Aphis gossypii, commonly known as honey beetle, is an often-occurring pest of cotton. It is mainly harmed by cotton from late May to early June (miao yan), from mid-July to August (fuxi). The cotton aphid is sucked into the back of the cotton leaf by means of a sucking mouthpiece or sucked sap from a tender tip. The victim blade curls toward the back, and the leaves have honeydew (oily) excreted by the mites, which often breeds mold. After the cotton was damaged, the plants showed dwarfness, smaller leaves, reduced number of leaves, shortened roots, delayed bud emergence, reduced number of bolls, and delay in opening of the boll.
At present, cotton in most areas of our province is about to emerge or has already emerged. It is a good time to control cotton locusts at seedling stage. Here are some suggestions for how to more effectively prevent cottonseed meal:
First, choose a good agent
As cotton aphid occurs every year, the number of drug control is more and more, resulting in various degrees of drug resistance to various types of pesticides, resulting in a decrease in the control effect of multiple agents. However, due to the different levels of resistance, the following agents can still receive good results if used scientifically.
1. Imidacloprid. Is a neonicotinoid insecticide (including acetamiprid, thiamethoxam, clothianidin, etc.). In this class of agents, imidacloprid is the best value for money. It has broad-spectrum, high-efficiency, low-toxicity, low-residue, and is safe to humans, animals, plants and natural enemies. It also has multiple effects such as contact, stomach poisoning, and systemic absorption. The systemic absorption is mainly transmitted from the root to the whole plant. . Anti-cotton aphid can be used seed dressing or spray method.
2. Ding sulfur carbofuran. It is a carbamate insecticide and is moderately toxic. It has the functions of contact, stomach and systemic absorption. Spraying is generally used.
3. Methomyl. Also belongs to carbamate insecticides, highly toxic, with contact and stomach poisoning, generally using spray method.
Pymetrozine. It belongs to pyridine insecticide and it is a brand-new non-killing insecticide. Its action mode is very unique. Immediately after exposure to pymetrozine, the aphid produces pin-acupuncture obstruction, stops feeding, and eventually dies of hunger. For this reason, pymetrozine has a slower killing effect. Pymetrozine has a contact killing effect on aphids, as well as systemic absorption activity. The drug is low-toxic and safe for certain important natural enemies or beneficial insects such as ladybugs, grasshoppers, spiders, etc.
5. Endosulfan. As an organochlorine pesticide, highly toxic, with contact and stomach poisoning, general spray use.
Second, choose the right dosage form and dosage
Most of the above-mentioned various agents have different dosage forms and contents. For example, imidacloprid is a suspension agent, a wettable powder, an emulsifiable concentrate, a microemulsion, and the like, and the content thereof is 10%, 25%, and 70%. Different applications use different dosage forms, for example, cotton seed dressing should use 70% imidacloprid seed coating agent, and spraying can choose other various dosage forms. Due to the different dosage forms of the same agent, different dilution times should be used for field spraying. For example, spraying 10% imidacloprid to dilute 1000 times, if using 20% ​​imidacloprid, it needs to be diluted 2000 times.
At present, due to the increased resistance of cotton aphid, many of the recommended doses used at the time of registration are often less effective. The appropriate dilutions for the recommended sprays of these agents are as follows:
10% imidacloprid wettable powder 1000 times (the rest of the dosage form can be calculated accordingly); 20% solution of methomyl emulsifiable concentrate 1000 times; 20% carbosulfide emulsifiable concentrate 1000 times solution; 25% pymetrozine wettable powder 1500-2000 times liquid; 35% endosulfan EC 1000 times. Water consumption per mu is not less than 30-45 liters.
Third, master the science of pesticide application technology
1. Spray mainly on the back of cotton seedlings and spray it evenly, because some medicines do not have systemic absorption.
2. The nebulizer must beat enough air to increase the pressure so that the droplets are smaller and more uniform and not easily lost.
3. It is best to spray before 9am or after 5pm.
4. Advocate for rotational drug use and rational blending.
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