Abstract
The objective of this work was to compare biological aspects and life table parameters of the coccinellids Harmonia axyridis, Cycloneda sanguineaand Hippodamia convergens. Insects were fed eggs of Anagasta kuehniella, and reared at 24.5±1ºC, 70±10% relative humidity, with a 12 hour photophase. Hippodamia convergenstook about 1.6 day to complete development, longer than H. axyridis, and 2.4 day longer than C. sanguinea.At immature stages, H. axyridisexhibited the highest survival percentage (49.2%), in comparison to the other coccinellids. For mean adult longevity, H. convergenswas deficient, in comparison with the other species. Mean period of pre oviposition was the longest in C. sanguinea; the longest oviposition time occurred for H. axyridis; and the post oviposition period was similar between the coccinellids. Considering the reproductive parameters, H. axyridisshowed the best performance in all aspects. For life table, the values of H. convergenswere higher than, although close, to those of H. axyridis. Nevertheless, the high net reproductive rate of H. axyridis showed this species potential to increase population size. The biological characteristics of the exotic H. axyridis favors its invasion and establishment in Brazil, corroborating results noticed in other countries.
Highlights
The Coccinellidae family (Coleoptera) is of great economic and ecological importance, due principally to the predatory habit exhibited by the majority of them
Despite the benefits it offers as a biological control agent, H. axyridis is perhaps better know for its adverse impacts
H. convergens took about 1.6‐day longer than H. axyridis and 2.4‐day longer than C. sanguinea
Summary
The Coccinellidae family (Coleoptera) is of great economic and ecological importance, due principally to the predatory habit exhibited by the majority of them. Many coccinellids prey on pests of agricultural concern and are well‐known biological control agents with various successful cases described in the literature (Roy & Migeon, 2010). Harmonia axyridis (Pallas 1773) (Coleoptera: Coccinellidae), originally from Central Asia, has been introduced in many countries for the control of aphids and other insect pests, but recent reports indicate that the species has caused serious problems for the native insect community (Vilcinskas et al, 2013). Despite the benefits it offers as a biological control agent, H. axyridis is perhaps better know for its adverse impacts. Despite the benefits it offers as a biological control agent, H. axyridis is perhaps better know for its adverse impacts. Koch & Galvan (2008) reviewed the North American experience with H. axyridis, focusing on these adverse impacts, which have been arranged into three general categories: on non‐target arthropods, on fruit production, and impacts as a household invader
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