First, the symptoms
The symptoms of the damaged parts of the plants were not obvious, and they generally showed yellowing of plants, varying degrees of dwarfness, poor fertility, and low fertility, and wilting or withering at noon during drought. The disease mainly occurs on the fibrous roots and lateral roots of tomato. There is a small milky white nematode in the root knot. The new roots produced on the root knots are re-infected and form root-knot neoplasms. , Dysplasia, even premature death withered. Because the temperature and humidity in the environment in the shed are conducive to the continuous growth and development of the nematode, the nematode begins to invade the roots of the tomato to form root knots or nodules. The nematode eggs hatched in tomato roots and left the egg shells at the second instar to form a re-infestation. The activities of soil neutrons and loose texture in the solar greenhouse are suitable for nematode activity, especially in greenhouses that are continuously affected by continuous cropping. Root-knot nematodes are mostly distributed in the area where the crop roots are located, and most of them are active in the top soil layer of 3 to 10 cm.
Second, prevention and control measures
The current greenhouse tomato production can be used in the prevention and treatment of pesticides, can be washed Shijianjianbao fertilizer or Avi organic fertilizer can effectively inhibit the root nematode damage, but also can be used 1.8% abamectin 1500-2000 times plus harvest No. 1 800 times irrigation Root, or choose to use Volvo, blessing, security, etc. can be irrigated. If the root-knot nematode is very strict, it can be used in July and August to take advantage of Bromochlor or lime nitrogen, etc., which can effectively kill nematodes, harmful bacteria, and weeds.
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