Maize pest control technology Hummer prevention and control method, Hummer is a general term for insects, and the thrips that harm China's corn are mainly corn yellow horses, wolf horses, rice tube thrips, all of which belong to the order of the thrips The first two belong to the genus Polygonaceae, and the rice-planted hummer belongs to the genus Panicidae. It occurs on the corn for 2 generations and is parthenogenetic, mainly caused by adult feeding on corn. Let’s take a look at it. How to control corn thrips!
Damage characteristics of corn thrips
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, and most of them are harmful on the opposite side, resulting in discontinuous silver-white food grains with worm stains. The corresponding parts of the front of the leaves show yellow streaks.
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 time grows, it rarely turns to the new mouth.
The occurrence of corn thrips
In the spring, the yellow pheasant first breeds on wheat and other crops, and the latter gradually shifts to the spring corn bacterium. Because of the large area of ​​wheat, the insect source of spring corn and medium corn is mainly from wheat.
Generally, from the end of May to the beginning of June, there is a nymph peak in wheat and spring corn. In June, there is another adult peak in wheat, spring corn and medium corn. In June, there is a nymph peak, 7 In the first half of the month, an adult peak appeared on spring corn, middle corn and summer corn. Therefore, the emergence of these several peaks, in the prevention and control, should take timely measures according to the situation of the insects.
Corn thrips occur
Hummer prefers dry conditions, and occurs in low-pitched, windy and arid corn fields. Interplanted corn in small and sparsely populated plots of wheat plants is often seriously affected. The rains from May to July in the year have a greater impact on the occurrence of thrips, and drought and rain are beneficial. In general, the number of occurrences on corn is spring corn > medium corn > summer corn. Although the amount of single insects on the intercropped corn is less than that of spring corn, it is more severely damaged and is more severely damaged in the absence of water and fertilizer.
Corn thrip horse prevention method
- When corn is planted in the seedlings, attention should be paid to the removal of the seedlings and the removal of the manure from the field, which can reduce the spread of the horses. The leaf end hardened part is manually removed to restore the growth of the new leaves. Timely irrigation and fertilization, strengthen management, to promote the early growth of corn seedlings, can effectively reduce the damage of thrips.
- Spraying 10% imidacloprid WP 1500 times solution, or 20% imidacloprid soluble solution 3000-4000 times solution, or 26% chlorofluoro acetamid hydrazine dispersing granule 5000 times solution, or 3% at the beginning of corn thrips. Acetamiprid 1500 times solution, or 10% cypermethrin emulsifiable concentrate 2500 times solution, or 2.5% emulsifiable concentrate 2000-3000 times solution, or 20% imidacloprid solvent 3000-4000 times solution.
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