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There are many kinds of red spiders that harm strawberry. The most important ones are two red spiders and two nymphae spiders. The host plant of the two red spiders is very wide, with more than 100 kinds of fruit trees, vegetables, crops, flowers and various weeds. Red spiders on various host plants can transfer harm to each other. More than 10 generations can occur in a year, overlapping generations and anniversary hazards. The female adult is wintering in the soil, and the second year of spring spawning, and the activity is endangered after hatching. High temperature drying is an advantageous condition for inducing large proliferation of red spiders. The cyclamen red spider mainly harms the greenhouse strawberry. Timely pesticide control is critical.
The larvae and adults of the spider mites suck the juice on the back of the strawberry leaves, so that the leaves form a grayish white spot, and then gradually expand to form a mottled pattern. When the damage is serious, the leaves are rust-colored and dry, and the growth of the plants is inhibited. , causing severe production cuts. The red spider adult has no wings and is transmitted by wind, rain, seedlings, and human body and tools.
Control method: According to the Chinese pesticide network , during the nursery period, pay attention to watering in time to avoid drought. Most of the red spiders have a high density of old leaves in the lower part of the plant, so removing the diseased leaves and the yellow leaves at any time can effectively reduce the spread of insects. Chemical control: Before harvesting, use 20% dimethyl ether emulsifiable concentrate with 1000% to 1500 times of low residual toxicity and strong contact action, spray 2 times, every 5 days. It is forbidden to use 2 weeks before fruit picking. In the protected area, it is generally possible to use the heat preservation as a key prevention period.
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