Abstract
Abstract: The objective of this work was to determine the functional response of the parasitoid Trichogramma pretiosum on Trichoplusia ni eggs at different temperatures (20, 25, and 30ºC) and egg densities (5, 10, 15, 20, 25, and 30 eggs). The logistic regression showed a type-II functional response for all temperatures. The search efficiency of T. pretiosum was reported as 0.049±0.0019, 0.069±0.0042 and 0.068±0.0033 per hour, and the estimated handling times were 1.82±0.0424, 1.69±0.0398, and 1.54±0.0498 hour at 20, 25 and 30ºC, respectively. Females of Trichogramma pretiosum show greater efficiency at 30ºC and a type-II functional response. The parasitism rate decreases, when host density increases.
Highlights
Resposta funcional de Trichogramma pretiosum sobre ovos de Trichoplusia ni a diferentes temperaturas e densidades de ovos
The functional response emerges as a very significant factor to assess the efficiency of a natural enemy, which depends on the balance between host density and efficiency of parasitoid search
Studies that had determined the required proportion of Trichoplusia ni eggs parasitized by Trichogramma pretiosum (Riley, 1879) females, at different temperatures, could offer useful data on the population dynamics, which are relevant to the enforcement of biological control programs
Summary
Resposta funcional de Trichogramma pretiosum sobre ovos de Trichoplusia ni a diferentes temperaturas e densidades de ovos. Studies that had determined the required proportion of Trichoplusia ni eggs parasitized by Trichogramma pretiosum (Riley, 1879) females, at different temperatures, could offer useful data on the population dynamics, which are relevant to the enforcement of biological control programs.
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