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Effect of a Bioactive Substance Extracted from Rheum undulatum on Control of Cucumber Powdery Mildew
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대황에서 추출한 생리 활성 물질의 오이 흰가루병 방제 효과

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Type
Academic journal
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Journal
Korean Society of Plant Pathology The Plant Pathology Journal Vol.12 No.1 KCI Accredited Journals SCIE
Published
1996.3
Pages
85 - 90 (6page)

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Effect of a Bioactive Substance Extracted from Rheum undulatum on Control of Cucumber Powdery Mildew
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Effect of wettable powder formulations (a.i., 30%) made of the extract of Rheum undulatum (RK) and a related standard chemical, 1,8-dihydroxy anthraquinone (AK), on control of the powdery mildew of cucumber caused by Sphaerotheca fuliginea, and their phytotoxicity on cucumber plants and toxicity on fish were investigated. In a polyethylene film house test, the formulated RK and AK fungicides showed 100 % control efficacy on the disease at 500 and 1,000 dilution concentrations, and in pot tests, their control efficacies were 75.0~100%, 67.0~75.0%, and 52.0~75.5% for AK, and 100%, 75.0~100% and 52.0~81.6% for RK at 2,000, 3,000 and 5,000 dilution concentrations, respectively. In a field trial, 4,000 and 5,000 dilution concentrations of AK and RK suppressed disease incidences by 72.3~90.0%. RK was not phytotoxic to cucumber plants up to the 250 dilution concentration, but AK showed phytotoxicity at the same dilution concentration. In the fish toxicity test, the doses for median tolerance limit (TLm) (50% survival for 48 hours) of these two formulations were exhibited above 2 ppm.
#cucumber #Sphaerotheca fuliginea #Rheum undulatum #1,8-dihydroxy anthraquinone #phytotoxicity #fish toxicity

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