THE DISTURBING EFFECT OF MICRYPHANTID SPIDERS ON THE LARVAL AGGREGATION OF THE TOBACCO CUTWORM, SPODOPTERA LITURA (LEPIDOPTERA : NOCTUIDAE)

スポンサーリンク

概要

• 論文の詳細を見る

• Some experiments and field observations were conducted in 1970 and 1971 in Ino, Kochi, to assess the effect of micryphantid spiders, mainly Oedothorax insecticeps, upon the larval colony of the tobacco cutworm, Spodoptera litura. In the taro field, the density of the micryphantid spider was high in the rainy season, i.e. June to early July, but it decreased rapidly in early July. The low density was maintained during the summer season, although the spider was very abundant in wet places overgrown with weeds. On the basis of the functional response of the spider, it was estimated that the maximum number of hatchlings which can be eaten by a spider was 96 individuals during the 1st instar. Survivorship curves of the spider-free larval colonies in cages of nylon gauze were compared with those of colonies exposed to the spider in the cages. Sixty and 18 per cent of mortality were observed by the next day of hatch in exposed and spider-free cages, respectively. Of 60 per cent mortality, only 4 per cent was accounted for by the actual predation which was assessed by the number of head capsules left on the taro leaf. Since 18 per cent of hatchlings were dead in spider-free cage, remainder, i.e. 60-18-4=38 per cent, was loss by larval dispersal out of the leaf induced by the spider's attack. Egg masses composed of various numbers (100-900) of eggs were placed on taro plants, and changes in number were followed during the 1st instar. In the period from late June to early July when micryphantid spiders were abundant, the survival rates of 1st instar larvae were 2-3% regardless of the number involved in the colony up to 900 individuals per colony. Taking consideration of the maximum number of prey could be eaten by a spider, i.e. 96 individuals, almost all of the hatchlings would be killed indirectly by the disturbing effect of spiders.

• 日本昆虫学会の論文
• 1973-06-25

著者

• Nakasuji Fusao

  Prefectural Institute Of Agricultural And Forest Science

• KIRITANI Keizi

  Prefectural Institute of Agricultural and Forest Science

• NAKASUJI FUSAO

  Division of Entomology, Prefectural Institute of Agricultural and Forest Science

• YAMANAKA HISAAKI

  Division of Entomology, Prefectural Institute of Agricultural and Forest Science

• KIRITANI KEIZI

  Division of Entomology, Prefectural Institute of Agricultural and Forest Science

• Kiritani Keizi

  Division Of Entomology National Institute Of Agro-environmental Sciences

• Yamanaka Hisaaki

  Prefectural Institute Of Agricultural And Forest Science:(present Address)aki Agricultural Extension

• Nakasuji Fusao

  Division Of Entomology Prefectural Institute Of Agricultural And Forest Science

関連論文

• Predation of Larvae of the Tobacco Cutworm Spodoptera litura (Lepidoptera, Noctuidae) by Polistes Wasps
• THE DISTURBING EFFECT OF MICRYPHANTID SPIDERS ON THE LARVAL AGGREGATION OF THE TOBACCO CUTWORM, SPODOPTERA LITURA (LEPIDOPTERA : NOCTUIDAE)
• DETERMINATION OF PREDATOR-PREY RELATIONSHIP WITH AN ACTIVABLE TRACER, EUROPIUM-151
• Studies on Ecology and Behavior of Japanese Black Swallowtail Butterflies(Lepidoptera : Papilionidae) : V. Fecundity in Summer Generations
• Studies on Ecology and Behavior of Japanese Black Swallowtail Butterflies. III. Diurnal Tracking Behavior of Adults in Summer Generation
• Survival and Egg-sac Formation Rates of Adult Females of Lycosa pseudoannulata(BOES. et. STR.) (Araneae : Lycosidae in the Paddy Field)
• INFLUENCE OF PARENTAL AGE UPON THE OFFSPRING IN THE GREEN RICE LEAFHOPPER, NEPHOTETTIX CINCTICEPS UHLER (HEMIPTERA : DELTOCEPHALIDAE), WITH SPECIAL REFERENCE TO ENVIRONMENTAL CONDITIONS
• Analysis of Injury Timing and Compensatory Reaction of Soybean to Feeding of the Southern Green Stink Bug and the Bean Bug
• Studies on Ecology and Behavior of Japanese Black Swallowtail Butterflies : IV. Estimation of Life Span of Male Papilio helenus nicconicolens BUTLER and P. protenor demetrius CRAMER (Lepidoptera : Papilionidae)
• Studies on Ecology and Behavior of Japanese Black Swallowtail Butterflies : I. Ecological Characteristics of Male Populations in Papilio helenus nicconicolens BUTLER and P.protenor demetrius CRAMER : Lepidoptera : Papilionidae
• Inter-generational Changes in Relative Abundance of Insects Infected with Rice Dwarf Virus in Populations of Nephotettix cincticeps UHLER(Hemiptera : Deltocephalidae)
• Evaluation of Mortality Factors with Special Reference to Parasitism of the Green Rice Leafhopper, Nephotettix cincticep UHLER (Hemiptera : Deltocephalidae)
• Simulations of the Population Changes of Lycosa in the Paddy Field(Lycosidae : Lycosa)
• Fine Structure of Trivial Movement in the Green Rice Leafhopper, Nephotettix cincticeps (UHLER) (Homoptera : Cicadellidae)
• Ill-Effects of Rice Dwarf Virus upon Its Vector, Nephotettix cincticeps UHLER (Hemiptera : Deltocephalidae), and Its Significance for Changes in Relative Abundance of Infected Individuals among Vector Populations
• The Selective Toxicity of Insecticides against Insect Pests of Rice and Their Natural Enemies
• A Systems Model for the Prediction of Rice Dwarf Virus Infection of Middle-season Rice
• Effects of Parental Age on the Life Cycle of the Southern Green Stink Bug, Nezara viridula L. (Heteroptera : Pentatomidae)
• Landing Places of Migratory Planthoppers, Nilaparvata lugens (STÅL) and Sogatella furcifera (HORVATH) (Homoptera : Delphacidae) in Japan

もっと見る 閉じる

スポンサーリンク