How is the phenomenon of corn root rot produced? What pesticides can be used for control?

Maize root rot mainly occurs in maize seedling stage, which seriously affects maize yield. The pathogenic conditions of root rot are closely related to improper fertilization, and the plots lacking potassium fertilizer are more likely to get root rot. There are many reasons for corn root rot and withering: specifically, root rot leads to stem rot and even the death of the whole corn. Drainage problems, too much rain, over-irrigated roots, rotten branches and withered plants. The water surface exceeds the center of the leaf and the soaking time is too long. It is difficult for corn branches to carry out aerobic respiration, and the permeability of root system is very poor.

Biological control: spraying 300 times of Yonghe Feng solution on the seedbed, or spraying 300 million CFU/ g Trichoderma harzianum wettable powder with water, 2-4 grams per square meter; After transplanting, spray it with 200 times solution of Yonghe Feng. First, there are more pests in the field this year, the most in the past year. The second reason is that the root fertilization is too close to the heel. The third reason is the formation of fake pesticides, chemical fertilizers and pesticides. The fourth reason is that the soil is hard and airtight.

It is found that deep burial can be treated by spraying streptomycin, dicumyl, octyl amine, zhongshengmycin, clothianidin copper, Tai Sen copper, quinoline copper, chlorobromoisocyanuric acid and Paecilomyces polymyxa. Spray continuously for 2-3 times every 5 days. The root rot of maize seedlings may be caused by long-term low temperature, or it may be the residue of last year's drug damage. Recommend a foliar antidote, brassinolide, which I use very well and has a good effect of relieving phytotoxicity.

Generally speaking, as mentioned in the title, the root rot phenomenon of corn soil is easy to appear shortly after the growth and planting of corn, according to the solar terms, that is, before and after the long summer solar terms. In my hometown, the older generation of farmers used certain skills to defend against this problem, and they all added "stubble turning" in their hometown. In other words, this land will be planted with corn this year and potatoes may be planted next year. The well-developed potato root system is conducive to loosening the soil, and corn will be planted next year. In the process of maize growth, yellow seedlings died. Generally speaking, there are insects that need to be removed.