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
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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。Abstract: 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 0.61 μg/mL, and from 0.18 to 0.68 μg/mL,respectively, their 95% effective concentration (EC95) values lower than 3 μg/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 th e inhibition of the sporangium formation, zoospore cyst germination and sporangium germination, the EC50values were ranging from 0.03 to 6.15 μg/mL, and 0.07 to 1.97 μg/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(ο)-butanoylphenol, and ο-allphenol showed weak inhibition at the 4 stages.
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Key words:
- fungicides /
- Phytophthora capsici /
- inhibition
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