Influence of Leaf Position and Maturity on Development ofBotrytis squamosain Onion Leaves

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Abstract
Onion plants inoculated with dry conidia of B. squamosa, then incubated in a dew chamber at 20.degree. C for 24 h, displayed, from youngest (innermost) to oldest (outermost) leaves: increasing numbers of lesions, increasing mean lesion areas and increasing mean lengths of infection hyphae. Lesion area was not significantly correlated with lengths of infection hyphae within lesions after inoculation and subsequent incubation in a dew chamber at 20.degree. C for 24 h. In most lesions, hyphal development was restricted. Lesions developed rapidly, within 24 h after inoculation, although the rate of development was greater on the older leaves than on the younger ones. Growth of infection hyphae within senescent tissues was about 3 times faster than in nonsenescent tissues on the same leaf.

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