Monday, 15 November 2004
D0181

Evaluation of chrysopid species for control of Toxoptera citricida (Homoptera: Aphididae) in Mexico

J. Isabel López-Arroyo, jila64@yahoo.com, Roberto Canales-Cruz, rcanales_cruz@hotmail.com, Mario A. Miranda-Salcedo, mmiranda8@hotmail.com, and Jesús Loera-Gallardo, loera49@hotmail.com. Instituto Nacional de Investigaciones, Forestales, Agrícolas y Pecuarias, Campo Experimental Gral. Terán, Km. 31 car. Montemorelos-China, Gral. Terán, Nuevo León, Mexico

The objective of this study was to assess the potential use of indigenous predators prevailing in Mexican citrus groves for the control of the brown citrus aphid, Toxoptera citricida Kirkaldy (Homoptera: Aphididae). We tested under lab conditions, the consumption of the exotic aphid by larvae of the green lacewings Ceraeochrysa sp. nr. cincta (Schneider), Ceraeochrysa valida (Banks), Chrysoperla externa (Hagen), and Chrysoperla rufilabris (Burmeister) (Neuroptera: Chrysopidae). During the whole larval stage, the species of Ceraeochrysa consumed 92 (C. valida) and 267 (C. sp. nr. cincta) aphids/larva; meanwhile the species of Chrysoperla preyed 188 (C. externa) and 215 (C. rufilabris) aphids/larva. Under field conditions in two different locations, we evaluated the release of second instar larvae of C. sp. nr. cincta against T. citricida low infestations of citrus trees (mean=13 aphids/shoot), as well as first instar larvae of C. rufilabris against relatively high pest infestations of citrus trees (mean=59 aphids/shoot). Under low pest infestations, C. sp. nr. cincta supressed T. citricida colonies in 66% of the evaluated shoots, when the predator was released at a rate of five larvae/infested citrus shoot. C. rufilabris showed the higher predation rate of T. citricida (52%; P=0.037; Tukey, α=0.05) when the species was released at the rate of 20 larvae/infested citrus shoot. These results have implications for the potential use of chrysopid species for biological control of T. citricida.


Species 1: Neuroptera Chrysopidae Ceraeochrysa valida
Species 2: Neuroptera Chrysopidae Ceraeochrysa sp. nr. cincta
Species 3: Neuroptera Chrysopidae Chrysoperla rufilabris
Keywords: predators, field evaluation

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