No.43 (1992)

TAKAHASHI, T. :Viroid diseases in plants 1

KOIZUMI, S., TAKEDA, S., SAKUMA, H. and NEMOTO, F. : Pathogenic races of rice blast fungus isolated in Akita, Yamagata and Fukushima Prefectures in 1991 7

TAKADA, S. : Seasonal occurrence of rice leaf blast at its early stage in small area of Iwate Prefecture in 1991 9

SOTODATE, K., HIRANO, M., URAKAWA, H. and SUZUKI, S. : Occurrence of rice blast disease in Iwate Prefecture, 1991 1. Some characters and factors 13

TSUKIJI, K., URAKAWA, F. and HIRANO, Y. : Occurrence of rice blast disease in Iwate Prefecture, 1991 2. Some cases of the disease control 15

TAKAHASHI, F. and TAKANO, T. : Factors of outbreak of rice blast disease for the last decade in Miyagi Prefecture 17

FUKAYA, T. and AWASAKI, H. : Occurrence of rice blast disease by Pyricularia oryzae Cavara in direct sowing culture of paddy rice on drained field in Hachirogata reclained field 19

FUKAYA, T. : Simple method for detecting resistant strains of Pyricularia oryzae Cavara to IBP 21

SAKUMA, H. TANAKA, T., YOKOYAMA, K., ENDO, S., SAITO, T. and FUJITA, Y. : Occurrence aspect of rice blast disease and the influence to the hulled rice yield and quality in Yamagata Prefecture, 1991 24

NEMOTO, F., HASHIMOTO, A. and HANZAWA, S. : Control of rice leaf blast forecasted by computer simulation model (BLASTL) 27

OHTA, K. and SHIMADA, K. : A Computer simulation model for rice sheath blight disease 5. A Forecast for yield losses by disease 30

KATOH, T., TANAKA, T. and FUJITA, Y. : Control of bacterial seedling blight and "Bakanae" disease with the treatment of several pesticides 1. Effect for bacterial seedling blight 34

TAKEUCHI, T. and MUNEKATA, M. : Occurrence of bacterial halo blight of rice in Hokkaido, Japan 37

OHTO, Y. and FUJISAWA, I. : Host range of Polymyxa graminis Ledingham, a vector of wheat yellow mosaic virus, in plants of Graminales 40

TAKEUCHI, T. and KODAMA, F. : Bacterial stalk rot of corn caused by Erwinia chrysanthemi pv. zeae (Sabet) Victoria, Arboleda et Munoz occurred in Hokkaido, Japan 42

TAKAKUWA, M. : Protection of potato late blight under the condition of occurrence of phenylamide resistant race 45

NAKAMINAMI, H., TAKAHASHI, H., NISHI, K., AKASAKA, Y. and TAKADA, S. : Influence of cultivation methods on occurrence of systemically infected seedlings of soybean downy mildew, Peronospora manshurica (Naumoy) Sydow ex Gaumann 48

OKUBO, T. and HASHIMOTO, Y. : The role of alate aphid on spreading SDV in soybean field 50

OKUBO, T. and HANADA, T. : On a vast occurrence of soybean dwarf disease A case study of Tokachi District in 1991 54

MIZUKOSHI, T. and HAGITA, T. : Differences in detection of soybean dwarf virus by enzyme-linked immunosorbent assary (ELISA) in different parts of the ladino clover 56

MIZUKOSHI, T. : Infection rates of two strains of soybean dwarf virus of ladino clover collected in the pastures of the Tokachi District of Hokkaido 59

HONKURA, R., NAKAMURA, S. and MIYATA, M. : The influence of transplanting time for the occurrence of soybean dwarf disease at the middle area in Miyagi Prefecture 61

MIZUKOSHI, T., HASHIMOTO, Y. and HANADA, T. : Inhibitive effect of silver polyethylene film on soybean dwarf virus infection and economical treatment in kidney beans 63

