Abstract
During the survey of the natural enemies ofSaccharicoccus sacchari in Barbados in 1968 and 1969, the following six indigenous species of natural enemies were recorded: —Hyperaspis trilineata andNephus sp.(Coccinellidae); Oligota barbadorum (Staphylinidae); an unidentified Cecidomyid(Cecidomyidae); Pseudaphycus mundus (Encyrtidae) andAspergillus sp. (Aspergillacae).
Of these,H. trilineata was found in fair numbers in the Westmoreland (St. James) area only;Aspergillus sp. was more abundant during the wet season, while the other species were recorded usually in small numbers from most parishes.
As the indigenous natural enemies do not provide effective control of the pest, three exotic predators and one parasite were introduced into Barbados, through the Commonwealth Institute of Biological Control.Cryptolaemus montrouzieri, Hyperaspis sp. andNephus sp. were obtained from India andAnagyrus saccharicola from East Africa. OnlyA. saccharicola became established. It was recovered soon after its release and, augmented by additional releases, spread rapidly. In January 1972, the levels of parasitism in the dry, intermediate and high rainfall areas were: 8.3, 9.0 and 9.7%.
Résumé
Au cours d'une enquête effectuée dans l'île des Barbades en 1968 et 1969, six ennemis naturels deSaccharicoccus sacchari ont été observés. Ce sont:Hyperaspis trilineata, Nephus sp.(Coccinellidae), Oligota barbadorum (Staphylinidae), unCecidomyidae non identifié,Pseudaphycus mundus (Encyrtidae) etAspergillus sp. (Aspergillacae).
H. trilineata a été trouvé en assez grand nombre, mais seulement dans la région de Westmoreland (St. James).Aspergillus sp. était plus abondant pendant la saison humide; les autres espèces ont été rencontrées en petit nombre dans presque toutes les localités.
Puisque les ennemis naturels indigènes ne sont pas efficaces contre l'insecte nuisible, 3 prédateurs et un parasite d'origine étrangère ont été introduits aux Barbades par les soins du «Commonwealth Institute of Biological Control»:Cryptolaemus montrouzieri, Hyperaspis sp. etNephus sp. provenaient de l'Inde etAnagyrus saccharicola d'Afrique orientale. SeulA. saccharicola réussit à s'implanter; il a été retrouvé peu après sa libération dans l'île et, après de nouvelles introductions, il s'est rapidement répandu. En janvier 1972, les taux de parasitisme, dans les régions sèches, intermédiaires et à pluies abondantes étaient respectivement de: 8,3, 9,0 et 9,7%.
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Alam, M.M. The establishment ofAnagyrus saccharicola Timb. [Hymenoptera: Encyrtidae] in Barbados, West Indies, against the sugarcane mealybug,Saccharicoccus sacchari (Ckll.) (Hemiptera: Coccidae]. Entomophaga 17, 357–363 (1972). https://doi.org/10.1007/BF02371644
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DOI: https://doi.org/10.1007/BF02371644