为害程度及发生规律玉米螟不仅为害玉米,各地区高粱、谷子也受到不同程度的损害。1952及1953年是玉米螟大发生年,山东、河北、河南、山西个别有的玉米减产竟达8—9成,一株秸秆内有虫30—40条,严重者有80—90条。虫株发臭味,牛不喜食。1954年一般为平常发生年。根据华北农业科学研究所基点研究材料,在 Degree of harm and the occurrence of corn borer is not only harmful to corn, sorghum, millet in all regions have also been varying degrees of damage. In 1952 and 1953, the annual occurrence of corn borer occurred. Individual corn production in Shandong, Hebei, Henan and Shanxi decreased as much as 8-9%. There were 30-40 insects in a straw and 80-90 in severe cases. Insect stinks, cattle do not like to eat. 1954 is generally normal year. According to the North China Institute of Agricultural Science, the basic point of research materials,