Baseline toxicity levels to a novel semicarbazone insecticide, metaflumizone were established for 25 field populations of Colorado potato beetle, Leptinotarsa decemlineata Say (Coleoptera: Chrysomelidae),from North America. Excluding the susceptible laboratory strain, 50% lethal concentrations of metaflumizone ranged from 0.57 to 1.31 ppm, while response slopes ranged from 1.92 to 4.24 (average...

BACKGROUND The Colorado potato beetle, Leptinotarsa decemlineata (Say), is a major agricultural pest of commercial potatoes. Pest managers use a combination of control tactics to limit populations, including multiple insecticides. Finding a window of insecticide susceptibility and understanding genetic responses to insecticide exposure during a growing season may provide novel management recomm...

The Colorado potato beetle Leptinotarsa decemlineata (Say) (Coleoptera: Chrysomelidae) in the northern part of the Xinjiang Uygur Autonomous Region has evolved resistance to several pyrethroid and carbamate insecticides. Biological control methods should be a major component of integrated pest management for L. decemlineata. Spinosad and abamectin are two biopesticides that have unique mechanis...

Colonization of potato (Solanum tuberosum [L.]) Þelds by Colorado potato beetle, Leptinotarsa decemlineata (Say) (Coleoptera: Chrysomelidae), has often been recognized as a process that initially results in an edge-biased spatial pattern. We modeled this spatial process by measuring distance of immigration for individual overwintered adults.Distancewasmeasured to the nearest Þeld edge or to the...

Determining the impact of habitat manipulation and predator species diversity on prey suppression is crucial in developing predictions for the impact of biological control programs. Biological control literature contains controversial evidence for the impact of increased predator species diversity and habitat manipulation on prey suppression. We investigated the individual and combined effects ...

Keys in Spanish and English are given for the genera of Chrysomelinae known from Costa Rica. For each genus, a list of species compiled from collections in the University of Costa Rica, the National Biodiversity Institute, and the entomological literature is presented. The genus Planagetes Chevrolat 1843 is recorded for the first time from Central America, and the genus Leptinotarsa Stål 1858 i...

The Colorado potato beetle, Leptinotarsa decemlineata (Say), is one of the most damaging insect pests of potato, Solanum tuberosum L. Novaluron is a relatively new benzoylphenyl urea insect growth regulator with good activity against this pest. Earlier studies revealed that feeding on potato foliage treated with novaluron induces reversible egg hatch inhibition in adult Colorado potato beetles....

Plants respond to pest attack, among other mechanisms, by producing specific proteins with insecticidal properties. Proteins toxic effects on insects have also been discovered in many organisms, especially fungi and bacteria. Due their biological function, represent an important potential the development of more environmentally friendly plant protection methods. Increasing knowledge about mode ...