论文部分内容阅读
我区玉米种植面积大,重茬地多,玉米丝黑穗病菌菌源较多,1977年全区因此病玉米普遍减产10%左右。玉米丝黑穗病在果穗上不形成特殊的突起物,但整个果穗全部变成灰包,不抽花丝。灰包包有白色薄膜,以后破裂露出黑粉(厚垣孢子),黑粉随风飞散,仅留一束束的黑丝。病菌孢子主要通过土壤传染,在土中能活两年,其次是种子带菌。当种子吸收水分开始发芽时,在种子上或土壤中的病菌也同时发芽,长出芽管侵入玉米幼芽,以后随着作物生长,形成病穗,最后破坏穗部,使籽粒变成黑粉。
My area corn acreage, stubble to more corn stinking bacteria source more, in 1977 the whole area maize yield reduction generally about 10%. Corn smut does not form a special protrusion on the ear, but the whole ear into a gray package, not drawing filigree. Gray bag has a white film, cracked black powder (chlamydospore), black powder flying in the wind, leaving only a bouquet of black silk. Bacteria spores mainly through soil infection, can live in the soil for two years, followed by the seed carrier. When the seed absorbs water and begins to germinate, the germs on the seed or in the soil germinate at the same time. When the germinating tube is invaded into the bud of corn, the panicle grows to form a panicle and finally destroys the panicle so that the grain becomes black powder.