No.39 (1988)

HARADA, Y. : Studies on the life cycle of rusts, with emphasis on heteroecism and specialization of parasitism 1

OKUYAMA, S., KAZINO, Y. and SATO, K. : Outbreak of the oriental armyworm in Hokkaido, 1987 1. Outbreak of the first generation and the causative factors 9

OKUYAMA, S., KAZINO, Y., SATO, K., AKIYAMA, Y. and HASHIMOTO. Y, : Outbreak of oriental armyworm in Hokkaido 1987 2. Occurrence of the second generation and the causative factors 13

KITAMURA, C. and SAITO, O. : Outbreak of the armyworm, Pseudaletia separata Walker at Hokkaido in 1987 1. Meteorological analysis of the migration 18

SAITO, O. and KITAMURA, C. : Outbreaks of the armyworm, Pseudaletia separata Walker at Hokkaido in 1987 2. Occurrence of the first generation and percentage of mating 20

FUJIMURA, T., ARAYA, E., ICHITA, T. and KIMURA, T. : Ecological aspects of the armyworm, Pseudaletia separata Walker, immigrated into Aomori in 1987 1. Seasonal trap catches of adults, with reference to ovarian developement and proportion of mated females 23

KIMURA, T. and FUJIMURA, T. : Effect of dusts applying to rice, on larvae of the armyworm, Pseudaletia separata Walker 29

NAKAMINAMI, H., CHIBA, T., ITO, M., FUJIOKA, S. and CHIBA, T. : Occurrence of the oriental armyworm, Pseudaletia separata Walker, in Iwate prefecure, 1987 32

KIMURA, S. and KODAMA, K. : Sersonal abundance of the Pseudaletia separata Walker in northern district of Akita prefecture in 1987, and the damage in rice plant 35

SATO, Y. : a case of severe decrease in yield of rice injured by srmyworm, Pseudaletia separata Walker, in Akita prefecture 41

FUSE, H. and SAITO, T. : Outbreak of the oriental armyworm, Pseudaletia separate Walker, in the Shonai province, Yamagata prefecture, 1987 1. Factors causing the outbreak 44

SAITO, T. and FUSE, H. : Outbreak of the oriental armyworm, Pseudaletia separate Walker, in the Shonai province, Yamagata prefecture, 1987 2. Effect of injury on rice plants 49

HIRAI, K. : Possible source and route of migration of the armyworm, Pseudaletia separate Walker, invaded to Tohoku district in June of 1987 52

NAKAJIMA, T. and HORINO, O. : Blast isolates possessing virulence to indica cultivars of rice with unidentified resistance genes 59

ISHIGURO, K., YOSHITAKE, S., WATANABE, S., NEMOTO, F. and HASHIMOTO, A. : Temporal dynamics of fthalide on rice leaves in the field and its efficacy for preventing leaf blast 63

FUJITA, Y. and YAEGASHI, H. : Effects of low temperature and cold water on panicle blast of rice (Pyricularia oryzae) 66

HONKURA, R., OIKAWA, T. and INOUE, T. : Occurrence of blast disease of job's tears, Coixlachryma-jobi var. frumentacer Makino by Pyricularia oryzae Cavara 68

TAKEDA, S. and OGAWA, K. : Effect of development of rice sheath blight occurrence on the yield and quality of rice 71

OHTA, K., IMAI, T., SHIMADA, K. and CHIBA, J. : A computer simulation model for rice sheath blight disease 1. Synthesis of disease model 74

SUZUKI, H. : Effect of application time of fungicide on the seasonal occurrence of rice sheath blight 80

MIURA, M., HONKURA, R., MIURA, Y. and OSADA. Y. : Several sclerotial fungi isolated from sheath blight-like lesions and their distribution in Miyagi prefecture 84

HONKURA, R. and MIURA, Y. : Some notes on the spore disperse and the period of infection of rice false smut pathogenic fungus 88

SONODA, R., FUJITA, Y. and YAEGASHI, H. : Distribution of the false smut balls produced on rice panicle 92

MIURA, Y., TSUJI, H. and ISHIGAKI, M. : On the outbreak of the kernel smut (Tilletia horrida Takahashi) of rice plants in Miyagi prefecture 94

SONODA, R., FUJITA, Y., HONKURA, Y. and YAEGASHI, H. : Pathogenic fungi isolated from Eleocharis kuroguwai and Scirpus spp. 98

MATSUDA, I. and SUGIYAMA, S. : Occurrence of take-all of wheat in Aomori prefecture 100

