Ecological Studies on the White Scab of Tea (Part 1):Relation between the Climatic Conditions and the Outbreak of the Disease

概要

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1. The relation between the climatic conditions and the outbreak of the white scab (Sphaceloma theae KUROSAWA), and in this connection some ecological characters of the disease were investigated. 2. Inoculation experiments and field observations showed that the fungus could invade young twigs and the six leaves from the top of the growing shoot, but most serious invasion occurred in the second to third leaves. 3. The incubation period of the disease was 2-4 days under the suitable environmental conditions. 4. Conidia were produced more numerously on the tea extract agar at a temperature of 15-20°C. and in the dark than in the light of fluorescent lamp or sun. 5. It seemed that the young leaves became more susceptible to the disease when exposed to a low temperature of about 10°C. for 1 or 2 days before inoculation, but a high humidity prior to infection gave little effect on the susceptibility of tea leaves. 6. From the inoculation experiments and the field observations, the temperature range favourable to the outbreak of the disease was 15-20°C. (daily average), and the fungus might invade the host tissue when a high humidity continued for 10-odd hours.
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