First, the tea
Mainly in the greenhouse greenhouse propagation hazards, the site of damage to the top of the plant leaves, when the young leaves grow old, that is, from the old leaves to new leaves, it is also known as "green leafhopper." After the leaves were damaged, the back turned brown with oily, distorted deformity, and severe dry top. After flower and fruit damage, it does not bloom, does not bear fruit, the peel is yellow-brown, corked, and cracked.
Control methods: Use 73% of Krypton 1000 times, 25% extinction Manganese wettable powder 1000 ~ 1500 times solution or 10% killed dead net 3000 times solution, spray every 5 ~ 7 days, even spray 2 to 3 times. In addition, after harvesting the former crops, it is necessary to remove the fallen leaves in time and burn them in a concentrated manner, and spray the pesticide in the entire shed to kill the insects.
Second, the red spider
The spider mites that occur in winter and spring greenhouse vegetables are mainly Cinnamomum cinnamomea and Tetranychus urticae. About 20 generations a year. Severe under high temperature and dry conditions (developmental temperature is 21-30 degrees Celsius), temperature over 30 degrees Celsius, humidity greater than 70% of the conditions unfavorable. The hazard is to suck juice on the back of the leaf with a sucking mouthpart and form a wire mesh. The victim leaves turn green and white dots appear, and then the leaves dry up. It generally harms the lower leaves first and then spreads from bottom to top.
Control methods: timely removal of the old leaves, and brought out of the shed burning. Adjust the temperature and humidity inside the shed to create a high-temperature, high-humidity environment and timely watering to suppress its spread. Chemical control can be used 1.8% of the 2000 grams of agricultural grams, 20% of 2000 grams of 2000 grams of emulsifiable concentrate or 40% of the aqueous emulsion of emophosfite 2000 times, every 7 to 10 days, 1 spray, and even spray 2 or 3 times.
Three, locusts
Greenhouse locusts are mainly bursa, pods, and peach pods. One year can occur 20 to 30 generations, endangering all year round. The locusts are clustered on the back of leaves and tender stems, sucking plant juices with sucking mouthparts, making the leaves yellow, curled, or even dead. In addition, locusts also spread viral disease and are extremely harmful.
Control methods: Use 25% Cascadine 1000 times, 10% cyhalothrin 2000 times, and then add the same amount of synergist, such as the elimination of liquid and other prevention. Spray every 3 to 5 times, and spray 2 or 3 times.
Fourth, the horse
The main harm to melons, eggplants, legumes and other vegetables. The nymphs are yellow and the adults are brown and yellow. It takes about 15 generations a year, breeds all year round and overlaps from generation to generation. More damage in the back of the leaf or into the petals, sucking shoots, shoots, flowers and young fruit juice. The shoots, flowers and young fruits are dark brown and harden and shrink, which seriously affects the growth.
Control methods: Use 25% Cascadine 1000 times or 10% high efficiency cyhalothrin 2000 times, and then add the same amount of synergist, such as anti-fat liquid for prevention and treatment. Spray once every 3 days and spray 2 or 3 times.
Fifth, leaf miner
The main hazards are beans, solanaceous fruits, cruciferous vegetables, welsh onions, leeks, etc. 4 to 5 generations a year. Eggs lay inside the flesh, and the larvae feed on the leaves. After the leaves are damaged, they turn green and turn white.
Control methods: After the vegetables are harvested, the remaining leaves of the residues are removed in a timely manner, concentrated and burned to reduce pests. In addition, 25% ikas 1000 times, 10% high efficiency cypermethrin 2000 times, 20% chrysantha 2000 times, or 21% chlorimuron emulsion 3000 times, and then add the same amount of synergist for control. Spray every 3 to 5 days, and spray 2 or 3 times.
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