杀菌剂对辣椒疫霉不同形态菌体的毒力差异  

Virulence Difference of Fungicides against Phytophthora capsici at Different Stages

作　　者：尹敬芳[1] 曹锦[1] 李健强[1] 刘西莉[1] 

机构地区：[1]中国农业大学植物病理学系,北京100094

出　　处：《农药学学报》2005年第3期227-232,共6页Chinese Journal of Pesticide Science

基　　金：国家高技术研究发展计划(2002AA244041);国家科技攻关项目(2004BA521B04;2002BA516A08);教育部"新世纪优秀人才支持计划"项目(NCET-04-0128)

摘　　要：室内离体条件下测定了9种杀菌剂对辣椒疫霉各生长阶段的抑制作用.结果表明:烯酰吗啉和氟吗啉对所测定的菌株P1319 4个发育阶段均有显著的抑制作用,EC50值分别为0.14～0.61 μg/mL 和0.18～0.68 μg/mL,EC95值均小于3 μg/mL;甲霜灵对菌丝生长和孢子囊形成有显著的抑制作用,但对休止孢和孢子囊萌发基本无影响;嘧菌酯和百菌清强烈抑制孢子囊形成、休止孢和孢子囊萌发,EC50值分别为0.03～6.15 μg/mL和0.07～1.97 μg/mL;较高浓度的代森锰锌可以抑制辣椒疫霉的孢子囊形成、休止孢萌发和孢子囊直接萌发,但对菌丝生长无抑制作用;三乙膦酸铝、p(ο)-丁酰基苯酚和邻-烯丙基苯酚对P1319的4个发育阶段的抑制作用较弱.The bioactivity of 9 fungicides against different stages of Phytophthora capsici was compared in vitro. The results showed that dimethomorph and flumorph had significant inhibitory effect on the 4 different growth stages of the target pathogen（P1319）, with 50% effective concentration （EC50） values ranging from 0.14 to 0.61μg/mL, and from 0.18 to 0.68μg/mL,respectively, their 95% effective concentration （EC95） values lower than 3μg/mL. Metalaxyl could significantly inhibit the mycelial growth and sporangium formation, however, it had no inhibitory effect against zoospore cyst germination and sporangium germination. Azoxystrobin and chlorothalonil strongly exhibit the inhibition of the sporangium formation, zoospore cyst germination and sporangium germination, the ECsovalues were ranging from 0.03 to 6.15μg/mL, and 0.07 to 1.97μg/mL. Higher concentration mancozeb posessed inhibition on sporangium formation, zoospore cyst germination and sporangium germination, but without any activity on mycelial growth of P. capsici. Fosetyl-aluminium, p （o）- butanoylphenol, and o-allphenol showed weak inhibition at the 4 stages.

关 键 词：杀菌剂 辣椒疫霉 抑制作用 

分 类 号：S482.2[农业科学—农药学]