. Annual report of the State Entomologist of Montana . sides attacking the apple it is found in various other woodyplants including crabapple, quince and pear. Experience has shownthat trees are verv much more liable to be attacked if the trunks aresurrounded by grasses, weeds or other vegetation. The adults appear in the spring of the year and the females de-posit their eggs as near to the ground as possible. The eggs hatchin about three weeks and the larvae work their way under the barkand feed for the first season in the sapwood. During the second sea-son they feed in the deeper heartwood a
. Annual report of the State Entomologist of Montana . sides attacking the apple it is found in various other woodyplants including crabapple, quince and pear. Experience has shownthat trees are verv much more liable to be attacked if the trunks aresurrounded by grasses, weeds or other vegetation. The adults appear in the spring of the year and the females de-posit their eggs as near to the ground as possible. The eggs hatchin about three weeks and the larvae work their way under the barkand feed for the first season in the sapwood. During the second sea-son they feed in the deeper heartwood and in the third spring bore tonear the surface where they transform to pupae the adult beetles ap-pearing a little later. The adult is a beautiful insect measuringthree fourths of an inch to an inch in length. The under surfaceof the body is silvery white while the upper surface is brown withtwo longitudinal white stripes. This insect may be introduced into Montana in nursery looking for it the bases of the trunks should be closely Fig. 4. Round-headed Apple-tree Borer: a. larva, from side; b, from above;c, female beetle; d, pupa; all enlarged one-third. (Marlatt, Circular 32, , Div. of Entomology, U. S. Dept. Agr.) 156 MONTANA EXPERIMENT STATION. THE BRONZE APPLE-TREE BEETLE, i This beetle, so far as we are informed, is confined to the North-western States and its economic statns is not fully J^-onnmed. ^ H. Chittenden has given us a good account of what is known re-garding the pest, in which he calls attention to various complaintsregarding it from Washington and Professor C. \^. Piperformerly from Pullman, Washington had sent specimens to reporting serious damage to the apple industry of V/ash-ing ton. The same gentleman later reported that his .irst suspi-cions regarding the weevil had been much allayed by the disco\oryof the fact that its injuries were apparently secondary t^ the fungusdisease known as canker or bla
Size: 1904px × 1313px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectinsects, bookyear1903
