Ontario Sessional Papers, 1898-99, . e none of this powdery substance and are more frequently formedinside of the leaves hanging on the trees. On St. Josephs Island last summer, Isaw hundreds of maples and other forest trees upon which every leaf contained one ofthese concoons, even the native spruces were so full of them that they appeared as ifpacked in wool. 4 Canker-Worms.—(Paleacrita verndta and Alsophila pometdria.)—Canker-wormshave been very abundant in many parts of the country for a number of years are also two species of these, but they resemble each other so clos
Ontario Sessional Papers, 1898-99, . e none of this powdery substance and are more frequently formedinside of the leaves hanging on the trees. On St. Josephs Island last summer, Isaw hundreds of maples and other forest trees upon which every leaf contained one ofthese concoons, even the native spruces were so full of them that they appeared as ifpacked in wool. 4 Canker-Worms.—(Paleacrita verndta and Alsophila pometdria.)—Canker-wormshave been very abundant in many parts of the country for a number of years are also two species of these, but they resemble each other so closely that to thecausal observer they differ only in name. One is known as the Spring Canker-Worm(Paleacrita verndta) (Fig. 63), and the other as the Fall Canker-Worm (Alsophilapometdria) (Fig. 64). One of the most noticeable differences in the two species appearsin the egg stage. The eggs (Fig. 63 a and b) of the Spring Canker-Worm are oval inform and are laid in the spring in irregular patches hidden under loose bark or inexpanding Fig. of the Fall species are shaped like miniature flower pots, are ranged in regularrows in masses (Fig. 65, a, b, c), and deposited in the late autumn in some prominentplace on the tree. The larvae of both species (Fig. 63 c and 65/) make their appear-ance with the opening of the leaves in the spring. They reach their full size in aboutthree weeks and are then about an inch in length. On account of their peculiarmethod of travelling, by alternately looping and extending their bodies, they are com-monly spoken of as measuring worms. They have another peculiar habit when dis-turbed of suddenly dropping from the tree and suspending themselves in mid air by adelicate silken web which is spun as they drop. Their appearance in this position isgraphically described in the following letter which I received from a correspondentlast June :—
Size: 3021px × 828px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorontariol, bookcentury1900, bookdecade1900, bookyear1906
