No.20 (1969)
MISAWA, T. & SATO, T. On the Susceptibility of Cucumber Varieties for Cucumber Mosaic Virus 122
TOGASHI, J. & SAKAMOTO, M. On the Temperature Condition Suitable for the Detection Erwinia aroideae from Soils by the Carrot Slice Method 138
FUJITA, K. & TOKI, A. Seasonal Prevalence and Economic Importance of Rice Stem Borer, Chilo suppressalis WALKER, in Aomori Prefecture 148
OYA, T. Seasonal prevalence of Rice Stem Borer, Chilo suppressalis WALKER, in Iwate Prefecture 157
ITO, H., IGARASHI, R., FUNABASAMA, K., SAI, T., & AZUMI, K. Outbreak of Brown Planthopper, Nilaparvata lugens STAL, in Miyagi Prefecture I. Distribution of Outbreak, Analysis of Damage and Countermeasures 166
CHIBA, B., HINO, G., & MIYAMOTO, K. Outbreak of Brown Planthopper, Nilaparvata lugens STAL, in Miyagi Prefecture II. Agro-meteorological Analysis on the Outbreak of the Insect 174
KOSHIHARA, T., & KAWABE, S. Relation of Temperature to the Development of the Green Rice Leafhopper, Nephotettix cinctieps UHLER, in the Tohoku District 181
FUSE, H. The Tobacco Cutworm, Prodenia lituraiFABRICIUSj, in the Shonai District 1. Note on the Occurrence 189