摘要
引起云南省灯盏花根腐病的病原为茄病镰刀菌(Fusarium solani)、尖孢镰刀菌(F.oxysporum)和半裸镰刀菌(F.semitectum)3种真菌,茄病镰刀菌和尖孢镰刀菌为灯盏花根腐病的2种新病原,其中茄病镰刀菌为主要致病菌,其分离率为42.86%,茄病镰刀菌有伤接种发病率为70%,无伤接种发病率为56.7%。采用室内生长速率法测定了50%多菌灵可湿性粉剂、70%甲基硫菌灵可湿性粉剂、64%恶霜·锰锌可湿性粉剂、10%苯醚甲环唑水分散粒剂、10亿活芽胞/g枯草芽胞杆菌·荧光假单胞杆菌可湿性粉剂5种供试杀菌剂对灯盏花根腐病主要病原茄病镰刀菌的毒力。结果表明:5种供试药剂对茄病镰刀菌都有抑制作用。对茄病镰刀菌的有效中浓度(EC50)分别为0.000 4、0.050 7、0.053 5、0.081 3和8.624 0mg/mL,其中50%多菌灵可湿性粉剂有效中浓度最低,相对抑制效果最好。5种药剂的毒力相关系数均在0.89以上,表明药剂质量浓度与抑制作用呈较高相关性。
The three pathogens causing root rot of Erigeron breviscapus in Yunnan Province were identified as Fusarium solani,F.oxysporum and F.semitectum,among which F.solani and F.oxysporum were two new pathogens; the main pathogen was F.solani,and the isolation frequency was 42.86%.After artificial inoculation with or without wounds,the incidence of roots infected by F.solani was 70% and 56.7%,respectively.With mycelium growth rate test method,five fungicides to F.solani had inhibition effects,indicating that the ECs0 values of 50% carbendazim WP,70% thiophanate-methyl WP,64% oxadixyl · mancozeb WP,10% difenoconazole WG,and 1 billion live spores of Bacillus subtilis and Pseudomonas fluorescens WP were 0.000 4 mg/mL,0.050 7 mg/ mL,0.053 5 mg/mL,0.081 3 mg/mL and 8.624 0 mg/mL,respectively,suggesting that 50% carbendazim WP was the best.The correlation coefficients for the five fungicides were all above 0.89,indicating that mass concentration had high correlation with inhibition.
出处
《植物保护》
CAS
CSCD
北大核心
2014年第2期141-145,150,共6页
Plant Protection
基金
云南省教育厅科研基金(0111343)
福建省重点引智项目(SZ2011037)
关键词
灯盏花
根腐病
病原鉴定
毒力测定
致病性
Erigeron breviscapus
root rot disease
identification of pathogen
toxicity test
pathogenicity