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Ecology and control strategy of powdery mildew of cucurbits

Ecology and control strategy of powdery mildew of cucurbits

Plant Protection Bulletin (Taichung) 34(2): 139-148

According to the characteristics of the Oidium state, Sphaerotheca fuliginea was identified as the causal agent of cucurbits powdery mildew in southern Taiwan. Its sexual stage has not been found so far. Conidia are formed in chain, ellipsoid, 225 apprx 55 times 10 apprx 25 mu-m in size, and 87.33% of conidial cell containing fibrosin bodies. Cross inoculation showed that the powdery mildew fungus collected from cosmos (Cosmos bipinnatus), mungbean (Phaseolus aureus) and azuki bean (Phaseolus angularis) could infected detached leaves of calabash gourd (Lagenaria siceraria). Conidia germinate well on slides coated with 2.5% cellulose acetate. It was found that conidium germination needs a higher relative humidity above 95%. The optimum temperature for conidium germination was from 15 to 30 degree C. The powdery mildew of cucurbits could develop over a wide temperature range and the optimum temperature was 25 degree C. Conidiophores and conidia are produced on cucumber leaves within 4 days after inoculation at 25 degree C. The conidia of S. fuliginea survived for one week at 25 apprx 30 degree C, two weeks at 15 apprx 20 degree C, three weeks at 5 apprx 10 degree C, and were decreased at 35 degree C or over. The susceptibilities of 15 varieties of melon (Cucumis melo), cucumber (Cucumis sativus), pumpkin (Cucurbita moschata), calabash gourd and luffa (Luffa aegyptiaca) to the powdery mildew have been evaluated, many varieties of melon, cucumber and pumpkin showed high susceptibility and the varieties of calabash gourd and luffa were tolerant. The study of fungicidal resistance of powdery mildew fungi was carried out by incorporating fungicides into a cellulose acetate coating on glass slides for conidial germination tests. Results showed that some isolates have a high degree of resistance to imazalil, karathane, afugan, and ethirmol. This paper also reviewed the ecology and control of powdery mildew of cucurbits.

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Accession: 002351393

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