【摘要】 1987～1992年,对中国东半部11个省(市)24个县(市)的栗疫病进行了调查研究,查明此病在中国东半部普遍发生,且发病率和严重度北方栗产区普遍高于南方。经调查分析,明确了栗疫病的发生以锥栗最重,日本栗系统的丹东栗其次,板栗的抗病性最强;树龄增加,则发病率和严重度上升;此外,栗树的繁殖方式、立地条件、地理环境、林分组成和栽培管理等因素都与之有关。本文还探讨了利用栗疫菌低毒力菌株进行生物防治的可能性。更多还原

【Abstract】 Investigations on eleven chestnut-growing provinces in east China during 1987～1992 showedthat the chestnut blight could be seen everywhere and the disease incidence and severity were higher innorthern than in southern regions.Based on the investigations and analyses,among the three species ofCastanea investigated,C.mollissima showed the highest resistence to the chestnut blight The diseaseincidence and severity increase with the aging of chestnut trees.In addition,the occurrence of chestnut blightin the above-mentioned areas is closely relaed to the reproductive methods,the standing conditions,thegeographical environments,the components of standing forest and the cultivation management of chestnuttrees.The possibilities of using hypovirulent isolates for biological control are considered.更多还原