20种杀菌剂对芦笋茎枯病菌的抑制作用及联合毒力

Toxicities of 20 Fungicides and Co-toxicities between Propiconazole or Azoxystrobin and Difenoconazole on Phomopsis asparagi

采用菌丝生长速率法测定20种杀菌剂对芦笋茎枯病菌的抑制作用以及苯醚甲环唑和丙环唑、苯醚甲环唑和嘧菌酯混配后对芦笋茎枯病菌抑制作用的联合毒力。结果表明,咪鲜胺、苯醚甲环唑、氟环唑、戊唑醇、百菌清、噻菌灵对芦笋茎枯病菌的抑制作用强,其中咪鲜胺的毒力最高,EC50为0.035 5mg.L-1,而代森锰锌、噁霉灵、福美双、嘧霉胺、井冈霉素、硫酸铜钙和氨基寡糖素对芦笋茎枯病菌抑制作用较弱。苯醚甲环唑和丙环唑按照1∶1的比例混配后对芦笋茎枯病菌菌丝生长抑制作用的共毒系数(CTC)为123.42,表现为增效作用。苯醚甲环唑与嘧菌酯按照8∶5、1∶5、1∶8的比例混配后抑制芦笋茎枯病菌菌丝生长的CTC分别为164.17、132.91、141.91,也表现为增效作用,其中8∶5混配后增效作用最显著。

Toxicities of 20 fungicides and co-toxicities between propiconazole or azoxystrobin and difenoconazole on Phomopsis asparagi were determined by the pathogen′s mycelium growth rates under treatments.The results showed that prochloraz,difenoconazole,epoxiconazole,tebuconazole,chlorothalonil and thiabendazole had higher toxicities among all,with prochloraz being the strongest showing an EC50 of 0.035 5 mg·L-1.Mancozeb,hymexazol,thiram,pyrimethanil,jinggangmycin,copper calcium sulphate and oligosaccharin were not as potent.The co-toxicity efficient（CTC） between difenoconazole and propiconazole（1∶1） was 123.42,suggesting existence of synergism.The synergisms between difenoconazole and azoxystrobin,on the other hand,were reflected by the CTCs of 164.17,132.91 and 141.91 when their mixing ratios were 8∶5,1∶5 and 1∶8,respectively.