Corn thrips are the main pests in the corn seedling stage, and adult or nymphs suck the young leaves juice in the corn heart. In recent years, the thrips of corn have been aggravated, and the plots covered by early sowing and wheat straw are heavier; the main damage time is in the 3-7 leaf stage, and the latent damage is in the 1 leaf stage (ie, 1-2 after corn emergence). Day), during this period, drilling and spawning, to the formation of heart leaf curl in the 3-7 leaf stage, the individual plots formed a second damage from late July to early August.
The second-generation armyworm and the second-generation cotton bollworm often mixed, and some fields often caused destruction. All in all, no matter what kind of disease prevention and control point is to ask for a word - "early". Therefore, I hope that the farmers’ friends will recognize the corn thrips and do the prevention and control of the corn thrips.
Corn thrips pest symptoms:
The thrips are mainly harmful in the corn heart, and at the same time, mucus is released, so that the heart leaves cannot be unfolded. With the growth of corn, the corn heart leaves form a "whip". If measures are not taken in time, it will result in reduced production or even no harvest.
Adults are slow-moving, mostly on the opposite side, causing discontinuous silver-white food grains with worm stains, and the yellowish streaks appear on the corresponding parts of the leaves. The adult lays eggs in the mesophyll of the feeding place, and the white point of the needle tip is visible to the light. Most of the damage is concentrated on the second to fourth or second to sixth leaves from the bottom, even if the new leaves grow out, they rarely turn to the new mouth.
The relationship between the occurrence of corn thrips and the climatic environment:
The occurrence of corn thrips and horses is closely related to the damage and rainfall, and has little to do with temperature. Drought is beneficial to the occurrence of corn thrips, rainfall has a greater inhibitory effect on the population, and can also promote corn growth, and its good compensation can reduce the damage.
The occurrence of corn thrips is related to the microclimate in the field. In the wheat-covered corn fields, the environment of the ditch, road and canal is relatively ventilated and dry, the amount of corn thrips is large, and the ridges are more damp and humid. It is small. Weeds are the middle host of the Hummer, the weeds are more fields, or the corn near the weeds on the ground. The amount of insects is large and the damage is heavy.
Corn thrips control measures:
1. When the seedlings are fixed, pay attention to the removal of the seedlings and bring out the fertilizers outside the field to reduce the spread of the horses.
2. For corn seedlings that have formed a "whip", an awl can be used to puncture from the base of the whip leaf, open from the middle, and let the heart leaf return to normal growth.
3. Timely irrigation and fertilization, avoid drought, strengthen management, to promote the early growth of corn seedlings, create a small field environment that is not conducive to the survival of the thrips, can effectively reduce the damage of thrips.
4. Hummer has a strong tendency to blue, and can hang a blue plate in the field to trap the adult.
5. Prevention and control of thrips is the most economical and effective way to spray insecticides early after emergence of corn. When using drugs, it should be noted that the drugs should be sprayed into the corn heart. The agents that can be selected include imidacloprid, acetamiprid, beta-cypermethrin, deltamethrin, etc. These agents are effective and have a long-lasting effect. However, because thrips are highly resistant to pesticides, they must be used in accordance with pesticide rotation. in principle.
Precautions:
1. The horses linger in the night and choose to use the medicine in the morning or evening.
2. Because the breeding speed of the thrips is extremely fast, it is necessary to prevent and control in advance. If the control period is missed, the dosage is large and the effect is not good.
3. When spraying and controlling, it should be comprehensive and meticulous. The hummer is inhabited in the middle and lower parts of the plant and on the ground. It is best to spray on these parts of the plant when spraying.
4. The occurrence of corn thrips has the characteristics of serious overlap, large amount of insects and heavy damage, and the worms are small. The newly hatched nymphs are as small as needle tips. The hazard of activity is very hidden and not noticed. Farmers sometimes think that It is a seed quality problem that causes disputes and should be given enough attention. (Pesticide Assistant)
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