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[目的]筛选有效生物制剂,减少化学农药使用量。[方法]采用菌丝生长法测定7种生物制剂对致病疫霉的毒力。[结果]甲壳胺、乙蒜素和申嗪霉素对致病疫霉具有良好的抑制效果。申嗪霉素的毒力最强,EC_(50)值为2.0243(A1)、1.0028 mg/L(A2),乙蒜素次之,甲壳胺的抑菌效果最差。田间试验中,乙蒜素和申嗪霉素防治效果显著,分别为71.42%和69.63%,甲壳胺次之,防效为52.61%。[结论]申嗪霉素和乙蒜素杀菌效果显著,甲壳胺杀菌效果不显著但具有诱导抗病效果。3种生物制剂可有效防治马铃薯晚疫病。
[Objective] To screen effective biological agents and reduce the use of chemical pesticides. [Method] The mycelial growth method was used to determine the virulence of seven biological agents against Phytophthora infestans. [Result] Chitosan, allicin and sizincimycin had a good inhibitory effect on Phytophthora infestans. The most virulent of the isomentin, EC50 (50) values of 2.0243 (A1), 1.0028 mg / L (A2), followed by ethidium, chitosan antibacterial effect of the worst. In field trials, the control effect of allicin and sizindamycin was significant, which was 71.42% and 69.63%, respectively, followed by chitosan, with the control effect being 52.61%. [Conclusion] The antibacterial effect of sodiazmycin and ethidium was significant, while the disinfection effect of chitosan was not significant but it had the effect of inducing disease resistance. Three kinds of biological agents can effectively prevent potato late blight.