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由于近年来的春旱秋涝和病菌残留处理不当,造成了绝大部分地区玉米瘤黑粉病大发生,据农技人员在三个乡镇调查发现,该病发病率在20～60％,病株率为30～50％,严重的地块高达70～80％,造成了玉米的大量减产,因而挫伤了农民种植玉米积极性,引起了各级部门的高度重视。以下将对其发生原因加以分析并介绍相应的防治对策以减轻病菌为害。保护玉米生产。 1、发生原因 (1)头年玉米收获后,冬孢子在土壤中或病株残体上越冬,冬春干燥冬孢子不易萌发,也不易失去火力而死亡。夏季遇到适宜的温湿
In recent years, the spring drought and autumn floods and improper handling of germs, resulting in the vast majority of maize powdery mildew occurred, according to agricultural workers in three townships found that the incidence of the disease in 20 to 60% of the disease Strain rate of 30 to 50%, a serious plot of up to 70 to 80%, resulting in a large number of maize production, thus dampening the enthusiasm of farmers planting corn, has aroused great importance at all levels of departments. The following will analyze the causes of its occurrence and introduce the appropriate control strategies to reduce the pathogen damage. Protect corn production. 1, the causes (1) after the first year of corn harvest, winter spores in the soil or plant overwintering on the residue, winter and spring dry winter spores is not easy to germination, but also not easy to lose firepower and death. Summer encounter the appropriate temperature and humidity