Effect of temperature on the appearance of symptoms of mulberry mosaic disease

(II) Comparative observations on enation and filiform of mulberry plants

Abstract

We have compared on the kinds and intensity of symptoms appeared under the different temperatures, i.e., 15°, 23° and 30°C, between the filiform and the enation of mulberry plants, characteristic to mulberry mosaic disease.
On the filiform materials, conspicuous filiform symptoms and some ring spots developed, but nothing showed enation symptoms. On the other hand, enations, ring spots and yellowing spots were shown from the enation materials, while filiform symptoms did not developed from them.
Effect of temperature on the intensity of symptoms was very different between the enation and filiform materials. On the enation materials collected from Gumma Prefecture, severe symptoms developed when the plants were kept at 23° and 15°C, but no symptom at 30°C, although the enation materials from Shiga Prefecture showed symptoms so slightly that could not discuss the relationships between symptom appearance and temperature.
On the filiform materials, symptoms developed severely at 23° and 30°C, and the intensity of symptoms on plants kept at 23°C was higher than those at 30°C, but when plants were grown at 15°C, symptoms were almost masked.