Control of Maize sheath Blight

It is reported that in the southern corn planting area, the incidence rate is about 40% in general years, 70% in severe cases, and 100% in individual plots or varieties; the incidence in seed production fields is even higher, and the plant incidence in general years is more than 50%, and there is a trend of increasing year by year. In the maize growing area of Yunnan, due to the high temperature and humidity during the growing period of maize, sheath blight has become the first major disease of maize.

Maize sheath blight is a fungal disease, which mainly affects leaf sheath and leaves from grain formation to filling stage. When the temperature and humidity of the maize field in central Yunnan were suitable in the first and middle of August, the sclerotia on the soil surface began to germinate and form hyphae, which infected the basal leaf sheath of maize and gradually spread upward. Seriously affect the yield of corn. Combined with the report of corn sheath blight and the actual situation of corn planting in Chuxiong Prefecture, some preventive measures were put forward.

Preventive measures:

1. Cultivation control under the premise of high yield, tillage and cultivation measures are used to control the occurrence and development of maize sheath blight, which is beneficial not only to the balance of ecological environment, but also to the growth and development of host crops. The commonly used methods are:

1.1 choose the hybrids with good disease resistance. There are some differences in resistance among varieties, and the selection of resistant or tolerant varieties is the most economical and effective measure to control the disease.

1.2 fertilization. Pay attention to balanced fertilization, prevent late de-fertilization, avoid partial application of nitrogen fertilizer, and increase potassium fertilizer in an appropriate amount.

1.3 drainage and reasonable close planting. Pay attention to timely trench drainage, reasonable close planting, reduce field humidity, in order to reduce the degree of disease.

2. Drug prevention and treatment

Timely application of pesticides for prevention and control. When the rate of diseased plants in the field reaches 3%-5%, use 1000 times of Jinggangmycin per mu, 50% Nongliling can be diluted, or 50% carbendazim wettable powder 40 grams, spray 50-70 kg of water, and control again every 7-10 days. The leaf sheath of diseased leaves should be removed before application.