Collections: 
0-9 | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z

Image 594 of Annual report. 1921

Part of Kentucky Agricultural Experiment Station

item | thumbnails | details | text | pdf
Download this image
.l ‘,’; Y Q The Strawlicrtry Crown-b0r02· 31 · _, In the latter part of summer grubs shed their skins and ·' become what are called pupae, a stage during which they lie inactive and take no food, the legs and wing-pads folded _i against the body. These pupae are found almost anywhere in T the crown, from the top to the bottom. They are never found ·‘ outside the plant, as far as is known. , \Vhen ready to produce the adult beetle, the skin of the pupa is molted and the adult appears, at first~ perfectly white _;g like the grub and pupa, but gradually becoming yellow and in i J the course of time, brown, then deep chestnut with a couple `, of obscure black spots 011 each side of t·he back. The crust is t now hard and the jaws firm and ready for use. ln this con- . » dition the insect is able to gnaw its way out of the plant, and it appears at the surface to mate and feed. Contrary to prevalent notions as to its habits, it has been fou11d during the past summer to feed very freely on the il leaves, so freely that it might, if exceptionally common, do son1e damage to the plants in this way. Beetles taken fl‘0l1l plants 1 received from Mr. J. B. Grahain, of Bowling Green, during l the past summer, when confined at the Station 011 perfect _ strawberry plants began at once to eat holes of various sizes f in the leaves, riddling some of them badly (Fig. 2) and finally atacking even the leaf petioles, in one case gnawing a petiole } so badly that it broke down. ` ·l The adult beetles live for a long time, for days and even a week or more in the burrows, and for a longer time after coming out. The latest to emerge pass the winter in the adult { condition. Those coming out of the plants in late summer ap- .` pear to live tln·uout the fall, and feed on the leaves as long as f warm weather lasts. Individuals received September Sth and I kept at the Station were alive and active ()<·tober 24th, having during more than a month remained above ground among the Y leaves of the plant. T It is known that in the winter some or all of the beetles fj go into the soil for ltibernattion. Noil taken from infested fields T after frosty weather came on has been passed thrn sieves and V l l