Abstract
The external larval parasites,Goniozus emigratus (Rohwer) andGoniozus legneri Gordh, which were dominant on navel orangeworn,Amyelois transitella (Walker) in south Texas and in Uruguay and central Argentina, respectively, were successfully established at experimental irrigated almod orchard in California's Central Valley in 1979. Both species had been released for 4 months at rates of ca. 2.500 per ha., and both persisted into the 1980 and 1981 harvests, albeit at lower frequencies than were recorded in 1979. Coexistence with an earlier introduced parasite,Pentalitomastix plethorica Caltagirone, occurred at all experimental sites. Separate k-value analyses indicated significant regulation of their navel orangeworm host during the warm summer season. No such tendency was measured withP. plethorica during June, August, and December samples, indicating the need for further examination of this parasite's potential regulative role in different seasons such as mid-spring and autumn.
Résumé
Les parasites larvaires externes,Goniozus emigratus (Rhower) etGoniozus legneri Gordh, qui sont dominants parmi les ennemis naturels de la teigne de l'oranger,Amyelois transitella (Walker) dans le Texas du sud, en Uruguay et en Argentine centrale, respectivement, ont été installés avec succès en 1979 dans des vergers expérimentaux d'amandiers irrigués dans la Vallée Centrale de Californie. Les deux espèces avaient été lâchées pendant 4 mois à raison d'environ 2500 par ha. Elles se sont maintenues lors des récoltes de 1980 et 1981 mais à des fréquences moindres qu'en 1979. Dans tous les sites expérimentaux il y a eu coexistence avec un parasite introduit précédemment,Pentalitomastix plethorica Caltagirone. Des analyses séquentielles de la valeur k montrent une régulation significative de leur hôte pendant la saison des chaleurs estivales. Une telle possibilité n'a' pas été déterminée dans le cas deP. plethorica lors des échantillonnages de juin, août et décembre, ce qui suscite le besoin d'un examen ultérieur des potentialités de ce parasite comme agent de régulation des populations de la teigne selon les saisons, notamment au milieu du printemps et en automne.
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Legner, E.F., Silveira-Guido, A. Establishment ofGoniozus emigratus andGoniozus legneri [Hym: Bethylidae] on navel orangeworm,Amyelois transitella [Lep: Phycitidae] in California and biological control potential. Entomophaga 28, 97–106 (1983). https://doi.org/10.1007/BF02372133
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DOI: https://doi.org/10.1007/BF02372133