Summary
Without discussing the problem of the particular role of Epizootics in natural populations, the author examines the different types of relations existing between entomophagous insects and diseases of their hosts.
The consequence for parasites and predators of a possible use of pathogenes as a method of Biological Control of pests is examined with more detail in the case ofP. brassicae L. submitted to sprays with a suspension of spores ofB. thuringiensis Berliner.
It is shown that two hymenopterous parasites (Apanteles glomeratus L. Anilastus ebeninus Grav). can survive the death of their host, under certain circumstances.
The survival ofA. glomeralus is conditionned by its being in the last larval instar on the day of treatment.
The consequence of the disease of the host caterpillar is a shortening of the endoparasitic life of the Braconid.
A similar effect can be observed whenP. brassicae caterpillars are treated with a contact insecticide, but in this case,Apanteles larvae are killed by residues on their emergence from the host.
There is no direct effect of spore suspensions on the larvae of the parasite.
It seems thus possible to adopt bacterial control measures preserving a part of the entomophagous populations.
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I.N.R.A., Laboratoire de lutte biologique de La Minière.
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Biliotti, E. Entomophages et maladies des insectes. Entomophaga 1, 45–53 (1956). https://doi.org/10.1007/BF02377875
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DOI: https://doi.org/10.1007/BF02377875