摘要
芦笋茎枯病菌以分生孢子器在病株残茬上越冬,成为翌年发病的主要初侵染源。分生孢子释放高峰为4月26日至7月9日。分生孢子释放、萌发、侵染必须在有水的条件下进行。孢子萌发需有芦笋组织液做营养激发,在清水中不萌发。病菌从侵入到形成新的分生孢子一个侵染周期在23—27℃为10—12天,17—22℃为15—20天。采笋田茎枯病发生发展经过扩展期(7月—8月上旬),盛发期(8月中旬—9月)两个阶段。雨日雨量是决定茎枯病消长流行的主导因素,降雨后5—7天田间即出现一次新侵染高峰,大雨或连阴雨后尤为明显,秋季早上植株结露有利茎枯病菌后期侵染。在化学防治上,日本产别腐烂(Befran)和国产复方多菌灵胶悬剂是防治芦笋茎枯病较理想药剂。
Stem rot of Asparagus(Phoma asparagi Sacc.)occurs seriously inthe asparagus cultivated area in the east coastal provinces.Its epidemicregularity and control were studied systematically from 1987 to 1990.The main source of primary infection comes from pycnidiospores over-wintering in the residues of diseased plants.The released peak of pyc-nidiospores is from 26th,April to 9th,July.The cycle from infectionto producing new pycnidiospores is 10-12 days at 23-27℃ and 15-20 daysat 17-22℃.The stem rot expands in the collecting asparagus fieldthrough two stages,spreading stage(July to the first ten days of Au-gust)and prevailing stage(the middle ten days of August to September).The main factors that determine the disease development are rainy daysand the precipitation.A new infection peak appears usually in 5-7days after the precipitation,especially after a heavy rain or continualcloudy and rainy days.Dewing on plants is favourable for the germinfection in Autumn season.For chemical control of the disease theBefran from Japan and the Carbendazim GS made in our country arevery effective.
出处
《植物保护学报》
CAS
CSCD
北大核心
1992年第2期111-115,共5页
Journal of Plant Protection
关键词
芦笋
茎枯病
发生规律
防治
asparagus
stem rot
occuring regularity
control
