No.34（1983）

TSUZUKI, H. : Ecology of the rice water weevil and its chemical control 1

IITOMI, A., DOBASHI, S. and SATOH, Y. : Tolerable density level of white-backed planthopper, Sogatella furcifera Horvath, for rice plant in Akita prefecture 6

SATOH, Y., DODBSHI, S., and IITOMI, A. : Catch of smaller rice leaf miner, Hydrellia griseola Fallen, by tow net trap and light trap 9

TOMIOKA, T., OKUYAMA, S. and HACHIYA, K. : Two species of Hydrellia infesting rice leaf in Hokkaido 11

TOMIOKA, T. : Ecological note on two species of Hydrellia 13

SAITO, M., OHSAWA, S., HIKICHI, N., INOMATA, M., SUZUKI, K. and TAIRA, T. : Occurrence of rice water weevil, Lissorhoptrus oryzophilus kuschel （Coleoptera : Curculionidae）, in Fukushima prefecture 17

KOBAYASHI, M. and SUZUKI, T. : Seasonal prevalence of rice water weevil （Lissorhoptrus oryzophilus Kuschel） in Iwate prefecture in 1982 and its possible course of invasion 20

SAITO, T., EGUCHI, N. and SHOJI, T. : Invasion of the rice water weevil, Lissorhoptrus oryzophilus Kuschel, in Yamagata prefecture 23

OKUYAMA, S., HARUKI, T. and HACHIYA, K. : On the injury of wheat grains by the rice leaf bug, Trigonotylus colestialium Kirkaldy, in Hokkaido 26

MIYAHARA, Y. : Rearing of the oriental corn borer, Ostrinia furnacalis Guenee, on artificial diet 2. Fertility of female moths 30

FUSE, H. and SATO, M. : Recent increase of soybean seed damages by defoliators and their control in Shonai plain 33

SATO, M. and FUSE, H. : Damege of soybean by the two-striped leaf beetle, Medythia nigrobilineata Motschulsky, and its control by insecticides 37

HIRAI, K. and MIYAHARA, Y. : A note on Diadegma sp. （Hymenoptera : Ichneumonidae）, a parasite of the soybean pod borer, collected from the northern part of Japan 40

AKIYAMA, Y. : Studies on flea beetles of sugar beet Ⅷ. On the character of severely injured regions and the overwintering circumstances of the adult 42

AKIYAMA, Y. : Studies on flea beetles of sugar beet Ⅸ. Seasonal occurrence of the adult flea beetle on some cultivated and wild plants 45

TORIKURA, H. : Notes on the potato infesting aphid, Aphis gossypii Glover, in Hokkaido 47

CHIBA, T. : Seasonal prevalence of the garden pea leafminer, Phytomyza horticola Goureau （Diptera : Agromyzidae）, on spring field pea and the control by application of some insecticides 50

YAGINUMA, K. KANNO, K. and KUMAKURA, M. : Control of cotton aphid （Aphis gossypii Glover） by application of insecticides 53

YAMADA, M. and KAWASHIMA, K. : Selective effect of insecticides for the control apple golden leaf miner, Phyllonorycter ringoniella Matsumura 55

TORIKURA, H. : Notes on the grass-cutting noctuid, Apamea lateritia Hufnagel 59

MATSUDA, K. and MATSUO, H. : Host plants of salicaceae-feeding leaf beetles 61

AMANO, K. : Studies on biology of the yellow dung fly, Scatophaga stercoraria L. （Diptera : Scatophagidae） I . Effects of temperature on the growth and development 64

AMANO, K, : Studies on biology of the yellow dung fly, Scatophaga stercoraria L. （Diptera : Scatophagidae） II . Seasonal prevalence and occurrence of overwintering generation in a pasture 66

INAOKA, T. and MATSUDA, T. : Species composition and daily fluctuation of blood-sucking activity of tabanid flies in Ebetsu, Hokkaido 69