YAMASHITA, K. and OIKAWA, K. : Detection of garlic mosaic virus by DIBA and indirect ELISA 66

NAKATANI, F., AKASAKA, Y. and ANDO, Y. : Occurrence of radish leaf spot caused by Pseudocercosporella capsellae (Ell.et Ev) Deighton 69

KAJI, K., SONODA, T. and TAKEUCHI, M. : Occurrence of fruits rot of cucumber, caused by Phythopthora melonis Katsura in the market I. Damage and factors of the occurrence 72

KAJI, K., SONODA, T. and TAKEUCHI, M. : Occurrence of fruits rot of cucumber, caused by Phytophthora melonis katsura in the market II.The pathogenic fungus and control 74

SONODA, T. and KAJI, K. : Pathogenic strains of Verticillium dahliae, causal agent of Verticillium wilt of strawberry, and pathogenicity of Verticillium dahliae strains 77

FUKAYA, M. and KATO, S. : Occurrence of bitter rot of pear caused by Colletotrichum gloeosporioides Penzing in Akita Prefecture 80

YUKITA, K. : Infection of Valsa canker to apple trees through fruit-stems left behind on bourse at harvest 82

OGATA, T. and OCHIAI, M. : Studies on the forecasting of apple ring rot, Botryosphaeria berengeriana de Notaris f. sp. piricola (Nose) Koganezawa et Sakuma 2. The relation between the fruit infection and rainy day's weather condition, and amount of dispersed pycnospore 85

ISHIGURO, K. : Analysis of damage to rice by Oxya yezoensis Shiraki I. Effect on yield of feeding during the period from heading to maturity 87

ICHIMORI, T. and URAKAWA, F. : Biological studied on green rice leafhopper, Nephotettix cincticeps Uhler, in Iwate Prefecture 1. Prevalence in the southern part of Iwate Prefecture 90

MIYATA, M. : Effect of hull cracked rice on pecky rice caused by sorghum plant bug, Stenotus rubrovittatus Matsumura 2. Study of releasing period and density 93

NAGANO, T. and MIYATA, M. : Catch of rice skipper Parnara guttata (Bremer et Grey) by colored sticky traps 96

ITO, H., OHSAWA, S. and SATO, R. : Estimation of maximum immigration period of the rice water weevil, Lissorhoptrus oryzophilus Kushel, using mesh climatic chart programs of Fukushima Prefecture II. Adaptability of estimated immigration period based on day-degree accumulation 98

KIDOKORO, T. : Factors affecting the inhabiting ratio in water of the hibernated adult of rice water weevil, Lissorhoptrus oryzophilus Kuschel 100

KOHNO, K. : Year-to-year fluctuation of wireworms in maize field 104

KOHNO, K. : Comparison of catches of the click beetle, Melanotus legatus Candeze, by several types of traps 106

KOHNO, K. : Effect of granular insecticide application on wireworms infesting maize 108

SHIBUYA, S. : Simultaneous control of the soybean podborer, Leguminivora glycinivorella matsumura, soybean pod gall midge, Asphondylia sp. and several kinds of stink bug by fenvalerate MEP 110

KIDOKORO, T. and MAEDA, M. : Seasonal changes of economic injury level of the bean tussock moth, Cifuna locuples confusa (Bremer) 112

TAKANO, T. : Outbreak of the soybean pod gall midge, Asphondylia sp., in 1988 117

SAITO, O. : Seasonal prevalence of the seedcorn fly surveyed by the kairomone trap in Tokachi, Hokkaido 119

SAITO, O. : Control of seedcorn maggot in soybeans by application of diflubenzuron bait on soil surface after sowing 121

KEGASAWA, K. : Study of an egg-parasitic fungus (Paecilomyces sp.) to the soybean cyst nematode (Heterodera glycines Ichinohe) (1) Activity of the egg-parasitic fungus on various soil conditions 124

KEGASAWA, K. and SAKAI, S. : Study of the egg-parasitic fungus (Paecilomyces sp.) to the soybean cyst nematode (Heterodera glycines Ichinohe) (2) Movements of soybean cyst nematode and egg-parasitic fungus in soybean filed 127

