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United States Department of Agriculture

Agricultural Research Service

Title: The Effects of Photorhabdus Luminescens Toxin Complex a on the Colorado Potato Beetle, Larvae, Leptinotarsa Decemlineata (Coleoptera: Chrysomelidae).

Authors
item Blackburn, Michael
item Domek, John

Submitted to: National Entomological Society of America Annual Meeting
Publication Type: Abstract Only
Publication Acceptance Date: August 1, 2000
Publication Date: N/A

Technical Abstract: The bacterium Photorhabdus luminescens, an enteric symbiont of Heterorhabditid nematodes, produces a number of high molecular weight insecticidal protein toxins. One of these toxins, Toxin complex a (Tca), has been found to inhibit growth of second instar Colorado potato beetle larvae in a dose dependant manner. Fifty percent inhibition of growth occurred at a Tca concentration of approximately 0.14 parts per million. Second instar larvae fed diet containing Tca for 24 h exhibited pathology of the midgut epithelium which included loss of apical microvilli and blebbing of cytoplasmic vesicles into the gut lumen.

Last Modified: 10/19/2014
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