SAWASAKI, A. and SATOH, H. : Occurrence and chemical control of eyespot of wheat in Hokkaido 102

SHINODA, N. : Timing and efficacy of application of benomyl for control of wheat eyespot 105

NAKAJIMA, T., GOMI, T. and NEMOTO, M. : Formation and isolation method of microsclerotia of Calonectria crotalariae by using cellophane layers 108

HONKURA, R., SHIRAKO, Y., TSUJI, H., MIURA, Y. and ISHIGAKI, M. : Prevalence of soybean dwarf disease in Miyagi prefecture 110

OZAKI, M., AKAI, J., ENDO, T. and TAKAKUWA, M. : Control of late blight and of tuber rot of potatoes, caused by Phytophthora infestans, by mancozed metalaxyl WP. 112

KIKUCHI, S., TANAKA, T. and SUZUKI, M. : An unusual occurrence of brown rot of watermelon, caused by Phytophthora capsici Leonian 118

NAKATANI, F. and HIRARAGI, T. : Occurrence of letture diseases in the open field 121

ARAI, S., FUKUSHIMA, T. and TANAKA, Y. : On establishment of inoculation method of violet root rot pathogen, Helicobasidium mompa Tanaka, to apple trees 125

OGATA, T. and MITSUEDA, T. : Distribution of the white root rot pathogen, Rosellinia necatrix Berl., in apple orchard soils 128

MATSUZAKI, I., HANEDA, H. and MITSUEDA, T. : Temporal change of inoculum potential of white root rot pathogen, Rosellinia necatrix Berl., in soil 131

SATO, T. and SUZUKI, T. : Adult size variation in the rice leaf beetle, Oulema oryzae, emerged on various host plants 133

SATO, M., TOGASHI, H., TANIGUCHI, E. and ISHIGAKI, H. : Migration of long-range migratory insects to Shonai district 135

HACHIYA, K., KAZINO, Y. and AKIYAMA, Y. : Occurrence of dryinid-wasp (Hymenoptera) and its annual prevalence of parasitism rate to the small brown planthopper, Laodelphax striatellus Fallen(Homoptera:Delphacidae) 140

HACHIYA, K. : Occurrence of Elenchinus japonicus Esaki et Hashimoto (Strepsiptera:Elenchidae) and its parasitism rate to the small brown planthopper, Laodelphax striatellus Fallen (Homoptera : Delphacidae) 143

HACHIYA, K. : Physiological and ecological difference between drvinid-wasps Haplogonatopus atratus Esaki et Hashimoto collected in Hokkaido and Ibaragi prefecture 146

IITOMI, A., NAKAMURA, N. and MATUHASHI, M. : Comparison of beating methods in relation to sampling efficiency of sticky of sticky-boad method in population estimation of rice planthoppers 149

TAKANO, T. : Outbreaks and their locality of the green rice leafhopper, Nephotettix cincticeps Uhler, in Miyagi prefecture 153

NAGATA, T. and TAKEDA, M. : A technique to measure feeding rates of the green rice leafhopper, Nephotettix cinciceps Uhler, with small amount of samples 157

TANAKA, H., CHIBA, T., FUJIOKA, S., CHIBA, T., ITO, M. and NAKAMINAMI, H. : Occurrence of the rice bugs and spotted rice in Iwate prefecture 162

NAGANO, T., FUJISAKI, Y. and MIYATA, M. : Seasonal prevalence of the sorghum plant bug, Stenotus rubrovittatus Matsumura, in Miyagi prefecture 167

HASHIMOTO, Y. and HARUKI, T. : On the timing if control of the rice leaf bug, Trigonotylus colestialium Kirkaldy 170

ARAYA, E., OYAMA, N. and SUTO, K. : Notes on the outbreak of the rice leafroller, Cnaphalocrocis medenalis Guenee, in Aomori prefecture, 1987 1. Immigration of adults 173

ARAYA, E., OYAMA, N, SUTO, K., MATSUDA, M, and IWAMA, Y. : Notes on the outbreak of rice leafroller, Cnaphalocrocis medenalis Guenee, in Aomori prefecture, 1987 2. Field research on the outbreak 177

KODAMA, K. and KIMURA, S. : Notes on the concentrated damages by the rice leafroller, Cnaphalocrois medinalis, in the northern coastal area of Akita prefecture 179

KATOH, T., SAITOH, T., WATANABE, K. and YOKOYAMA, K. : Ecology of the rice grasshopper, Oxya yezoensis Shiraki, in Yamagata prefecture 182

