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Dive into the research topics where Kenji Koyama is active.

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Featured researches published by Kenji Koyama.


Applied Entomology and Zoology | 1975

Oviposition of Smaller Brown Planthopper, Laodelphax striatellus, into Various Carbohydrate Solutions Through a Parafilm Membrane (Hemiptera : Delphacidae)

Jun Mitsuhashi; Kenji Koyama

Thc selective oviposition of thc smallcr brown planthopper, Laodeiphax striateltus, into various carbohydrate selutions was examined in an attempt to cvaluate the eflectivcness of such art;ficial media in comparison to 5% sucrose, which has been used in recent years to collect planthopper eggs. Among the carbohydratcs examined, none demonstrated better efllects on ovipository success than sucrosc. Thcrefore, the suitabil;ty and reliability of sucrose solution as an artificial medium for ovipusition was asccrtained by the prcsent experi-


Japanese Journal of Applied Entomology and Zoology | 1991

Essential Vitamins for Nymphal Growth of White-Backed Planthopper Sogatella furcifera HORVATH(Hemiptera: Delphacidae).

Kenji Koyama

セジロウンカの幼虫発育に不可欠なビタミンを明らかにした。ふ化直後から幼虫をビタミン各1種類を除去した人工飼料で飼育したところ,チアミン塩酸塩および塩化コリンを欠いた場合,ふ化幼虫は成虫まで発育することができなかった。したがってこれら2種のビタミンは不可欠なビタミンと考えられた。飼料中のチアミン塩酸塩の最低有効濃度は0.005mg/100ml付近と推定され,塩化コリンの最低有効濃度は0.098mg/100ml付近と推定された。至適濃度の範囲は決定することができなかった。ピリドキシン塩酸塩およびパントテン酸カルシウムは不可欠なビタミンではないが成虫化率が非常に低かった。


Applied Entomology and Zoology | 1985

Nutritional Physiology of the Brown Rice Planthopper, Nilaparvata lugens STAL (Hemiptera : Delphacidae) : III. Essential Vitamins for Nymphal Development

Kenji Koyama


Japanese Journal of Applied Entomology and Zoology | 1972

Artificial Rearing of the Smaller Brown Planthopper, Laodelphax striatellus FALLEN, with Special Reference to Rearing Conditions for the First Instar Nymphs

Jun Mitsuhashi; Kenji Koyama


Japanese Journal of Applied Entomology and Zoology | 1973

Rearing of Inazuma dorsalis and Nephotettix cincticeps on a synthetic diet

Kenji Koyama


Applied Entomology and Zoology | 1969

Survival of Smaller Brown Planthopper, Laodelphax striatellus FALLEN, on Carbohydrate Solutions : Hemiptera : Delphacidae

Jun Mitsuhashi; Kenji Koyama


Japanese Journal of Applied Entomology and Zoology | 1986

Rearing of the predacious mite, Amblyseius eharai Amitai et Swirski (Acarina:Phytoseiidae) on a synthetic diet.

Norio Itagaki; Kenji Koyama


Japanese Journal of Applied Entomology and Zoology | 1979

Rearing of the brown planthopper, Nilaparvata lugens Stal (Hemiptera: Delphacidae) on a synthetic diet

Kenji Koyama


Japanese Journal of Applied Entomology and Zoology | 1977

Essential Vitamins for the Nymphal Growth of the Smaller Brown Planthopper, Laodelphax striatellus

Kenji Koyama; Jun Mitsuhashi


Japanese Journal of Applied Entomology and Zoology | 1969

Artificial Feeding of Smaller Brown Planthopper, Laodelphax striatellus FALLÉN (Hemiptera: Delphacidae)

Kenji Koyama; Jun Mitsuhashi

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Jun Mitsuhashi

Tokyo University of Agriculture and Technology

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