Factors Affecting the Regional Difference of the Frequency of Generations of the Mulberry Scale, Pseudaulacaspis pentagona TARGIONI, Parasitic on Tea Plants

概要

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1. This investigation was made to determine whether the difference of the frequency of generations of the mulberry scale parasitic on tea plants depends on species that was pointed out by KAWAI or the temperature stated by BAN.<BR>2. The mulberry scale collected from districts in Nara, Shiga, Shizuoka, Kyoto was proved to be same as "Pseudaulacaspis pentagona" pointed out by KAWAI. Above result shows that the difference of the frequency of generations is not due to species.<BR>3. At Tea Branch, Nara P refectural Agricultural Experiment Station, where two generations took place a year, the annual average temperature was 12.7°C, while in Nara Foundation Tea Stock Farm (Ministry of Agriculture and Forestry), where three generations were seen yearly, it was 14.6°C, so the difference between them is about 2°C.<BR>4. From the result of this investigation together with many reports showingthat temperature causes the difference of frequency of generations, it is assumed to be concluded that temperature is a important factor affecting the regional difference of the frequency of generations of the mulberry scale parasitic on tea plants.
日本茶業技術協会の論文