Although the locusts and thrips are small, they are the main pests of greenhouse vegetables in recent years. Symptoms of locusts are similar to virus diseases and hormonal poisoning, and they are easily misdiagnosed by vegetable farmers. Thrips are not easy to be found in field management. With the increase of temperature, many signs of the harm of these two kinds of pests have been found in many vegetable sheds and they must be strictly controlled.
Insect mites, such as the tea tree borer, are mainly harmful to the delicate tissues of the vegetables. They are used to pierce the stems, leaves, and fruits of vegetables to harm the plant growth points and young fruit, often resulting in deformed or cracked fruits and gray or white brown leaves. Plant growth is blocked and grows weak. It is also because the mites are more harmful to plant growth points, so their symptoms are similar to those of hormonal poisoning or viral diseases. Vegetable farmers must learn to identify, do not misdiagnose and mistreatment, so as not to miss the timing of prevention and control, resulting in the occurrence of locusts.
The locusts have a disease center in the field, and most of them occur in sections. After the leaves were damaged, the back turned brown with oily, distorted deformity, and downward curling, which was different from virus disease and hormone poisoning. After the fruit was damaged, the skin was “rustâ€, yellow-brown, corked, and cracked. The aphids are mainly two-spotted spider mites and tea astragalus. They can be sprayed with 1500 times solution of fenvalerin and avermectin 2000 times for control.
Hummer sucks the mouth of the vegetables to suck the sap of young shoots, young leaves and young fruits. The young leaves and young shoots become hard and narrow after being damaged, the hairs turn grayish brown, the internodes are shortened and the growth is slow; the young fruit suffers from hardening, epidermis browning or corkation. Severe damage often causes the growth of vegetables to be blocked or fallen. It should be reminded that the sucking mouthparts of Hummer will not cause the skin to "cut" when it is harmful to the fruit.
Thrips breed quickly and easily, and they often hide in the back of the leaves or flowers during the day. Therefore, they can be sprayed and smoked together to prevent and control them. The foliar application of the dish was 2000 times liquid plus Alavan 1000 times, but it should be noted that the time of application should be in the evening before the closure of the shed; smoking Shi smoke or imidacloprid smoke agent.
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