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.