Skillful Prevention of Cotton Diseases

In recent years, the harm of diseases has become one of the important factors restricting the yield and quality of cotton. For some diseases, the symptoms are not obvious at the beginning and are easy to be ignored, but it is too late to take measures when they are serious. Especially in the continuous cropping land, cotton farmers have a headache for some common diseases and soil-borne diseases, and they often feel helpless. For this reason, cotton diseases should be "dominated by prevention and supplemented by treatment". There are many diseases of cotton, but there are two main diseases that make cotton farmers feel a headache: one is the problem of dead seedlings caused by Verticillium wilt after emergence, and the other is Verticillium wilt. These two diseases are also misunderstandings in the prevention and control of cotton farmers for many years. On the one hand, they do not know what kind of chemicals to choose. There are too many kinds of chemicals on the market, and there are not many agents that really work, resulting in the wrong choice of drugs for cotton farmers. Second, do not know the time of prevention, wait until the disease has been completely up before using medicine, has caused a lot of losses, so many cotton farmers have a wrong idea that cotton diseases do not have the rule of law.

The prevention and control of cotton diseases are as follows:

1. Seedling disease-blight (dead seedlings). After the cotton seedling was unearthed, the yellow-brown disease spot appeared at the base of the stem (where it meets the land), gradually expanded, sunken, rotted, the color was black and brown, and the cotton seedling withered. Farmers are commonly known as "black neck" disease. The resistance of cotton seedlings was the weakest within 15 days after being unearthed, and the disease of cotton seedlings with low temperature and high humidity occurred seriously, and the continuous cropping became more and more serious. Therefore, the control of two points: ① sowing before coating, every 2 to 3 jin of seeds with Gaoqiao 10 ml + home Yiwei 50 grams seed coating, not only control Verticillium wilt and Verticillium wilt, but also play a role in increasing production; ② cotton seedling timely spraying prevention, the best control effect is: Ruimiaoqing 2000 times liquid + Biou 15000 times liquid, sprayed to the root and stem of cotton seedlings can effectively control the phenomenon of dead seedlings.

two。 Verticillium wilt. Both Fusarium wilt and Verticillium wilt can harm the vascular bundle tissue of cotton, resulting in vascular bundle blockage, yellowing, drying and shedding of cotton leaves, turning cotton plants into light stalks, wilting and even withering.

Prevention and control methods:

1. Prophase prevention: in the early stage of cotton growth (May 25, June 23) to carry out two necessary medicament prevention, choose Ruimiaoqing (2000 times liquid) + home Yiwei (750x liquid) spray, the control effect is as high as 90%.

two。 Spraying root irrigation with Ruimiaoqing (2000 times liquid) + Jiayiwei (750times liquid) or Haolike (5000 times liquid) + Fusarium wilt Great Savior (750x liquid) can effectively control the development of the disease.