the balance of soil microorganisms will be broken, and the damage will exist for a long time, and the potential problems are difficult to estimate.
The China Pesticide Network reminds farmers to use pesticides in strict accordance with the instructions for use. For example, avermectin is used to control root-knot nematode disease. It is best to use chitin in a single plant to ensure the concentration. Without causing waste.