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KMID : 0903619920330020146
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Journal of the Korean Society for Horticultural Science
1992 Volume.33 No. 2 p.146 ~ p.155
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Studies on Alternaria Leaf spot (A . mali Roberts) in Apple Trees (Malus domestica Borkh .) : Epiphytotics , Screening Methods and Inheritance of Resistance
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Abstract
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In order to obtain the basic data for the breeding of the resistant varieties to Alternaria leaf spot caused by Alternaria malt Roberts, studies on the pathogenicity of isolates collected from different localities, varietal differences in the seasonal disease occurrence in the fields were carried out. Results obtained are summarized as follows:
1. Among 19 isolates collected from six different localities, 7 isolates from four localities developed symptoms in ´Starlaimson´.
2. No lesions were developed on ´Jonathan´ leaves by the dropping inoculation on intact leaf surface, while symptoms were developed on the leaves of ´Starkrimson´ from the 1st through 8th leaf orders. When artificial injuries were made before inoculation, the 1st through 15th leaf orders in ´Starkrimson´ were infected, whereas the range was confined to the 1st through 4th leaf orders in ´Jonathan´. By spraying the inoculum on the intact surface, ´Jonathan´ leaves were not infected, while ´Starkrimson´ leaves were infected from the 1 st through 10th leaf orders.
3. Varietal difference was observed in both seasonal and accumulated disease occurrence in the fields.
4. Vigorous growth and 3 ㎜ diameter symptom were observed 48 hours after dropping inoculation on ´Indo´ leaves, while no mycelial growth and healthy leaf surface observed on ´Jonathan´ leaves. Penetration of A. malt through the stomata was observed in ´Indo´ leaves on which A. malt inoculum was previously dropped.
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