No. 35（1984）

KOSHIMIZU, Y. : Reminiscences of 25 years of research work on rice blast 1

FUJITA, Y. and SUZUKI, H. : Seasonal occurrence of rice blast in the paddy field transplanted with diseased-seedlings 8

SUZUKI, H. and FUJITA, Y. : Changes in leaf susceptibility to blast disease of rice plants treated with low temperature at different ages of leaf 10

ADACHI, T., MATSUMOTO, K. and HASHIMOTO, A. : Effects of low temperature after inoculation at the first heading time on the incidence of rice panicle blast 13

OHTA, K., SHIMADA, K. SATO, N. and WASHIO, S. : Statistical analysis of climatic effects on the degree of fungus development of rice blast estimated by the leaf sheath inoculation technique 15

SUZUKI, H. and FUJITA, Y. : Time and number of application of granules or wettable powders for control of the rice blast disease occurred under cold water irrigation 18

SUZUKI, H. and FUJITA, Y. : Relationship between the occurrence of leaf and panicle blast disease in the paddy field irrigated with cold water 21

IWANO, M. and ASAGA, K. : A comparison of the aggressiveness among the isolates of rice blast fungus virulent to a rice variety Toride No. 1(Pi-zt) 24

IWANO, M. and ASAGA, K. : Races of rice blast fungus isolated from a paddy field in southern district of Akita prefecture in 1983 27

IWANO, M., ASAGA, K., INOUE, T. and HONKURA, R. : Racial distribution of rice blast fungus in the regions in Miyagi prefecture where were mainly cultivated a cultivar with one true resistant gene(Pi-a)to blast 29

TSUKIJI, K. and OZAWA, T. : Drift of fungicides on aerial application for the control of rice blast 32

MASUMOTO, K., HASHIMOTO, A. and ADACHI, T. : On the resistant strains of Gibberella fujikuroi (Sawada) S.Ito to benomyl appeared in Fukushima Prefecture (preliminary note) 34

TANAKA, F. and TSUCHIYA, S. : Studies on pink coloring of rice grains I . Infection period of Epicoccum purpurascens to the glumes and effect of low temperature on its infection 37

HONKURA, R., INOUE, T. and OIKAWA, T. : False blast of rice leaf blade caused by Helmithosporium (Exserohilum) sp. 40

HARADA, Y. : Inoculation experiments with corn rust, Puccinia sorghi Schw., on its alternate hosts, Oxalis spp. 41

TAKAHASHI, T. : A method for evaluating the effectiveness of seed disinfectant against purple seed stain of soybean 43

TOHKAIRIN, H., TAKEDA, T., ARAGAKI, K. and MIURA, H. : Occurrence and some investigations of root necrosis by Calonectria crotalariae (Loos) Bell et Sobers, of soybean in Yamagata prefecture 46

OGAWA, K., SUZUKI, T. and TAKEDA, S. : Occurrance of soybean dwarf in Iwate prefecture, and its control effect 50

TAKEDA, T., ONIKI, M. and SUZUI, T. : Effect of fungicides for the hyphal growth of 3 Cylindrocladium species 53

SUGIYAMA, S., NORO, S. and MATSUNAKA, K. : Occurrence of zonate leaf spot in tomatoes in Aomori prefecture in 1983 56

FUJITA, K., MATSUNAKA, K. and SEGAWA, K. : Effect of fungicidal sprays during bloom on apple fruit set and occurrence of russet 59

NAKAZAWA, N., SAITO, A. and FUKUSHIMA, C. : Control of apple scab (1) Some fungicides with curative effect on the disease 62

HAYASHI, S. and OCHIAI, M. : Studies on the ring rot of apples 2 . Spore dissemination of Botryosphaeria sp. from diseased twigs 65

CHU, E., NAKAZAWA, N. and FUKUSHIMA, C. : Studies on the silver-leaf disease of apple trees(2) Further observation of the symptoms of apple trees inoculated with mycelia of Stereum purpureum 68

TSURUTA, R. : Insecticides available for control of 2nd generation of rice stem borer, Chilo suppressalis Walker, after prediction of rice yield loss due to the insect 70

TAKANO, T., FUJISAKI, Y., ABE, K. and SATHO, S. : Outbreak of the white-backed planthopper,Sogatella furcifera Horvath, and the paddy leafroller, Cnaphalocrocis medinalis Guenee, in Miyagi prefecture in 1983 72

IITOMI, A., DOBASHI, S. and SATHO, Y. : Seasonal prevalence of the white-backed planthopper, Sogatella furcifera Hovath, in Akita prefecture 75

MURAI, T., FUJITA, M., ABE, N., ARAYA, E., KIMURA, T. and FUJIMURA, T. : The life cycle of small brown planthopper, Laodelphax striatellus Fallen, in Aomori prefecture 79

