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为筛选出有效防治番茄叶霉病的药剂,采用生长速率法及平板涂布法测定6种三唑类杀菌剂对番茄叶霉病菌菌丝生长及分生孢子萌发和芽管伸长的毒力,评价其对番茄植株的安全性和对叶霉病的田间防效。结果表明,己唑醇、苯醚甲环唑、戊唑醇和氟硅唑对番茄叶霉病菌菌丝生长的毒力均较高,EC_(50)分别为0.50、0.55、0.80、2.42 mg/L,其次为腈菌唑和四氟醚唑,EC50分别为6.92、15.08 mg/L。6种杀菌剂抑制病菌分生孢子萌发及芽管伸长的作用均较弱,对芽管伸长的抑制活性高于对孢子萌发的抑制活性;戊唑醇和四氟醚唑抑制孢子萌发的作用相对较强,100 mg/L处理的抑制率为60%~70%,戊唑醇、四氟醚唑和己唑醇抑制芽管伸长的作用相对较强,100 mg/L处理的抑制率均在70%以上。己唑醇和戊唑醇200 mg/L处理番茄植株,显著抑制其株高,苯醚甲环唑和腈菌唑对其影响相对较小,这4种杀菌剂对番茄植株的叶色及形态均无明显影响;且这4种杀菌剂对番茄叶霉病的田间预防效果均高于治疗效果,其中150 mg/L己唑醇的预防效果和治疗效果均最高,分别为90.67%和85.58%;苯醚甲环唑的最低,300 mg/L时预防效果为80.16%,治疗效果为71.68%。
In order to screen out the effective control of tomato leaf mold disease, the growth rate method and the plate coating method to determine the 6 kinds of triazole fungicides on tomato leaf mold mycelial growth and conidia germination and germination tube elongation virulence , Evaluate their safety on tomato plants and field control of leaf mold. The results showed that the virulence of hexaconazole, difenoconazole, tebuconazole and flusilazole on mycelial growth of Fulvia fulva were higher, with EC50 of 0.50, 0.55, 0.80 and 2.42 mg / L, respectively , Followed by myclobutanil and tetraconazole, with EC50 of 6.92 and 15.08 mg / L, respectively. The fungicides inhibited the germination of conidia and germ tube elongation were weak, the inhibitory activity of germ tube elongation was higher than that of spore germination; tebuconazole and tetrafluoroether inhibition of spore germination The inhibitory rate of 100 mg / L treatment was 60% -70%. Tebuconazole, tetrafluidzole and hexaconazole showed relatively strong inhibitory effects on the elongation of germ tube. The inhibitory rates of 100 mg / L Above 70%. Hexaconazole and tebuconazole 200 mg / L treatment of tomato plants significantly inhibited the plant height, difenoconazole and myclobutanil on its relatively small impact, the four fungicides on tomato leaf color and morphology were The four prophylactic fungicides against tomato leaf blight were higher than the therapeutic effect. The preventive and curative effects of hexaconazole at 150 mg / L were the highest (90.67% and 85.58%, respectively). Difenoconazole the lowest, 300 mg / L prevention effect was 80.16%, the treatment effect was 71.68%.