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烟草黑胫病菌(Phytophthoraparasiticavarnicotianae)对甲霜灵的敏感性测定结果表明:所测菌株菌丝生长对甲霜灵都存在不同程度的敏感性,Ec50值平均为0.2132μg/mL,Ec95值平均为6.5623μg/mL,但不同菌株对甲霜灵的敏感性不同,Ec50值范围在0.0573～0.8485μg/mL之间,相差15倍左右。Ec95值的范围在2.3393～21.8051μg/mL之间,相差9倍左右。其中以9734-1、9716-3和9706-2的耐药性最明显。甲霜灵对烟草黑胫病菌孢子囊的产生也有明显的抑制作用,5.0μg/mL的甲霜灵对烟草黑胫病菌的产孢抑制率为100%。通过甲霜灵对烟草黑胫病菌继代培养物的测定也证明了烟草黑胫病菌对甲霜灵的耐药性。
The results of sensitivity test of metalaxyl to Phytophthora parasitica: showed that the mycelial growth of the tested strains had different sensitivity to Metalaxyl, the average Ec50 value was 0.2132μg / mL and the Ec95 value was 6.5623 μg / mL, but different strains have different sensitivity to metalaxyl. The Ec50 values range from 0.0573 to 0.8485 μg / mL, a difference of about 15 times. Ec95 values range between 2.3393 ~ 21.8051μg / mL, a difference of about 9 times. Among them, the drug resistance of 9734-1, 9716-3 and 9706-2 is the most obvious. Metalaxyl also inhibited the production of sporangium of tobacco blackleg foci, and the inhibitory rate of 5.0μg / mL metalaxyl on the sporulation of tobacco blackleg was 100%. Metalaxyl on the tobacco black shank subcultures measured also proved Metarhizobium tobacco metalaxyl resistance.