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Competition and co-operation between Chrysocharis laricinellae and Agathis pumila on Larch casebearer in Quebec



Competition and co-operation between Chrysocharis laricinellae and Agathis pumila on Larch casebearer in Quebec



Canad. Ent 102(5): 602-12



The following is based partly on the author's abstract. Agathis pumila (Ratz.) and Chrysocharis laricinellae (Ratz.) compete for their common host, Coleophora laricella (Hb.) . An analysis of the mechanism of this competition, based on a two-year study in a stand of larch in Quebec during 1967-68, is presented. A. pumila attacks host larvae in the first and second instars, is well protected against winter mortality and is naturally synchronised with its host, whereas Chrysocharis laricinellae attacks hosts in the third and fourth larval instars and the pupal stage, is not well synchronised with them and has high winter mortality. A. pumila does not kill its host before pupating, but retards its development, and since C. laricinellae is better synchronised with the parasitized than the unparasitised hosts, which quickly become adult, and the ovipositing females do not discriminate between them, multiple parasitism occurs in which C. laricinellae displaces A. pumila. Larvae parasitized by A. pumila provide an important source of hosts for the second and part of the third generation of C. laricinellae and assist its numbers to build up to a point at which it becomes host-regulative by massive attack. Competitive displacement of A. pumila by C. laricinellae is less frequent than expected because of the basically different ways in which the two parasite species spread and search for, select and attack hosts. A. pumila may suffer about 50% loss from multiple parasitism, but apparently this does not affect its survival potential, its reproductive rate and its ability to provide significant partial control of Coleophora.

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Accession: 014392671

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DOI: 10.4039/ent102602-5


Related references

Competition and co-operation between Chrysocharis laricinellae and Agathis pumila on larch cascbearer in Quebec. Can. Ent 102(5): 602-612, 1970

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