In vegetable production, a major pain point faced by many vegetable farmers is root-knot nematodes, and they hope to be able to control root-knot nematodes through high-temperature stuffy sheds. However, judging from the situation reported by vegetable farmers, the stuffy shed effect of some sheds is not good, and root-knot nematodes are still seriously harmed.
Although the shed is stuffy in summer, in the middle and late stages of vegetable growth, vegetable farmers have to combine the application of root-knot nematode pesticides for prevention and control, which will inevitably increase the cost of input. So, why is root-knot nematode so difficult to control?
Reason 1:
Root-knot nematodes are a kind of living form that exists in nature, and the control is a worldwide problem, similar to flies and mosquitoes, and it is very difficult to completely eradicate them. Therefore, it is difficult to completely eradicate root-knot nematodes through a product, a measure or a set of technical solutions.
Cause 2:
The high-temperature stuffy shed mainly uses the high temperature in summer combined with chemical drugs or biological products to kill and inhibit the insects and eggs of harmful bacteria and root-knot nematodes and other pests in the soil. However, many vegetable farmers do not cover the mulch film when they are engaged in high-temperature stuffy sheds.
In the case of root-knot nematodes, for example, root-knot nematodes can die in 10 minutes in soil at 55°C. If the mulch film is not covered, although the temperature in the shed can reach more than 60°C-70°C after the air outlet is closed, the temperature at 5 cm-10 cm of the soil surface will be 40°C-50°C, and the temperature will decrease after that. This makes it difficult to achieve the effect of comprehensive sterilization and thorough insecticide. Therefore, when the summer is hot and stuffy, don't be too troublesome, be sure to cover it with mulch.
Reason 3:
Root-knot nematodes are most abundant in the soil layer 3 cm to 20 cm below the surface, and this is where vegetable roots are most concentrated, so they are easily infected by root-knot nematodes. Root-knot nematodes are found in the soil as eggs or third instar larvae, and there are also a large number of root-knot nematode eggs in the infected root system. When the vegetable farmer pulls the seedlings and clears the garden, he directly pulls the plant out of the shed or returns the straw to the field after picking the last fruit, so that a large number of roots containing root-knot nematodes will remain in the soil, which increases the number of root-knot nematodes in the soil and further improves the difficulty of controlling root-knot nematodes in high-temperature stuffy sheds.
At the same time, after pulling the seedlings to clear the garden or returning the straw to the field, the vegetable farmer will immediately push in the manure, and then plough the ground, at this time, the root-knot nematode in the area of the 3 cm-20 cm tillage layer below the surface and the remaining root-knot nematode in the root system will be turned over to the tillage layer below 15 cm -20 cm with the machine, which also increases the difficulty of root-knot nematode control.
Therefore, in order to effectively control root-knot nematodes, vegetable farmers must choose efficient stuffy shed products and strict stuffy shed steps to improve the effect of sterilization and insecticide in stuffy sheds.
Source: Northern Vegetable News