HAYAKAWA, H. and HASEGAWA, T. : Dung beetles collected from cattle feces at Okinawa islands 71

HAYAKAWA, H. and INAOKA, T. : Tabanid flies collected in the northern part of Hokkaido 73

HAYAKAWA, H. : Catchabilities of tabanid species by a collapsible pyramid trap 75

SUZUKI, H., FUJITA, Y., OYAMA, N., SATO, T. and SUMIDA, H. : Susceptibility changes to panicle blast of rice plant affected with cool damage of sterile type or that of growth-delayed type 77

SUZUKI, H. and FUJITA, Y. : Influence of rain after inoculation on the lesion develoment of rice blast disease 79

FUJITA, Y. and SUZUKI, H. : Influence of temperature,, shading and artificial rain on sporulation of Pyricularia oryzae 81

ADACHI, T., MATSUMOTO, K. and HASHIMOTO, A. : Effect of low air temperature on the incidence of rice panicle blast 84

IWANO, M. and ASAGA, K. : Competitions among the isolates belonging to major and minor races of rice blast fungus distributed in a paddy field 86

SUZUKI, H. and FUJITA, Y. : Effect of fungicides to rice blast disease in paddy field irregated with cold water 88

FUKAYA, T. and KOBAYASHI, J. : Simple method for detecting resistant strains of Pyricularia oryzae Cavara to Kasugamycin 91

OSADA, S. : Studies on the drug-resistant strains of Pyricularia oryzae Cavara III . Effect of granular fungicides by submerged application on population change in resistant strains of rice blast fungus, Pyricularia oryzae Cav., to Kasugamycin and IBP 95

OSADA, S. : Studies on the drug-resistant strains of Pyricularia oryzae Cavara IV . Effect of rice cultivars differing in field resistance to blast on population change in resistant strains of rice blast fungus, Pyricularia oryzae Cav., to Kasugamycin and IBP 98

OSADA, S. : Studies on the drug-resistant strains of Pyricularia oryzae Cavara V . Effect of differing in lesion development to blast on population change in resistant strains of rice blast fungus, Pyricularia oryzae Cav., to Kasugamycin and IBP 101

SUWA, M., WATANABE, S., SUGAKAWA, K. and OGAWA, K. : Behavior of pathogens during normal temperature storage of colored rice grains 104

GOTO, T. : Effect of thiram seed protectant on bacterial seedling rot of rice by Pseudomonas glumae 107

OGAWA, K. and OZAWA, T. : Process and effect of double seed-disinfection by thiram benomyl wp. and bath treatment against wheat and barley 109

NEMOTO, M. : Occurrence of leaf rust on maize plants Tohoku district 111

MIKOSHIBA, Y., NEMOTO, M. and GOMI, T. : Maize streaked dwarf disease occurred in the field of Tohoku national agricultural experiment station 113

IIZUKA, N. and YUNOKI, T. : Evaluation of resistant soybean varieties to soybean mosaic and stunt viruses by sap or graft inoculation 115

FUJITA, Y. and SUZUKI, H. : Synchronization of soybean maturity by picking off flowers and its application for selection of resistant varieties to purple seed stain 118

TSUCHIYA, S. and FURUYA, H. : Physiologic race of Phytophthora magasperma f. sp. glycinea from soybean root and stem rot of occurred in Hachirogata reclaimed land, Akita prefecture 121

YANAGITA, K. and ISHIZAKA, N. : Control of phytophthora stem rot of soybean by metalaxyl 124

SEKIZAWA, H. and NAKATANI, F. : The first occurrence of rust on garland chrysanthemum in Japan 126

OSANAI, Y., NAKAZAWA, N. and FUKUSHIMA, C. : Effect of basamid on the violet and white root rot diseases of apple tree 128

CHU, E., NAKAZAWA, N. and FUKUSHIMA, C. : Studies on the silver-leaf disease of apple tree（1）. Observation of the inoculated apple trees with the mycelia of Stereum purpureum 130