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春玉米占我省玉米面积的一半,南北各地都有种植,是高原、山区的主要粮食作物。自大面积推广种植杂交玉米以来,产量有了显著提高。但是近三、四年来,丝黑穗病在春玉米地区蔓延扩大,危害逐年加重,成为玉米生产上突出的问题。如铜川市因玉米丝黑穗病为害,每年损失玉米二、三百万斤。该市红土公社1975年玉米亩产为340斤,1976年因丝黑穗病严重,亩产减为291斤,1977年又下降为231斤,仅太和寺生产队就损失玉米二万斤以上。蒲城县春玉米面积约十八万亩,其中广阳区普遍发病,一般发病率30%左右,最重田块病株率达50—60%。咸阳地区北六
Spring maize accounts for half of the corn area in our province, with planting all over the north and south. It is the main food crop in the plateau and mountainous areas. Since the large area to promote the cultivation of hybrid corn, the yield has been significantly increased. However, in the last three or four years, head smut spread and expand in the spring maize area, the harm is increasing year by year, becoming a prominent issue in corn production. Such as Tongchuan corn smut damage, annual loss of corn 2-3 million jin. The red earth commune in 1975, per mu yield of 340 kg of corn, ear smut in 1976 due to serious, reduced to 291 kg per mu, down again in 1977 to 231 pounds, only Taihe Temple production team lost more than two jin of corn . Pucheng County spring corn area of about 180,000 mu, of which the prevalence of Guangyang District, the general incidence of about 30%, the most serious field plots rate of 50-60%. Xianyang North six