According to recent surveys of plant protection stations in various provinces, some corn major producing areas in Heilongjiang Province have developed corn spot disease to varying degrees, and there are large differences between different plots and different varieties. The relatively heavy Shuangcheng, Bayan, Hulan, Zhangzhou, Wuyuan, Tailai, Wangkui and other places, the diseased plant disease rate is generally between 5-35%, and some serious plots are close to 80. %; the incidence of diseased plots in other areas such as Anda, Longjiang, Jidong, Qinggang, Mishan, etc. is generally between 5-15%, and some serious plots are close to 50%. The lesion has now expanded to the middle and upper leaves. The main disease varieties are Xianyu 335 series, Xinxin No.1, Xinxin No.2 and so on.
The main causes of the disease are as follows: First, the corn in Heilongjiang Province is densely planted, the field density is large, and the permeability is not good. Second, the corn area is expanding year by year, the area of ​​heavy hoe is large, and the control area is extremely limited, resulting in a large accumulation of field bacteria; Third, the corn planting varieties are more mixed, most of them are less resistant; the fourth is the use of cornfield long-acting fertilizer, which causes the phenomenon of fattening in the middle and late stages of corn growth to be serious and easy to be affected; fifthly, the meteorological conditions from July to August this year are favorable to corn. Large spot disease occurs.
The recent low-temperature and rainy weather in Heilongjiang Province is very conducive to the occurrence of corn leaf spot disease. It is expected that the extent and extent of corn spot disease will be further aggravated, and individual areas will reach a certain degree of occurrence. All localities should immediately organize cadres and agricultural technicians, conduct in-depth investigations in the field, closely monitor the development of the disease, increase the propaganda and guidance of prevention and control work, actively organize the majority of farmers, and make full use of self-propelled high-stalk crop sprayers and other medical devices. To overcome difficulties, timely control of large spot disease to ensure the safety of corn growth.
Prevention and treatment recommendations:
1. Strengthen field management, timely topdressing, pay attention to irrigation and drainage, reduce field humidity, promote healthy growth of corn, and enhance disease resistance.
2. Prompt spraying and prevention. It is necessary to make full use of the self-propelled high-stalk crop sprayer for field spray control operations. 50% carbendazim wettable powder 100g / mu; 25% triazolone wettable powder 100g / acre; 75% chlorothalonil wettable powder 130g / acre, sprayed once every 7 to 10 days, a total of Prevention 2 to 3 times. Adding 200 g of potassium dihydrogen phosphate per mu of liquid can improve the control effect.
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