Anais da Sociedade Entomológica do Brasil (1997) 26, 495-502

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Gilvânia R. Vieira, Vanda H.P. Bueno and Alexander M. Auad (1997)
Resposta Funcional de Scymnus (Pullus) argentinicus (Weise) (Coleoptera: Coccinellidae) a Diferentes Densidades do Pulgão Verde Schizaphis graminum (Rond. ) (Homoptera: Aphididae)
[Functional response of Scymnus (Pullus) argentinicus (Weise) (Coleoptera: Coccinellidae) at differents densities of greenbug Schizaphis graminum (Rond.) (Homoptera: Aphididae)]
Anais da Sociedade Entomológica do Brasil 26 (3), 495-502
Abstract: The functional response, search time and handling time of the predator Scymnus (Pullus) argentinicus (Weise) were evaluated. Nymphs of 3rd and 4th instars of the greenbug, Schizaphis graminum (Rond.), were provided as food. The statistical design was randomly in a factorial 3 x 5, with three densities of the greenbug (10, 25, 35 nymphs) and four instars and adult of the predator, in 10 replications. Tests were conducted in an environmental chamber at 25 ± 1°C, 70 ± 10% RH and 14 hours photophase. For both larvae and adults of S. (Pullus) argentinicus the amount of predated nymphs increased with the increment of aphid densities, until reaching a plateau (functional response Type II). Predation in the 4th instar was higher and greater for the density of 35 nymphs compared to the densities of 10 and 25 nymphs. The increment in predation increased, from density 10 to 25, but decreased at density 25 to 35 nymphs. The search time increased gradually with the age of the predator, while the handling time decreased with the age. Adult females presented higher predation and searched faster for prey than males. Searching time decreased with the increase in aphid density.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Portuguese)
Full text of article
Database assignments for author(s): Alexander M. Auad, Vanda Helena Paes Bueno

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
general biology - morphology - evolution

Pest and/or beneficial records:

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

Schizaphis graminum
Scymnus argentinicus (predator) Schizaphis graminum