Recently, when farmers prepared transplanting cotton seedlings that were incubated with nutrients, they discovered that some of the cotton seedlings had well-developed cotyledons. The center of the middle of the seedlings may have turned black, and some of them have fallen off into light rods. I do not know what insects are responsible for. of? After the author's on-site diagnosis, most of them were pupa horses and both blind and blind. It is recommended that cotton farmers quickly use 25% of the blind cricket (Imidacloprid 1%? Mineral oil 24%) 1500 times solution and silver finches (0.3% acetamiprid wettable powder) 1500 times liquid spraying control, so as to prevent cotton fleas, And governance blind lice and locusts. By observation after treatment, the control effect is very good.
It is also known as smoke thrips or thrips. It takes 6 to 10 generations a year. It prefers sunny and dry weather. The temperature in the middle and late April of this year is stable at 15°C to 25°C, and it is dry and drizzle, which is very beneficial to the thrips. Breeding breeds, so when cotton seedlings are unearthed, they quickly enter the seedbed. Both adult and nymph of thrips can injure the cotton seedlings. They use the sucking mouthpart to suck the sap of the cotton seedlings. In the early stage, they mainly damage the cotyledons and the true leaves. The top growth point is dark brown after being sucked, and some fall off. Stemless headless cotton, severe growth points were also broken and the seedlings died. After the leaves are damaged, there are visible silver-white dots on the back of the leaves. After 1 or 2 true leaves appeared, the true leaves were thickened and the leaves were shrunken, similar to the freezing injury. Lighter damage to the growing point can lead to the formation of long cotton plants, resulting in staggered growth of branches and leaves. Damaged flower buds in the middle period caused buds, flowers and young bells to fall off, which reduced cotton production. Hummer has a strong tendency to white, but is afraid of light and gloomy. It usually goes out on cloudy days or sooner or later, and it is heavier to cover plastic film seedbeds and mulching cotton fields. Production is often based on this characteristic, in the evening to prevent and control.
Blind beetle seedling stage damage cotton, but also adults, nymphs are sucking cotton strains, cotyledon stage damage, resulting in the death of the growing point, the formation of "public cotton." After the true leaves appear, the top buds are injured by the larvae and they will form long cotton. The formation of "breaking head madness" and "breaking leaf madness" in the mid-term will have a greater impact on cotton production.
Therefore, in the prevention and control of more and more early efforts to win the initiative. In addition to using the above pesticides, there are many varieties of pesticides that can be controlled, and local areas can be combined with the actual local flexibility, such as control of cotton thrips, one can choose 3% acetamiprid EC 1500 to 2000 times liquid, two available 1.8% Vermillion EC 3,000 to 4000 times, 30% available 50% phoxim EC 1000 times, 4 can be used 10% diphenex amine 2000 times. Such as the prevention and control of blindness, one can use 2% emamectin benzoate soluble liquid 5000 times, two available 10% imidacloprid wettable powder 1500 times, three available acetamiprid 3% emulsifiable oil 1500～ 2000 times liquid, four available 35% streak suspension agent 5000 ~ 6000 times liquid, five available 90% faster Ling WP 6000 ~ 8000 times, six available 40% chlorpyrifos EC 1000 ~ 1500 times liquid.
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