【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0.14~0.61μg/mL和0.18~0.68μg/mL,EC95值均小于3μg/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0.03~6.15μg/mL和0.07~1.97μg/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。更多还原

【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 the （inhibition） of the sporangium formation, zoospore cyst germination and sporangium （germinat）ion, 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.更多还原