. Annual report. Entomological Society of Ontario; Insect pests; Insects -- Ontario Periodicals. Egg in situ. Larva, just hatched. layer. They were found most commonly around Jenticels, near buds and branches, or in growths caused by pruning. These eggs hatch in late August, September and October. The young grubs feed on the bark and grow slightly before hibernation. In these small chambers, just below the surface of the outer bark, the young larvae pass the winter. Feeding begins early in the spring, the larvae attacking the cambium layer and often girdling the trees. In late June they bore i
. Annual report. Entomological Society of Ontario; Insect pests; Insects -- Ontario Periodicals. Egg in situ. Larva, just hatched. layer. They were found most commonly around Jenticels, near buds and branches, or in growths caused by pruning. These eggs hatch in late August, September and October. The young grubs feed on the bark and grow slightly before hibernation. In these small chambers, just below the surface of the outer bark, the young larvae pass the winter. Feeding begins early in the spring, the larvae attacking the cambium layer and often girdling the trees. In late June they bore into the heart of the trees, forming the pupal cells. Pupation takes place during July and the adults begin emerging in late July and August. The beetles feed for a short time before beginning to oviposit. Up to the time that the writer undertook Avork on this insect no efficient control measures liad been devised. The general recommendations had been the cutting out and destruction of infested trees. Sciioene in Bulletin 286 of the New York Experiment Station stated that the use of arsenicals during July and August would poison the greater majority of the beetles and reduce infestations in nurseries. In practice it has been found tliat though Paris green and lead arsenates were used in large quantities it had no effect in reducing the annual loss. At the time (1914) the author began to look into this problem several large nurseries in New York. 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 Entomological Society of Ontario; Ontario. Dept. of Agriculture. Toronto, The Society
Size: 1523px × 1640px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, booksubjectinsectp, bookyear1872
