Evaluation of vinyl house release of Aphidius colemani and Aphidoletes aphidimyza for controlling cucumber [Cucumis sativus]-infesting Aphis gossypii
1998
Sato, Y. (Kyoto Prefectural Univ. (Japan). Faculty of Agriculture) | Takada, H. | Katayama, J.
Commercially available insect natural enemies, Aphidius colemani and Aphidoletes aphidimyza, were released 4 times from May 2, 1997 with one-week intervals in cucumber-growing vinyl house (setting: March 8, harvesting: mid-April to late June) at Kyoto, to evaluate them as biological control agents against Aphis gossypii. The aphid increased to a high density on a few plants in mid-May and reached great abundance on most plants in mid-June. The crop showed a decrease of one-third compared with that of the insecticide-applied house. Sticky trap catches of A. colemani increased from May 15 and the primary parasitoids emerging from pale brown mummies of A. gossypii collected were all A. colemani after May 23. The parasitism of A. gossypii primarily by A. colemani was 50-82 % during May and June. Our of about 1,000 pale brown mummies obtained by random sampling, only 13 % yielded A. colemani, whereas 38 % yielded hyperparasitoids. A. aphidimyza was present always in low numbers, possibly due to high mortality of mature larvae on mulch. Indigenous parasitoids Ephedrus nacheri and Lipolexis gracilis played important roles to some extent. Five groups of indigenous predators were found among A. gossypii colonies. The causes of failure in controlling the aphid by using natural enemies were discussed and improvements were proposed
Afficher plus [+] Moins [-]Mots clés AGROVOC
Informations bibliographiques
Cette notice bibliographique a été fournie par Agriculture, Forestry and Fisheries Research Information Technology Center
Découvrez la collection de ce fournisseur de données dans AGRIS