Shelter vegetables should be protected against root-knot nematode disease

Root nematode parasitic nematodes. Larvae are slender wormlike. Adults are male and female. Male adults are linear, slightly rounded at the end, colorless and transparent, multiplying in size (1-1.5 mm) by (0.3-0.4) mm and living mainly in the soil near the roots. The female pear-shaped, milky white, multiplied by (0.25-0.8) mm in size (0.44-1.59), spawned 300-800 eggs per head, and was buried in the host tissue, resulting in mutations in the host tissue that became root knotworms. Body, mostly buried in root knots.

Vegetable root-knot nematode disease is one of the devastating diseases of vegetables. The root-knot nematodes are ubiquitous in the soil, especially in greenhouse vegetable bases with sandy soils, which are more prone to disasters. A large number of root-knot nematodes have a wide range of hosts. Except pepper, onion, and garlic, no infection has been found. Almost all other vegetables have been harmed, especially melons, eggplants, and beans. The most important.

First, the key to preventing root-knot nematodes in vegetables is to prevent invasion.

The method is to disinfect the soil before the vegetable is sown, so as to kill or prevent the nematode from invading the roots prematurely. According to a professional greenhouse vegetable trial, 10% Yishubao Granules and 3% Milur Granules are effective drugs for the control of root knot nematode diseases in vegetables. However, the dosage per acre must be about 5 kilograms to play a role in killing the root-knot nematode. When applying pesticides, it is best to use ditching, so that concentrated use of drugs can increase efficacy and protect vegetable roots from damage.

Second, medication prevention

Vegetable root-knot nematode disease, to avoid causing drug damage. The use of the above two granules causes severe phytotoxicity to the cucurbits. Therefore, when the soil is used for soil disinfection, it must be covered with soil and then planted so that the vegetable seeds or roots cannot be directly contacted with the drug.

Third, improve the soil and enhance disease resistance

For sandy loam vegetable land, it is also necessary to apply organic fertilizers to improve the soil fertility, so as to promote both the rapid growth of vegetables, enhance disease resistance, and change the soil properties, create a soil environment that is not conducive to the survival of root-knot nematodes, and reduce the roots The purpose of knot nematodes occurs.

Fourth, prevention and control measures

Root-knot nematode disease has become a major disease on vegetables in greenhouses. It mainly harms cucumbers, tomatoes, and kidney beans. It is more common in the old sheds. At present, more effective prevention measures include:

1. Rotating cucumber, tomato, and kidney beans with resistant disease-resistant vegetables is a highly sensitive dish, which is susceptible to disease. Welch onions and peppers are resistant to disease, and a 3-4-year crop rotation can play a certain inhibitory effect.

2. Grasping the drug during the critical period is the key period for prevention and cure. When transplanting, the hole is applied with 6% Arocides, and the mu is used with 0.8 kg.

3. In the early stage of drug growth during the growth period, 2% avermectin EC is irrigated with water at a rate of 3,000 times, and 6% Arocide is also used to irrigate 1500 times.

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