Insect enemies of the pine in the Black Hills forest reserve : an account of results of special investigations, with recommendations for preventing losses . ^^ bores out through the bark (/ ^>^^^) CTS\r^ (fig. 1, d), and flies, with other adults of the sameand other broods, in searchof other living trees inwhich to excavate galleriesand deposit eggs for an-other brood. SECONDARY ENEMIES. Many other species ofbark beetles and otherbark and wood infestinginsects were found asso-ciated with the primaryenemy in the partly livingbark of infested and dyingtrees, but none of them wTere found makin
Insect enemies of the pine in the Black Hills forest reserve : an account of results of special investigations, with recommendations for preventing losses . ^^ bores out through the bark (/ ^>^^^) CTS\r^ (fig. 1, d), and flies, with other adults of the sameand other broods, in searchof other living trees inwhich to excavate galleriesand deposit eggs for an-other brood. SECONDARY ENEMIES. Many other species ofbark beetles and otherbark and wood infestinginsects were found asso-ciated with the primaryenemy in the partly livingbark of infested and dyingtrees, but none of them wTere found making an independent attack onliving trees. Therefore they must be considered as secondary ene-mies, which follow the leader in the attack, and merely contribute tothe rapid and certain death of the trees thus infested. Th> Oregon Tomicus (Tomicus ovegoni Eichh.).—This is a small red-dish to black bark beetle, individuals of which vary in length mm. to 4 mm. It follows closely the attack of the pine-destroyingbeetle, and (Miters the bark on the large and medium sized branchesand toward the top of the main stem. Several females excavate radi-. Fig. 2.—Work of the Oregon Tomicus (Tomicus ovegoni Eichh.).Primary galleries and larval mines in inner bark, a, En-trance; b, central chamber excavated through inner bark;c, egg galleries; d, location of central chamber not exca-vated through inner bark. Reduced about one-half (origi-nal). This species lias heretofore been erroneously identified as D. terebrans and and will probably be found so labeled in some collections. 11 ating galleries from a single entrance and a central chamber (fig. 2, aand b). The central chamber may («), or may not (b), extend throughthe inner layers of bark and groove the surface of the wood, but theradiating galleries are nearly always grooved in the surface of thewood, as are also the egg cavities, which are excavated at short inter-vals along the sides (figs. 3 and 4). These groove
Size: 1457px × 1714px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookidinsecp00unit, bookyear1902
