胺苯吡菌酮和叶菌唑混配对5种花卉病菌的联合毒力研究
Studies on Co-toxicity of Fenpyrazamine/Metconazole　Complex against Five Species Diseases in Flower

为寻求防治花卉病害的高效、低毒杀菌剂，采用室内毒力测定方法，以玫瑰锈病菌、文竹叶斑病菌、郁金香灰霉病菌、菊花褐斑病菌和茶花炭疽病菌为测试菌株，研究胺苯吡菌酮和叶菌唑混配对5种花卉病害的联合毒力作用。结果显示：当叶菌唑和胺苯吡菌酮的混配比例为5∶1时，对玫瑰锈病菌的共毒系数为188.16；混配比例为10∶1时，对文竹叶斑病菌的共毒系数为198.07；混配比例为1∶1时，对郁金香灰霉病菌的共毒系数为190.29,对菊花褐斑病菌的共毒系数为192.55；混配比例为3∶1时，对茶花炭疽病菌的[JP3]共毒系数为200.04。表明胺苯吡菌酮和叶菌唑按适当比例混配对此5种花卉病原菌菌丝和孢子具有明显抑制作用。
In order to seek high efficiency and low toxicity fungicide for preventing and controlling the diseases in flowers.The co-toxicity of fenpyrazamine,metconazole and its mixture against rust germs rose,the plaque bacteria Zhuyeshan, tulip gray country bacteria,daisy-chained speckle disease and daisy-chained speckle disease were studied. The co-toxicity of fenpyrazamine/metconazole complex against five species diseases in flowers was studied based on combination toxicity. Bioassay results showed that the co-toxicity cofficient (CTC) against mycelial growth of rust germs rose were 188.16 when ratio of the mixture of fenpyrazamine and metconazole was 5∶1；the CTC against mycelial growth of plaque bacteria Zhuyeshan was 198.07 when the ratio of the mixture was 10∶1; the CTC against mycelial growth of tulip gray country bacteria and daisy-chained speckle disease were 190.29 and 192.55 respectively when the ratio of the mixture was 1∶1 ; CTC against mycelial growth of daisy-chained speckle disease was 200.04 when the ratio of the mixture was 3∶1.The results suggested that fenpyrazamine and metconazole had significant inhibited activity against hyphae and spores of 5 species diseases in flower when mixtures of appropriate ratio were used.