. Bulletin. Agriculture -- Ontario. 27 The Rose-Chafer (Macrodactylus subspinosas), Fig. 40. Later in the season, when the blossoms appear on the vines, another beetle, but of a different family, makes an attack upon them. It is commonly called the Rose-beetle or Rose-chafer, from its habit of devouring- the bloom of roses, but it is even a worse enemy of the grape, as it destroys the blos- soms and with them all hope of fruit. Fortunately it is somewhat local, and is not everywhere a pest. During 1906 it appeared in great numbers in various places from the outskirts of Toronto, which seems to
. Bulletin. Agriculture -- Ontario. 27 The Rose-Chafer (Macrodactylus subspinosas), Fig. 40. Later in the season, when the blossoms appear on the vines, another beetle, but of a different family, makes an attack upon them. It is commonly called the Rose-beetle or Rose-chafer, from its habit of devouring- the bloom of roses, but it is even a worse enemy of the grape, as it destroys the blos- soms and with them all hope of fruit. Fortunately it is somewhat local, and is not everywhere a pest. During 1906 it appeared in great numbers in various places from the outskirts of Toronto, which seems to be its eastern limit at present, to the County of Essex ;» it has been abundant for some years in the neighborhood of London, but does not appear to extend much farther Fig. 40.—Rose Chafer (Macrodactylut subspinosus). a beetle, b, larva, c and d mouthparts of same, e pupa, / injury to leaves and blossoms with beetles, natural size, at work. (After Mariatt, Dept. Agriculture.) The larva lives upon the roots of grasses in old pastures where the soil is sandy; it has not been found in clay land. The eggs are laid by the female an inch or two below the surface of the ground, and the young larvse gradually grow to maturity during the summer and spend the winter in that condition, hibernating in a cell that they make somewhat deep down in the earth. In spring they work their way to the surface, transform to pupae and emerge as beetles in June. This destructive stage lasts from three to four weeks. Thev appear suddenly in great swarms, completely covering the bloom that they attack, crawling and sprawling. 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 Ontario. Dept. of Agriculture. Toronto : The Dept.
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