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Evaluation of Fungicides for Preventive and Curative Effects against Powdery Mildew on Oriental Melon
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 Title & Authors
Evaluation of Fungicides for Preventive and Curative Effects against Powdery Mildew on Oriental Melon
Chang, Tae-Hyun; Ryu, Yeon-Ju; Lim, Hye-Jung; Lim, Su-Jin; Choi, Mi-Young; Jeong, Byeong-Ryong; Kim, Cheol-Woong; Lee, Yong-Se;
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 Abstract
Fungicides including keroxym-methyl (strobilurin fungicide), fenarimol and trifulmizole (DMI, boscalid (anilide) and metrafenone (benzophenone) were evaluated for preventive and curative efficacies against powdery mildew on oriental melon. The fungicides were applied preventatively at 7 days, 3 days and 3 hours before inoculation. Curative applications were made by applying fungicides three times at the interval of one week when infected leaves by powdery mildew were about 16% or 30%. Then preventative and curative efficacies were evaluated one week after inoculation and final application, respectively. Boscalid and metrafenone showed preventive efficacies of 74.3 and 68.3% against powdery mildew development respectively, when treated at 7 days before inoculation. They showed 89.4 and 87.2% efficacies when treated at 3 days before iniculation and 98.5 and 93.2% at 3 hours before inoculation respectively. However, there were no preventive efficacies in kresoxym-methyl, triflumizole and femarimol (DMI fungicides) when trebled at both 7 and 3 days before inoculation. At the preventive treatment 3 hours before inoculation, they indicated 59.0, 42.5, and 37.2% efficacies, respectively. When leaves were infected about 30% by powdery mildew, curative application of boscalid and metrafenone showed 85.9 and 74.0% of efficacies, respectively. Curative efficacies of kresoxym-methyl, tiflumizole and fernarimol were 5.5, 23.0 and 46.7% respectively. When leaves were infected about 16%, curative application of boscalid and metrafenone showed 100 and 97.5% of efficacies, respectively. However, the triflumizole and fernarimol showed relatively low curative efficacies of 30.8 and 51.6%, respectively. Microscopic observation of mycelial growth and conidia formation after detection of powdery mildew disease indicated lysis of mycelium and these lysis suppression of conidia formation showed tendency in accordance with curative efficacies of fungicides.
 Keywords
oriental melon;powdery mildew;Sphaerotheca fuliginea;keroxym-methyl;fenarimol;trifulmizole;boscalid;metrafenone;
 Language
Korean
 Cited by
1.
시설재배 참외 중 살균제의 생물학적 반감기,이주희;전영환;신갑식;김효영;박은정;김태화;김장억;

한국환경농학회지, 2009. vol.28. 4, pp.419-426 crossref(new window)
2.
Strobilurin계 살균제의 시설재배 참외 중 잔류 양상,박은정;이주희;김태화;김장억;

한국환경농학회지, 2009. vol.28. 3, pp.281-288 crossref(new window)
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