At present, the use of pesticides to fumigate soil is a good way to control root-knot nematode diseases and soil-borne diseases. However, in practical production, many vegetable farmers did not achieve good results after applying such methods. After an interview, the reporter concluded that this may be caused by improper use of soil fumigants by vegetable farmers. Therefore, the reporter hereby puts the following points to the attention of vegetable farmers:
The timing of fumigation is too early: The time to use soil fumigant to disinfect the soil must be well grasped, and the best results are obtained immediately after the harvest of the previous crop. If the root-knot nematode is smoked, the root-knot nematodes mostly gather on the surface of the soil and are more likely to be concentrated and killed. Otherwise, other diseases and insect pests will migrate to the deep soil layer and then disinfect the soil, which will reduce the effect. As a result, some germs will have a chance to escape and will happen again in the coming year.
The operation of fumigation should be rigorous: general fumigants require loose soil, especially the tillage layer. If the soil is not turned or soiled, the soil is too strong or the soil moisture is too large or too small, and other residues in the soil will affect the fumigation. effect. Moreover, fumigation requires the soil to be in a confined state in order to maximize the role of fumigant. Therefore, the fumigation must be covered with a film to prevent the effect of gas leakage.
Prevent reinfection after fumigation: The fumigant simply destroys the existing pests in the soil. It does not have a valid period, and it is incapable of re-incoming pests and diseases. After the fumigation, nematodes and other diseases and insect pests were soon discovered, may not be not smoked, but the pests and diseases caused by the recurrence of re-infection, such as seedlings with pests. Some of them are rained into the land with pests and insects, outside the shed and pestle with the lace into the other, these should pay attention to, to cut off the nematode re-introduced channels.
In addition, do not avoid smoke after the dumping of soil than the depth of the soil before the smoke, if the smoke does not turn before (overturning) after deep-smoked smoked, will not be dead smoked nematodes and other pests and diseases turned up.
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