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Role of entomophagous larvae in the infection of the caterpillars of Pieris brassicae L. and Anagasta kuehniella Zell. by Bacillus thuringiensis Berliner



Role of entomophagous larvae in the infection of the caterpillars of Pieris brassicae L. and Anagasta kuehniella Zell. by Bacillus thuringiensis Berliner



Revue de Zoologie Agricole et de Pathologie Vegetale 74(2): 68-84



In order to determine the usefulness or otherwise of the combined use of parasites and preparations of Bacillus thuringiensis for the control of Lepidopterous larvae (cf. last abstract but two), studies were carried out in France on the interrelation of B. thuringiensis with Pieris brassicae (L.) and its gregarious larval parasite Apanteles glomeratus (L.) on the one hand and with Ephestia (Anagasta) kuehniella Zell. and its solitary egg and larval parasite Phanerotoma flavitestacea Fish. on the other hand. From the results of these observations it was concluded that the presence of parasitic larvae within the host larva, by reducing its feeding rate, hinders or delays the infection of the host with B. thuringiensis on the food-plant, but that once the host has become infected, the presence of parasites accelerates the action of the pathogen and hastens the death of the host, by weakening it and in particular by destroying its fatty tissues. If the host larva succumbs to the disease before the parasites have emerged, the parasites also die and the rate of parasitism falls in the next generation. It is therefore important to take into account the type of parasite involved (since solitary parasites weaken the host less rapidly than do gregarious ones), the age of the host and parasite at the time of exposure to the bacterium, and the dose of B. thuringiensis to be applied, before combining control by bacteria with control by parasites. The application of sublethal doses is suggested; this would be economically beneficial by further reducing the food consumption of parasitised larvae without killing them before the emergence of their parasites.

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Role of entomophagous larvae in the infection Bacillus thuringiensis Berliner of Pieris brassicae L. and Anagasta kuehniella Zell. caterpillars. Revue de zoologie agricole et de pathologie vegetale: nd Quarter 74 (2) 68-84, 1975

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