What is the prevention and control method of corn brown spot? Will it affect the output?

Corn is an important food crop, which is widely planted all over the world, but it is often eroded by diseases in the process of planting, among which brown spot is a serious disease in China in recent years. So, what is the control method of corn brown spot? Will it affect the output?

What is the prevention and control method of corn brown spot?

1. Agricultural measures

The main results are as follows: (1) thoroughly remove the diseased and residual tissue after corn harvest, turn the soil deeply, apply sufficient base fertilizer, and topdressing at the right time. Generally speaking, seedling fertilizer should be applied at the 4-5 leaf stage of maize, and urea (or nitrogen, phosphorus, potassium compound fertilizer) 10-15 kg / mu should be applied. If diseases are found, topdressing should be applied immediately and pay attention to the combination of nitrogen, phosphorus and potassium fertilizer.

(2) selection of disease-resistant varieties and rotation for more than 3 years

(3) applying compost retted by Japanese enzyme bacteria or fully mature organic fertilizer, timely topdressing, ploughing and weeding to promote the healthy growth of plants and improve disease resistance.

(4) the planting density should be sparsely planted (3500 plants / mu for large panicle varieties and no more than 5000 plants / mu for density-tolerant varieties) to improve field permeability.

2. Chemical control

(1) early prevention

The occurrence of corn brown spot can be prevented by foliar spraying with 1000 times of 25% trimethoprim or 1500 times of tebuconazole every 667m2.

(2) treatment of the disease.

At the beginning of the disease, corn was sprayed with 1500 times of triadimefon wettable powder or fungicides. In order to improve the control effect, some foliar fertilizers such as potassium dihydrogen phosphate, diammonium phosphate aqueous solution, blue Jingdian multi-element micro-fertilizer and Zhuang Han liquid fertilizer can be added to the solution, combined with quick-acting fertilizer, which can control the spread of the disease and promote the health of corn. improve the disease resistance of corn. According to the characteristics of rainy climate, germicidal agents should be sprayed 2-3 times, with an interval of about 7 days, and make up spraying if it rains within 6 hours after spraying.

Second, will corn brown spot affect yield?

Maize brown spot is mainly harmful to maize leaves, leaf sheaths and stems. At the initial stage of the disease, small round or oblong yellow spots are formed in the diseased part, and many small spots are usually connected together to form a septal transverse banded macula, and the main leaf veins often have septal striped black spots; in the later stage, the diseased tissue gradually turns brown or dark brown and heals into large and irregular patches, which often causes death in the diseased part, which has a great impact on the yield. It often occurs mixed with maize leaf spot and Curvularia leaf spot in the field.

For corn brown spot, we should follow the policy of "prevention first, treatment as auxiliary", and prevent and control it from agriculture, so as to get twice the result with half the effort. If the disease has already occurred, chemical control measures should be taken immediately.