傳播途徑和發病規律：病菌在土壤、病殘體和種子中越冬。種子果皮帶菌，胚和胚乳不帶菌。病菌在土中可長期存活。播種后病菌從傷口或幼根直接侵入發病，潛伏期一般7天，病菌生長溫度10-33℃，以23℃最適宜，重茬年限越長發病越重，低洼地，種植密度大易發病。 

    防(fang)治(zhi)方法(fa);1選用抗(kang)病品種(zhong)(zhong)；2.實(shi)行合理輪作，避免(mian)重(zhong)茬；3.加強栽培管理，增強植株抗(kang)病性；4.應用種(zhong)(zhong)子(zi)(zi)包(bao)(bao)衣技術，包(bao)(bao)衣劑(ji)(ji)中既有(you)殺(sha)蟲(chong)劑(ji)(ji)又有(you)殺(sha)菌(jun)(jun)劑(ji)(ji)，還有(you)向日葵(kui)所需的多種(zhong)(zhong)微(wei)量元素。其藥效持續45-50天，可(ke)(ke)有(you)效防(fang)治(zhi)地下害蟲(chong)；5.藥劑(ji)(ji)拌種(zhong)(zhong)，用50%多菌(jun)(jun)靈或甲基硫菌(jun)(jun)靈可(ke)(ke)濕性粉(fen)劑(ji)(ji)按種(zhong)(zhong)子(zi)(zi)量的0.5%拌種(zhong)(zhong)，也(ye)可(ke)(ke)用80%抗(kang)菌(jun)(jun)劑(ji)(ji)402乳油1000倍液浸(jin)泡種(zhong)(zhong)子(zi)(zi)30分鐘，晾干后播(bo)種(zhong)(zhong)，還可(ke)(ke)用農抗(kang)120水劑(ji)(ji)50倍液，于播(bo)種(zhong)(zhong)前土壤處(chu)理，每(mei)畝用對好的藥液300升；6藥劑(ji)(ji)防(fang)治(zhi)，必要(yao)時用20%萎銹(xiu)靈乳油400倍液灌(guan)根(gen)，每(mei)株灌(guan)對好的藥液500毫升。