Abstracts
Summary
A three-season field evaluation showed that eggplants (Solanum melongena) are very tolerant to damage caused by the two-spotted spider mite, Tetranychus urticae. Although large numbers of the predacious mites, Neoseiulus fallacis or Phytoseiulus persimilis were released, biological control of the two-spotted spider mite could not be sustained in the field. Based on a preliminary comparison of yield in both sprayed and unsprayed plots and on a three-year qualitative assessment, a tentative action threshold of 600 two-spotted spider mites per leaf would not decrease yield and would reduce the number of acaricide treatments per season. The new acaricide spirodiclofen was effective against the two-spotted spider mite in a preliminary trial.
Résumé
Une évaluation sur trois saisons a démontré que l’aubergine (Solanum melongena) est très tolérante au tétranyque à deux points, Tetranychus urticae. Malgré le grand nombre d’acariens prédateurs, Neoseiulus fallacis ou Phytoseiulus persimilis, relâchés au champ, la lutte biologique contre le ravageur n’a pu être maintenue au champ. Basé sur une évaluation préliminaire de la récolte dans les parcelles traitées et non traitées et sur une évaluation qualitative de trois années, un seuil provisoire de traitement de 600 tétranyques à deux points par feuille réduirait le nombre de traitements contre ce ravageur sans affecter la récolte. Le nouvel acaricide spirodiclofen a été efficace contre le tétranyque à deux points dans un essai préliminaire.
Appendices
References
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