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Reproductive compatibility and insects associated with dendroctonus pseudotsugae coleoptera scolytidae of chihuahua mexico and idaho usa

Reproductive compatibility and insects associated with dendroctonus pseudotsugae coleoptera scolytidae of chihuahua mexico and idaho usa

Folia Entomologica Mexicana (44): 129-142

Cross-mated Douglas-fir beetles from Chihuahua and Idaho produced significantly shorter egg galleries, fewer larval mines and fewer progeny than did pairs of beetles from within either locality. All mating combinations were more productive in Douglas-fir than in western larch. The latter tree is a natural host in Idaho but does not occur south of that state. Beetles from Chihuahua were significantly larger than those from Idaho. Progeny of either cross mating were larger than progeny of Idaho female mated with Idaho males; the trait for large size of progeny may be dominant in Mexican beetles. Comparison of shape and dimensions of male genital capsules disclosed no difference between geographic origin or mating combination. Comparative data were obtained on insects associated with the Douglas-fir beetle. The scolytids, Gnathotrichus sulcatus (Lec.) and Pseudohylesinus nebulosus (Lec.), occur in both areas. Scolytus reflexus Blkm. occurs in Chihuahua while its counterpart in Idaho is S. monticolae (Sw.). The clerid Enoclerus arachnoides (Klug) preys on the Douglas-fir beetle in Chihuahua, while E. sphegeus Fab. replaces it in Idaho. Dolichopodid larvae (Medetera spp.) prey on Douglas-fir beetle larvae in both areas but the species in Chihuahua was not determined specifically. The common braconid parasite (Coeloides vancouverensis (Dalla Torre)) of Douglas-fir beetle larvae in Idaho was not found in Chihuahua. The possibility of infertility of Douglas-fir beetle hybrids for potential use in control and introduction of C. vancouverensis into Chihuahua should be considered.

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Accession: 006316619

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