摘要
黄瓜黑星病菌以菌丝体在病残株内于田间或土中越冬,成为第二年初侵染来源。黄瓜种子内的菌丝也可越冬,带菌率最高可达37.76%。种子各部位均可带菌,以种皮为多。接种试验证明黄瓜黑星病菌主要是从叶、茎、果实的表皮直接穿透侵入,也可从气孔或伤口侵入,但极少。黄瓜黑星病菌的分生孢子产生必须具备90%以上的相对湿度(RH)和15℃以上的日平均温度。分生孢子在5—30℃下均可萌发,适温15—25℃,但萌发必须有水滴,在无水滴的情况下即使RH达100%也不能萌发。吉林省大棚内发病重是由于5月中旬以后棚温达到黑星病菌生长的温度范围,RH长时间(12小时以上)在90%以上。露地黄瓜黑星病的发生则与当年的降雨量和降雨日数多少有关。大棚内采用降低湿度的生态防治措施,可有效地控制病情,从而减少喷药次数而达到防治目的。
The pathogen of cucumber scab could survive on diseased plants and
seeds which were the sources of primery inoculum next year,The
pathogen was found in all parts of seeds,Good result of control were
obtained with hot water treatment of seeds for 15 minutes at 55℃ or
with soaking in 50% MBC at 1:500 dilution for 20 minutes,The germ
tubes of conidia can penetrate the epidemis directly and also can pass
through the stomata or through the wound.
High humidity favours sporulation and spore germination and in-
fection to cucumber plants,Under the plastic film net houses,high hu-
midity caused the epidemic of the disease during June and July,In field,
the rain fall and rain days are the most important conditions for the
disease epidemic.Reducing the humidity as a ecologic method could used
to control this disease.
出处
《植物保护学报》
CAS
CSCD
北大核心
1991年第3期273-278,共6页
Journal of Plant Protection
