Florida Entomologist (2000) 83, 428-437

From Pestinfo-Wiki
Jump to: navigation, search

Heather J. McAuslane, Alvin M. Simmons and D. Michael Jackson (2000)
Parasitism of Bemisia argentifolii on collard with reduced or normal leaf wax
Florida Entomologist 83 (4), 428-437
Abstract: Collard, Brassica oleracea var. acephala L., cultivars with reduced leaf wax (i.e., glossy phenotypes) possess ovipositional antixenotic resistance to the silverleaf whitefly, Bemisia argentifolii Bellows and Perring (Homoptera: Aleyrodidae). We investigated parasitism by 2 parasitoids of B. argentifolii reared on 2 phenotypes of the collard cultivar 'Green Glaze', differing in amount of leaf wax. When Eretmocerus sp. (Hymenoptera: Aphelinidae) parasitoids were given a choice between parasitizing whitefly nymphs on glossy and normal-wax collard, there were no significant differences in the number of parasitized nymphs on the 2 plant phenotypes. However, 4.5 times more Encarsia pergandiella Howard (Hymenoptera: Aphelinidae) emerged from whiteflies on glossy than on normal-wax plants. In a no-choice test, the number of Eretmocerus sp. emerging on glossy and normal-wax plants did not differ significantly. In a similar no-choice test, more than twice as many E. pergandiella emerged from whiteflies on glossy collard than on normal-wax collard. Time to 50% emergence for whiteflies and both species of parasitoids did not differ on the 2 collard types in any of the no-choice tests. We conclude that management of B. argentifolii populations can be improved on collard, and probably other B. oleracea vegetables, through the use of reduced leaf wax cultivars that have antixenotic resistance to B. argentifolii and have no detrimental effects, possibly even beneficial effects, on important whitefly natural enemies.

Cultivos de acelga, Brassica oleracea var. acephala L., con reducción de cera foliar (por ejemplo, fenotipos glaseados) poseen resistencia antixenotica oviposicional a la mosquita blanca, Bemisia argentifolii Bellows and Perring (Homoptera: Aleyrodidae). Investigamos el parasitismo por 2 parasitoides de B. argentifolii criados en 2 fenotipos del cultivo de acelga "Glaseado Verde", con diferencia en la cantidad de cera foliar. Cuando especies parasitoides de Eretmocerus (Hymenoptera: Aphelinidae) fueron dadas opción entre parasitar ninfas de mosquita blanca sobre acelga glaseada o con cera normal, no hubieron diferencias significativas en el numero de ninfas parasitadas de los 2 fenotipos de plantas. Sin embargo, emergieron 4,5 veces mas Encarsia pergandiella Howard (Hymenoptera: Aphelinidae) de mosquitas blancas en plantas glaseadas que en plantas con cera normal. En una prueba sin opción, el numero de especies de Eretmocerus emergiendo en plantas glaseadas y con cera normal no difirió significativamente. En una prueba similar sin opción, mas de 2 veces E. pergandiella emergieron de mosquitas blancas en acelga glaseada que en acelga de cera normal. El tiempo para 50% de surgimiento de mosquitas blancas y las dos especies de parasitoides no difirió en los 2 tipos de acelga en cualquiera de las pruebas sin opción. Concluimos que la administración de populaciones de B. argentifolii puede ser mejorada en acelga, y probablemente otros vegetales de B. oleracea, a través del uso de cultivos con cera foliar reducida que tienen resistencia antixenotica a B. argentifolii, y que no tienen efectos perjudiciales, posiblemente hasta efectos beneficiosos, a importantes enemigos naturales de la mosquita blanca.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Full text of article
Database assignments for author(s): Heather J. McAuslane, Alvin M. Simmons, D. Michael Jackson

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
environment/habitat manipulation


Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Bemisia tabaci biotype MEAM1 Cabbage (Brassica oleracea)
Encarsia pergandiella (parasitoid) Bemisia tabaci biotype MEAM1 Cabbage (Brassica oleracea)