KONNO, T., TOHKAIRIN, H. and SAITO, T. : Behavior of dimethoate granules in rice plant, soil and irrigation water, and its effect on the rice stem maggot, Chlorops oryzae Matsumura 82

ARAI, S., SATO, T., ABE, N., MURAI, T., FUJITA, K. and FUJIMURA, T. : Ecology and control of rice water weevil, Lissorphoptrus oryzophilus Kuschel I . Immigration and dispersal in Aomori prefecture 85

SATO, S., ABE, K., FUJISAKI, Y. and TAKANO, T. : Seasonal prevalence of rice water weevil, Lissorhoptrus oryzophilus Kuschel, in Miyagi prefecture 89

SAITO, T., SHOJI, T. and ENDO, S. : Annual life cicle of the rice water weevil, Lissorhoptrus oryzophilus Kuschel, in Yamagata prefecture 91

KANEKO, K., ISHIGURO, K., TANIGUCHI, E., TOGASHI, Y. and FUSE, H. : Invasion of the rice water weevil, Lissorhoptrus oryzophilus Kuschel, in Shonai district in Yamagata prefecture 94

SHOJI, T., EGUCHI, H., SAITO, T. and ENDO, S. : Survival rate of overwitering adults of the rice water weevil, Lissorhoptrus oryzophilus Kuschel, in the long snow cover area 97

SUZUKI, T. and KOBAYASHI, M. : Ovipositing prevalence and seasonal prevalence of larva, pupa, in the rice water weevil, Lissorhoptrus oryzophilus Kuschel 100

KOBAYASHI, M. and SUZUKI, T. : Effects of an insecticide on rice water weevil (Lissorhoptrus oryzophilus Kuschel) in rice seedling boxs and application time for the granular agent 103

SATO, M. and FUSE, H. : Damage of soybean by the two-striped leaf beetle, Medythia nigrobilimeata Motschulsky, and its control by insecticides (II ) 106

SATO, M. and TSURUTA, R. : The fauna of soybean pests in Akita prefecture 110

TORIKURA, H. : Invasion, distribution and displacement of Aulacorthum solani Kaltenbach in sprouting potato field 115

AKIYAMA, Y. and TORIKURA, H. : Notes on the injury of upland crops by a broad-nosed weevil, Meotiorhynchus querendus Sharp 122

OKU, T. : Seasonal adult occurrence of the spotted cutworm and possibility of its settling in the lower subalpine zone 126

OHSAWA, S., TOYAMA, Y. and SAITO, M. : Insecticides susceptibility of the diamond-back moth in Fukushima prefecture 129

AMANO, K. : Host preference of the yellow striped flea beetle, Phyllotreta striolate Fab. (Coleoptera; Chrysomelidae) 132

SAITO, O. : Life history of the onion stem borer, Hydraecia mongoliensis Urbahn in Hokkaido 136

KAWASHIMA, K. and YAMADA, M. : An ovicide screening method for the peach fruit moth (Carposina niponensis Walsingham) using eggs laid on praffin paper 138

AIZU, H., SEKITA, N. and YAMADA, M. : Notes on apple fruit damage caused by sucking of the large brown cicada, Graptopsaltria nigrofuscata Motschulsky 140

HIRAI, K. : Number of moths caught in traps equipped with four fluorescent lamps, whith some characteristics of attracted moths 144

TORIKURA, H. : Biological notes on a crambine moth, Chrysoteuchia culmella Linnaeus injurious to grasses 147

OKU, T. and OHIRA, Y. : Aestivation site of Spaelotis valida Walker 152

HIRAI, K. : Notes on Apanteles kariyai Watanabe (Hymenoptera: Braconidae), a parasitoid of the armyworm, Pseudaletia separata Walker 154

KAWAHARA, A. and SAKAMOTO, Y. : Studies on the host preference of lesser clover-leaf weevil, Hypera nigrirostris (Preliminary report) 157

HAYAKAWA, H. : Variability of abdominal markings and autogeny in Chrysops vanderwulpi 160

HAYAKAWA, H., TAKAHASHI, H. and KIKUCHI, T. : Influence of the attack of tabanid flies on the daily behavior-pattern of grazing cattle 162

HAYAKAWA, H., INAOKA, T., YAMAGUCHI, K. and NAGASHIMA, G. : Tabanid flies collected in the southern part of the Oshima peninsula, Hokkaido 165

AMANO, K. : Researches of seasonal and diurnal prevalence of tabanid flies by means of CO2-lured net trap 168

AMANO, K. : Influence of some meteorological factors on seasonal and diurnal prevalence of adult black flies (Diptera : Simuliidae) 172

TAKAKURA, S. : Spread and increase in population of the plant parasitic nematodes in some field converted from paddy fields 176

TAKAKURA, S. : Difference of host reaction of some clover varieties to northern root-knot nematode 180

HORIGUCHI, H. and MURAI, T. : Droplet size distribution and spray drift potential in the ground low volume application of pesticides 182