. Bulletin - Massachusetts Agricultural Experiment Station. Agriculture -- Massachusetts. 40 MASS. EXPERIMENT STATION BULLETIN 249. NUMBER OF BEETLES- 2607 Figure 8. Time when Flnm Curculio Beetles Enierg"ed from the Soil in Breeding: Cag°es in the Insectary, Waltham., Mass. Birds and Predatory Insects. Although plum curculio beetles are hard and apparently unpalatable food, the U. S. Biological Survey (9) has found them in the stomachs of orioles, grosbeaks, barn swallows, vireos, and thrushes. However, these birds are not sufficiently abundant to provide a noticeable check on this insec
. Bulletin - Massachusetts Agricultural Experiment Station. Agriculture -- Massachusetts. 40 MASS. EXPERIMENT STATION BULLETIN 249. NUMBER OF BEETLES- 2607 Figure 8. Time when Flnm Curculio Beetles Enierg"ed from the Soil in Breeding: Cag°es in the Insectary, Waltham., Mass. Birds and Predatory Insects. Although plum curculio beetles are hard and apparently unpalatable food, the U. S. Biological Survey (9) has found them in the stomachs of orioles, grosbeaks, barn swallows, vireos, and thrushes. However, these birds are not sufficiently abundant to provide a noticeable check on this insect. The grubs are known to be eaten while in the ground by various ground beetles and ants, while lacewings attack the larvae in the fruit, but no outstanding instance of a significant check by predaceous insects has been brought to the attention of the writer in Massachusetts. Parasites. During the observation and rearing of several thousand plum curculio in 1926 and 1927 at Waltham, no parasites were found. In 1928, however, six specimens of a tiny four-winged parasitic fly, tentatively determined as Triaspis aurculionis Fitch, were reared from a large lot of field collected larvae. Records of this parasite in other states show a maximum parasitism of 25 per cent (9), although the general average is less than 3 per Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Massachusetts Agricultural Experiment Station. Amherst, : Massachusetts Agricultural Experiment Station, 1907-1974
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