几种杀菌剂对番茄灰霉病菌的毒力及田间防效的研究

Toxicity and Field Control Efficiency of Several Fungicides Against Botrytis cinerea

摘要: 采用菌丝生长速率法测定6种杀菌剂以及腐霉利与福美双混配对番茄灰霉病菌的抑制作用,并测定7种杀菌剂对番茄灰霉病菌的田间药效。结果表明,百菌清、异菌脲、腐霉利对番茄灰霉病菌的抑制作用较强,其中百菌清的抑制作用最强,EC50为0.52mg.L-1;腐霉利和福美双原药以5∶1、1∶3、1∶5混配后对番茄灰霉病菌菌丝生长抑制作用的共毒系数(CTC)分别为121.44、124.22、128.46,均表现为增效作用。田间药效试验结果表明,50%腐霉利WP 562.5g.hm-2、25%啶氧菌酯SC 112.5g.hm-2、50%啶酰菌胺WG 300g.hm-2 3种杀菌剂对番茄灰霉病防治效果较好,防效均在75%以上。

Abstract: Toxicity of 6fungicides and co-toxicities between procymidone and thiram on Botrytis cinerea were determined by measuring the growth rate of mycelia,and the control efficiency of 7fungicides against grey mould of tomato in the field were also studied.The results showed that chlorothalonil,iprodione and procymidone have higher toxicity to the fungus,and chlorothalonil has the best toxicity(EC50=0.516 6mg.L-1).The synergism between procymidone and thiram with different mixing ratios(5∶1,1∶3and 1∶5)were 121.44,124.22and 128.46indicated by CTCs respectively.Furthermore,the field control efficacy of pocymidone 50% WP(562.5 g.hm-2),picoxystrobin 25%SC(112.5g.hm-2),boscalid 50%WG(300g.hm-2)were all above 75%.