HAYAKAWA, H., GOTO, C., TSUTSUI, H., ISHIDA, S. and IBUKI, T. : Control of the cabbage armyworm, Mamestra brassicae Linne, on uppland crops by ultra low volume application of insecticides 185

SHIMIZU, K., AIBA, S. and MITSUI, Y. : Effects of the some crops on the population density of the soybean cyst nematode, Heterodera glycines Ichinohe 187

TAKANO, T. : Seasonal prevalence of the soybean pod gall midge, Asphondylia sp., in the southern Tohoku district 189

KEGASAWA, K. : Rases of the soybean cyst nematode in Aomori, Iwate, and Fukushima 192

MIZUKOSHI, T., HANADA, T. and HASHIMOTO, Y. : Effect of photoperiod conditions on appearance of the oviparous famale of the foxglove aphid, Acyrthosiphon solani Kaltenbach I. Critical photoperiod for oviparous females and their time of appearance in the field 194

MIZUKOSHI, T. : Effect of photoperiod conditions on appearance of the oviparous famale of the foxglove aphid, Acyrthosiphon solani Kaltenbach II. Effect of rearing the last two generations under a short photoperiod 197

TSUTSUI, H., HAYAKAWA, H., GOTO, C., ISHIDA, S. and IBUKI, T. : Control of the foxglove aphid, Aulacorthum solani Kaltenbach, on potato plants by ultra low volume application of insecticides 199

TSUTSUI, H., HAYAKAWA, H., GOTO, C. and HANADA, T. : Occureence of Gastrophysa atrocyanea Motschulsky in the Tokachi district of Hokkaido 203

TORIKURA, H. : On the stalk-borers of young corn in northern Hokkaido IV. Estimation of larval instar by its head width 206

TORIKURA, H. : On the stalk-borers of young corn in northern Hokkaido V. Spatial distribution and seasonal fluctuation of damaged corn with reference to larval age-strucure 209

TORIKURA, H. : On the stalk-borers of young corn in northern Hokkaido VI. Larval ability to increase corn damage 213

HAYAKAWA, H. and TSUTSUI, H. : A case of outbreak of the cabbage armyworm Mamestra brassicae Linne on sugar beet in the Tokachi district of Hokkaido 215

SAITO, O. : Notes on larval hidernation of the alfalfa looper, Autographa gamma (Linnaeus) on cabbage plant in Sapporo, Hokkaido 217

KANEHIRA, O. and TORIKURA, H. : Overwinter of the larvae of Autographa gamma Linnaeus 218

MIYATA, M. and NISHIZAWA, T. : Fauna of plant-parasitic nematodes associated with vegetables in Miyagi prefecture 221

SATO, M. : Control of cobb root-lesion nematode, Pratylenchus penetrans Cobb, on Cirsium dipsacolepis Matsumura by oxamyl 224

HAYAKAWA, H., TSUTSUI, H. and GOTO, C. : A survey of overwintering of the diamond-back moth, Plutella xylostella Linne, in the Tokachi district of Hokkaido 227

KIMURA, T. and FUJIMURA, T. : Overwintering of the diamodback moth, Plutella xylostella Linne, in Aomori prefecture 4. Longevity of eggs, larvae, pupae and adults under the snow 229

IINUMA, A. and SAITO, O. : Additional notes on damages of onion by the onion stem borer, Hydraecia mongoliensis Urbahn, and their control 232

MAEDA, M., MASUDA, T., and TAKANO, T. : Severe occurrence of the greenhouse whitefly, Trialeurodes vaporariorum (Westwood) on strawberry 235

NISHIJIMA, Y. and SAITO, O. : The occurrence of asparagus leaf beetle, Crioceris quatuordecimpunctata (Scopoli). in Hokkaido 237

TSUTSUI, H., HONMA, K. and HAYAKAWA, H. : Cold-hardiness in adults of the overwintering cabbage bug, Eurydema rugosa Motschulsky 239

NARITA, T. : Control of the apple tortrix, Archips fuscocupreanus Walsingham on apple trees by chitin synthesis inhibitors 242

KAWASHIMA, K. : Effects of chitin synthesis inhibitors on the four-spotted chrysopa, Chrysopa septempunctata Wesmael 246

AMANO, K., HASEGAWA, T. and TSUBAKI, Y. : Laboratory tests to determine susceptibility of Musca conducens Walker adults to permethrin 248

SASAKI, H., NISHIJIMA, Y. and HAYAKAWA, H. : Note on the tabanid flies collected in the wooded region of Tohbetsu, Hokkaido (Diptera : Tabanidae) 250