The red spider, also known as leaf mites, is one of the main pests on the facility's watermelon. As the temperature continues to rise, the watermelon red spider begins to enter the initiation stage, and the field is dominated by a mixture of dimaculated leaf mites and cinnabar leaf mites. Red spiders can occur throughout the growth period of watermelon, the light affects the yield and quality, and the heavy causes large-scale death or extinction, bringing great harm and loss to the production of watermelon.
Pests occur and do
Red spiders can breed 12 to 15 generations per year in greenhouses in the northern region, and high temperatures and droughts are conducive to the outbreak of red spiders. When the temperature rises early, when the temperature is high, the leaf mites occur early and the damage is serious. Greenhouse due to the high temperature, red spiders occur relatively early, the initial source of insects is generally transplanted with watermelon, melon seedlings into the shed, there are also sheds in the shed overwintering or weeds around the shed after the migration of leaf mites, with the help of wind or with the operation of agricultural operations spread, spread.
It usually starts in April and peaks in June and July as temperatures rise. In the case of adult mites, nymphs and young mites gathering on the back of the leaves to spit silk knots and suck sap, pale spots appear in the early stage of leaf damage, gradually turn yellow, and when the leaves are scorched and fall off prematurely or even die as a whole plant.
Usually first harm the lower leaves, gradually spread upwards, after the leaf damage seriously affect photosynthesis, the yield and quality of watermelon has a great impact, generally can cause melon crops to reduce yield by 15% to 20%.
Diplodocus leaf mites are harmful to watermelon symptoms
Red spiders are harmful to watermelon in large areas
Methods of control of predatory mites
The technology of controlling red spiders, a natural enemy variety developed by the Research Group of Predator Mites of the Institute of Plant Protection of the Chinese Academy of Agricultural Sciences, has been widely used in the cultivation of vegetables, strawberries and melons, and has achieved good control results. The effect of releasing predatory mites in the watermelon greenhouse in Changping District of Beijing to control red spiders is obvious.
Release predatory mite charts
Renderings of the control of red spiders by the small plant mite in Chile
The use of Chilean small plant mites to control watermelon red spiders can be completely comparable to chemical pesticides, the maximum control effect can reach 100%, can completely replace chemical acaricides, and no pollution for melon farmers and environmental safety. We hope that we will work together to create an ecological home for you that uses less chemical pesticides.
Author: Wang Endong, Xu Xuenong (Institute of Plant Protection, Chinese Academy of Agricultural Sciences)
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