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ISSN 1511-3701

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Effect of Irradiance on Growth, Physiological Processes and Yield of Melon (Cucumis melo) Plants Grown in Hydroponics

Mohd Razi Ismail and Mohd Kamil Yusof

Pertanika Journal of Tropical Agricultural Science, Volume 19, Issue 2&3, December 1996

Keywords: Collet otrichum gloeosporioides, Malaysian hosts, anthracnose, pathogenicity

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Colletotrichum gloeosporioides from eighteen Malaysian hosts, namely mandarin orange (Citrus reticulata ), cacao (Theobroma cacao), an orchid (Cattleya sp.), pepper (Piper nigrum ), chilli (Capsicum annum ), grass (Im p e ra ta cylindrica ), mango (Mangifera indica) and legume cover crops (P u e ra ria phaeseoloides, Centrosema pubescens, and Calopogonium mucunoides) and a weed (Mimosa p u d ic a ), vegetables (Psophocarpus tetragonolobus, Phaseolus vulgaris, Vigna ra d ia ta , Vigna sesquipedalis and Arachis hypogaea), a shrub (Leucaena leucocephala) and a herbaceous vine (Clitoria ternatea ) were examined fo r colony growth characteristics, morphology o f conidia, growth on various media and temperatures and pathogenicity on Phaeseolus bean hypocotyls. Conidium size o f Colletotrichum gloeosporioides was 14.25-19.0 x 2.7-5.03 fim. The appressorium size was 6.34-10.08 x 5.28-7.31 fim and the shape was globose/sub-globose/lobed. No correlation between the appressorium size and shape was noticed. The optimum temperature fo r growth was 28 and 30°C. None o f the isolates caused infection symptoms on Phaseolus bean hypocotyls.

ISSN 1511-3701

e-ISSN 2231-8542

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