. Elementary entomology . FlG. 389. Mossy rose-gall (Rhodites rosae) (After Comstock) mosslike gall on the stems of roses, and the spongy oak-apple (Amphibolips spongificd)y which looks like a puff-ball on the leaves and stems of oaks, are well-known examples. The adult flies may be easily reared by removing the galls from the plants when fully matured and placing them in any suitable receptacles. Only a few species are of economic importance on cultivated crops, among which may be men- tioned the pithy blackberry-gall (DiastropJius nebulosus), an irregular swelling two to three inches long on
. Elementary entomology . FlG. 389. Mossy rose-gall (Rhodites rosae) (After Comstock) mosslike gall on the stems of roses, and the spongy oak-apple (Amphibolips spongificd)y which looks like a puff-ball on the leaves and stems of oaks, are well-known examples. The adult flies may be easily reared by removing the galls from the plants when fully matured and placing them in any suitable receptacles. Only a few species are of economic importance on cultivated crops, among which may be men- tioned the pithy blackberry-gall (DiastropJius nebulosus), an irregular swelling two to three inches long on blackberry stems, inside which will be found numerous larvae. 3. PARASITIC HYMENOPTERA
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