발병 조건에 따른 fludioxonil의 상추 잿빛곰팡이병 방제효과 (Control Efficacy of a New Fungicide Fludioxonil on Lettuce Gray Mold According to Several Conditions)

서지정보

· 발행기관 : 한국식물병리학회
· 수록지 정보 : 식물병 연구 / 15권 / 3호 / 217 ~ 221페이지
· 저자명 : 최경자, 장경수, 최용호, 김진철

초록

Fludioxonil is derived from the antifungal compound pyrrolnitrin produced by Pseudomonas pyrrocinia and
classified as a reduced-risk fungicide by the US EPA. The efficacy of fludioxonil for the control of lettuce gray
mold caused by Botrytis cinerea was evaluated under several conditions such as growth stages of host, inoculum
concentrations, and amounts of potato dextrose broth (PDB) included in spore suspension of B. cinerea.
At 4-leaf stage of lettuce plants, fludioxonil applied at 2 μg/ml was more effective for the control of gray mold
than at 5- and 6-leaf stages. However, fludioxonil at more than 10 μg/ml provided similar control activity in all
growth stages of lettuce tested. The fungicide (10 and 50 μg/ml) also gave excellent control of gray mold on lettuce
seedlings inoculated with spore suspensions of B. cinerea (2.5×105 to 2×106 spores/ml). But, control efficacy
of fludioxonil (2 μg/ml) was negatively correlated with inoculum concentration. Addition of PDB in
spore suspension of B. cinerea resulted in higher disease severity than non-treated control. By inoculating
spore suspension including 0.5% PDB, the fungicide gave the most control activity on the disease, followed by
1% and 2% PDB. The results suggest that fludioxonil has potential to control gray mold of lettuce, but the
fungicide at a concentration having moderate activity may represent low control efficacy on the disease under
some conditions.

영어초록

Fludioxonil is derived from the antifungal compound pyrrolnitrin produced by Pseudomonas pyrrocinia and
classified as a reduced-risk fungicide by the US EPA. The efficacy of fludioxonil for the control of lettuce gray
mold caused by Botrytis cinerea was evaluated under several conditions such as growth stages of host, inoculum
concentrations, and amounts of potato dextrose broth (PDB) included in spore suspension of B. cinerea.
At 4-leaf stage of lettuce plants, fludioxonil applied at 2 μg/ml was more effective for the control of gray mold
than at 5- and 6-leaf stages. However, fludioxonil at more than 10 μg/ml provided similar control activity in all
growth stages of lettuce tested. The fungicide (10 and 50 μg/ml) also gave excellent control of gray mold on lettuce
seedlings inoculated with spore suspensions of B. cinerea (2.5×105 to 2×106 spores/ml). But, control efficacy
of fludioxonil (2 μg/ml) was negatively correlated with inoculum concentration. Addition of PDB in
spore suspension of B. cinerea resulted in higher disease severity than non-treated control. By inoculating
spore suspension including 0.5% PDB, the fungicide gave the most control activity on the disease, followed by
1% and 2% PDB. The results suggest that fludioxonil has potential to control gray mold of lettuce, but the
fungicide at a concentration having moderate activity may represent low control efficacy on the disease under
some conditions.

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