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오이 균핵병에 대한 몇 가지 살균제의 방제 효과와 살균제에 대한 균핵병균의 감수성 정도 조사
김명옥(Myeong Ok Kim),민지영(Ji Young Min),최우봉(Woo Bong Choi),강범관(Beum Kwan Kang),박성우(Sung Woo Park),최경자(Gyung Ja Choi),박창식(Chang Sik Park),조광연(Kwang Yun Cho),김흥태(Heung Tae Kim) 한국농약과학회 2005 농약과학회지 Vol.9 No.4
As Sclerotinia sclerotiorum causing cucumber sclerotinia rot was the fastest in the mycelial growth at 25℃, its pathogenicity was strong at the same temperature among several temperatures. All the isolates of Sclerotinia sclerotiorum showed a strong pathogenicity against cucumber fruits, which was confirmed by a disk assay and a wound assay. A wound assay was superior to a disk assay to develop the assay system for assessing the fungicidal activity of several fungicides against Sclerotinia sclerotiorum. In a disk assay, it was very difficult to assess the fungicidal activity, because the pathogenicity of isolates used in the experiment was very strong. At 500 and 3.0 ㎍/mL, the activity of dichloflouanid and the mixture of carbendazim and diethofencarb against cucumber sclerotinia rot was 14.3 and 42.3%, respectively, by using a disk assay. However, at same concentration two fungicides showed the high controlling activity as 100 and 92.5%, through a wound assay in a laboratory. Also, the activity of two fungicides was good against cucumber sclerotinia rot in the greenhouse where cucumber plants were cultivated in the field, showing the control value as 91.1 and 82.9% at 100 and 825 ㎍/mL, respectively. All the isolates of Sclerotinia sclerotiorum from cucumber fruits sampled in the polyvinyl house were subjected to monitoring for the resistance to 7 fungicides. The EC?? value of 7 fungicides was as follows: fenhexamid; 0.13 ㎍/mL, procymidon and iprodione; 0.18 and 0.24 ㎍/mL, carbendazim and the mixture of carbendazim and diethofencarb; 0.13과 0.05 ㎍/mL, iminoctadine and dichlofluanid; 1.94 and 8.95 ㎍/mL. Ultimately it was not found that resistant isolates of Sclerotinia sclerotiorum were appeared in the field.
살균제 chlorothalonil에 대한 고추 탄저병균의 감수성 변화
김준태(Joon Tae Kim),이경희(Kyeong Hee Lee),민지영(Ji Young Min),조인준(In Joon Cho),강범관(Beum Kwan Kang),박성우(Seong Woo Park),Nguyen Van Bach,김윤식(Yun-Sik Kim),홍성택(Hong Seong Taek),노창우(Chang Woo Rho),김흥태(Heung Tae 한국농약과학회 2004 농약과학회지 Vol.8 No.3
Monitoring for the sensitivity of Colletotrichum spp. causing red-pepper anthracnose to chlorothalonil was conducted by the agar dilution method, which were isolated from infected pepper fruits in 1999 and 2002. Among the isolates in 1999 or 2002, their sensitivity to fungicide was fluctuated. Investigating the inhibitory effect of 500 ㎍/㎖ of chlorothalonil on the mycelial growth of Colletotrichum isolates isolated from the infected red-pepper fruits in 1999, the frequency of isolates was 23.4%, which showed 100% of inhibitory effect on mycelial growth, and 29.7% showing below 60%. Isolates in 2002, however, showed 34.6% and 14.8% of inhibitory effect on PDAs including the same concentration of fungicide, respectively, These results showed that the sensitivity of Colletotrichum isolates in 1999 was inferior to that in 2002. According to the sampling region, isolation frequency among isolates in 2002 showing less MIC rather than 1999 was increased in Kyunggi, Kangwon, Kyungbuk and Kyungnam while the frequency of resistant isolates was done in Chungnam, Chungbuk, Cheonnam and Cheonbuk. Fungicide monitoring results in this report will be of use on controlling the anthracnose in each region cultivating red-pepper.