Corn thrips are the main pests in the corn seedling stage. Adults or nymphs suck the young leaf juice in the corn heart and destroy the growth point of the corn. The corn leaves are yellow and chlorotic, and the corn leaves are curled into cows. The shortening of the tail-shaped deformity growth period is what the growers often say as "corn twisting core", which seriously affects the normal growth of corn.
Its body size is small, the activity is hidden, it is not easy to be discovered, and it is easy to miss the control period, which will cause the corn field to be aggravated. If the measures are not taken in time, the new core leaves will rot:
According to recent surveys, the base number of the horses in the corn field is obviously high. The rate of Weihai worms is 100%, the number of worms is 1000-5000, and the highest is 85; the average rate of damaging in Tai'an Daiyue District is 34%, the highest is 78%.
The rate of victim strain in Heze is 20-50%; the average rate of harmed plants in Binzhou is 10.5%, the highest is 48%. According to the monitoring and forecast by the National Meteorological Center, the precipitation in Shandong in June was 2-50% less than normal. The accumulated rainfall in most of North China and the northern part of Huanghuai was only 15-20 mm, and the temperature in the southern part of Huanghuai was 1~2 °C higher. The rainy weather is extremely beneficial to the hazards of the thrips.
It is expected that this year's Hummer will be heavily biased in the corn fields of our province, and local occurrence will occur. In order to control the occurrence of corn thrips and ensure that the corn seedlings are full of seedlings, all localities should pay close attention to the dynamics of the thrips in the corn fields and timely organize scientific control.
01
Agricultural measures
1. Clear the weeds in the field in time to reduce the source of insects.
2. When combining the seedlings in the field and fixing the seedlings, remove the seedlings and bring out the destruction outside the field to reduce the spread of the thrips.
3. For corn seedlings with twisted heart leaves, an awl can be used to plunge from the base of the whip leaves, open from the middle, and let the heart leaves return to normal growth.
4. Avoid drought after corn planting, timely watering, and promote the early growth of corn seedlings.
02
Chemical control
Due to the serious occurrence of thrips in recent years, the conventional drugs imidacloprid and acetamiprid have produced obvious resistance, resulting in low control effect.
A large number of tests have shown that thiamethoxam, nitenpyram, pymetrozine and ethyl spinosyn are less resistant to thrips and can obtain relatively high control effects.
At the same time, pests such as Laodelphax striatellus and aphids can be treated. At the same time, according to the habit of the night and night, try to prevent in the morning or evening.
Or in the corn 3-4 leaf stage, using 20ml/mu for a long time and 30kg for water, it can effectively control pests such as corn aphids, gray planthoppers and thrips. It can be mixed with corn seedling herbicide for a long time, weeding and killing insects, saving labor and worry.
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