Abstract
Two entomopathogenic nematodes,Steirnernema carpocapsae andS. feltiae were evaluated in the laboratory and under field conditions against larvae ofConorhynchus mendicus, a pest of sugar beet in the Gharb area of Morocco. Nematodes were applied in an artificially infested field using a knapsack sprayer either during the day or in the evening after sunset. The number of insect cadavers recovered from both soil and sugar beet plants was greater in the treated plots compared with the untreated ones. The percent reduction in live larvae was significantly greater in theS. carpocapsae treated plots (89.5% and 59.5% for night an day application respectively) compared with those treated withS. feltiae (68.5% and 28% respectively). The efficacy of entomopathogenic nematodes was therefore increased by application at night particularly in the case ofS. carpocapsae where control was maintained for 45 days.
Résumé
L'efficacité de deux espèces de nématodes entomopathogènes,Steinernema carpocapsae etS. feltiae a été testée au laboratoire et au champ contre les populations larvaires du cléone mendiantConorhynchus mendicus. Ce curculionide est l'un des ravageurs les plus importants de la betterave sucrière au Gharb (Maroc). Les nématodes entomopathogènes ont été appliqués au moyen d'un pulvérisateur manuel dans un champ artificiellement infesté, pendant le jour et pendant la nuit.
Les résultats obtenus montrent que le nombre de cadavres d'insectes récupéré était important dans les parcelles traitées comparé aux parcelles non traitées. Par ailleurs, la réduction des populations larvaires du ravageur était plus importante dans les parcelles traitées avecS. carpocapsae (89.5% et 59.5% respectivement pour l'application de nuit et de jour), que dans les parcelles traitées avecS. feltiae (68.5% et 28% respectivement).
L'efficacité des nématodes entomopathogènes s'est améliorée avec l'application de nuit particulièrement dans le cas deS. carpocapsae où le contrôle des larves était maintenu pendant 45 Jours.
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Akalach, M., Wright, D.J. Control of the larvae ofConorhynchus mendicus (Col.: curculionidae) bySteinernema carpocapsae andSteinernema feltiae (nematoda, steinernematidae) in the gharb area (Morocco). Entomophaga 40, 321–327 (1995). https://doi.org/10.1007/BF02373719
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DOI: https://doi.org/10.1007/BF02373719