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Watanabe, Hiroshi; Katayama, Noboru; Yano, Eizi; Sugiyama, Ryohei; Nishikawa, Shoko; Endou, Takuya; Watanabe, Kaori; Takabayashi, Junji; Ozawa, Rika
Biological control, 11/2014, Letnik: 78Journal Article
Display omitted •Aphidoletes aphidimyza adults feed on aphid honeydew.•We analyzed the sugar compositions of aphid honeydews.•Sucrose caused the greatest increase in the longevity of A. aphidimyza.•Additional sucrose increased the fecundity of A. aphidimyza even when aphid honeydew was available. The predatory gall midge Aphidoletes aphidimyza, which is used for augmentative biological control of aphids in greenhouses, uses aphid honeydew as an energy source. Currently, Rhopalosiphum padi on barley plants and Melanaphis sacchari on sorghum plants are used as the banker plant systems for A. aphidimyza to control Aphis gossypii on eggplant in Japan. We analyzed the sugar components of the honeydew of these three species by HPLC. The major components of honeydew were sucrose, fructose, and melezitose for A. gossypii; glucose and fructose for R. padi; and glucose, fructose, and melezitose for M. sacchari. Maltose and trehalose were minor components of the honeydew of these species. We investigated the influence of sugars, including three artificial aphid honeydews, six sugar components, and distilled water, on the longevity of unmated A. aphidimyza. Both females and males attained the greatest longevity on sucrose and artificial honeydew of A. gossypii. Mean longevities of both females and males were shortest when they were provided only with water. We conducted another experiment in which a mated female was released in a cage with an eggplant seedling infested with A. gossypii and fed with sucrose or only water. Females fed with sucrose lived significantly longer and had higher lifetime fecundity than those fed only water.
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