. Annual report of the Commissioner of Agriculture ... Agriculture -- New York (State). 192 Bulletin 176. orchards would suffer much more severely from borers than they do. No plausible cause for this apparent discrepancy has yet beeu sug- gested. Smith found that many eggs had been broken into after they were laid, but could not discover the agent. Possibly many unfertile eggs are laid, or the females may often die before laying their full quota. Worth published a vei'y brief description of the egg of the peach- tree borer in 1823, but it was iirst characterized in detail by Corn- stock in 18
. Annual report of the Commissioner of Agriculture ... Agriculture -- New York (State). 192 Bulletin 176. orchards would suffer much more severely from borers than they do. No plausible cause for this apparent discrepancy has yet beeu sug- gested. Smith found that many eggs had been broken into after they were laid, but could not discover the agent. Possibly many unfertile eggs are laid, or the females may often die before laying their full quota. Worth published a vei'y brief description of the egg of the peach- tree borer in 1823, but it was iirst characterized in detail by Corn- stock in 1880. An egg is shown enlarged at I in tigure 50 (from a photograph), and in figure 51 is shown an egg greatly enlarged (from a drawing). The eggs average .02 of an inch in length and are a little more than half as wide ; many are shown natural size at r/i in figure 50. They are of a light chestnut or mars brown color and are subellipsoidal in form, slightly fiattened with an oval- shaped depression, as shown in figure 51 and at I in figure 50. One end of the egg is either squarely or somewhat obliquely truncate, with a slight depression in the middle where the micropyle is located, as shown in figure 50 at m, which gives a much enlarged view of this end of the. 51.— Egg of peach-tree bo rer greatly enlarged. egg- The whole surface of the egg is so 'sculptured as to have the appearance of being laid with irregularly shaped paving stones, the stones being separated by slight ridges; this peculiar sculpturing of the shell is well shown at I in figure 50, or in figure 51, and still better at m in figure 50. Several persons have seen the female moth depositing her eggs. Comstock (1880) saw one female " deposit upwards of twenty eggs upon different parts of the trunk of one tree, usually about one or two feet from the surface of the ground, in the space of about one hour. The eggs were deposited singly, and were stuck to the sur- face of the bark on their sides by a gummy secre
Size: 1256px × 1990px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthornewyorkstateagricultu, bookcentury1800, bookdecade1890
