Leveillula taurica (Lév) Arn : cultures axéniques, biologie et spécificité parasitaire

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Abstract
L. taurica is distinguished from the other powdery mildews by the following: -Conservation of isolates is carried out on detached leaves (not on cotyledons) maintained on agar medium (100% relative humidity) on which the spores are deposited in a drop of water on the lower side of the blade (table I). For young tomato leaves, indole butyric acid (1 mg/l) should be added to the medium to prevent foliar necrosis (table II). -The spores germinate very well in liquid medium. Several fungicides have been tested under these conditions: even at high concentrations, non of them have proved to be really efficient (table III). -A special microscopic technique has shown that the germinative tubes enter via stomata (fig 1). However, they seem to play a minor role in contamination. For artificial contamination in the greenhouse, the plants are sprayed with liquid inoculum. It is necessary to place the material in a damp chamber. The results obtained from cross-infections (4 isolates using on 5 host plants) suggest that there is no parasitic specificity (table IV). The different characteristics noted above are discussed.

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