SATO, R., OHSAWA, S. and SATO, T. : Seasonal prevalences of spider mites in the kidney bean fields 129

KIKUCHI, O. : Pesticide susceptibility of aphids on broad bean 131

MATSUZAKI, I. and ITAKURA, J. : Effect of collembola grazing on the reduction of Rhizoctonia damping-off of vegetable seedlings in three types of soils under the Laboratory conditions 133

KODAMA, K., SATO, K., OMI, Y., SHIBUYA, K. and NARITA, H. : Seasonal prevalence of flower thrips, Frankliniella intonsa (Trykom) in the southern area of Akita Prefecture 135

OKAZAKI, K. and SATO, R. : Control of the diamondback moth, Plutella xylostella by communication disruption 139

NAKAMINAMI, M. and AKASAKA, Y. : Population fluctuations of Pratylenchus spp. caused by cultivation of several crops 2. Population fluctuations of Pratylenchus penetrans 141

ABE, N., SASAKI, M. and YOSHII, T. : Control effect of mating disruption with synthetic pheromones on the apple leafminer, Phyllonorycter ringoniella Matsumura 144

WATANABE, K. : Estimation of total effective temperature on ground surface by using "triangle method" 146

FUNAYAMA, K., and TAKAHASHI, Y. : Seasonal prevalence of occurrence and optimum timing for control of apple rust mite Aculus schlechtendali (Nalepa) 149

FUJIBAYASHI, Y. and KUSHITA, T. : Susceptibility of Panonychus ulmi (Koch) and Tetranychus urticae Koch to acaricides in the Tsugaru region, Aomori Prefecture 152

SATO, T., SATO, R. and YAMADERA, M. : Occurrence of the gall wasp, Diplolepis japonica (Walker) on the endemic rose, Rosa multiflora Thunb., cultivated for ornamental use 155

CHIBA, T. : Biological notes on Amphipoea ussuriensis (Petersen) 157

KANEKO, J., ENDOU, T. and SUGAWARA, N. : Seasonal prevalence at grass field and individuals number come flying to marigold flowers of silver Y moth, Autographa gamma (L.) (Noctuidae : Plusiinae) in comparison with that of Asiatic common looper, A. nigrisigna (Walker) 161

OKU, T. : Under-ground population trends of scarabaeid beetles in natural grasslands 166

HAYAKAWA, H. and YAMASHITA, N. : Relationship between age of cattle dung and visiting dung beetles surveyed at a pasture in the suburbs of Morioka City 170

YAMASHITA, N. and HAYAKAWA, H. : Studies on mess rearing methods of the dung beetle, Onthophagus gazella 8. Separation methods of attached soil from residual cattle dung for measuring amounts of dung consumed 173

AMANO, K. : Juvenile hormone activity of pyriproxyfen on the yellow dung fly, Scatophaga stercoraria 175

HAYAKAWA, H. and INAOKA, T. : A survey of tabanid flies at Tomamae and Horokanai areas in the northern part of Hokkaido 177

HAYAKAWA, H., SASAKI, H. and NISHIJIMA, H. : A survey of tabanid flies along the upper basin of the Nishibetsu River in the eastern part of Hokkaido 179

TORIKURA, H. : On the estimation for the flight distance of Mimela testaceipes Motschulsky (Coleoptera, Scarabaeidae) 181

TORIKURA, H. : What kind of chafers are attracted to light ? 185

SAITO, O. and GOTO, C. : Control of the cabbage armyworm and the spotted cutworm by two baculovirus in sugar beet field 189

MASUDA, T. and KIKUCHI, O. : Pathogenicity of some entomopathogenic fungi to the silkworm, Bombyx mori 191

MASUDA, T. and KIKUCHI, O. : On the species of longicorn beetle infected with entomopathogenic fungus, Beauveria brongniartii, in the field 194