Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Kenji Koyama.
Applied Entomology and Zoology | 1975
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
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
Kenji Koyama
Japanese Journal of Applied Entomology and Zoology | 1972
Jun Mitsuhashi; Kenji Koyama
Japanese Journal of Applied Entomology and Zoology | 1973
Kenji Koyama
Applied Entomology and Zoology | 1969
Jun Mitsuhashi; Kenji Koyama
Japanese Journal of Applied Entomology and Zoology | 1986
Norio Itagaki; Kenji Koyama
Japanese Journal of Applied Entomology and Zoology | 1979
Kenji Koyama
Japanese Journal of Applied Entomology and Zoology | 1977
Kenji Koyama; Jun Mitsuhashi
Japanese Journal of Applied Entomology and Zoology | 1969
Kenji Koyama; Jun Mitsuhashi