. Farm friends and farm foes : a text-book of agricultural science . Agricultural pests; Beneficial insects; Insect pests. FARM FRIENDS AND FARM FOES pupae, and change again later into adult sawflies. The sawfly larvae have three pairs of true legs and six to eight pairs of prolegs. Most of them have the abdomen curved inward in the curious way shown in the picture of the Willow Sawfly larva. The Common Currant Worm is one of the most familiar of the sawflies, and its life history fairly illustrates that of many related species. The small whitish glassy eggs are deposited in spring upon t
. Farm friends and farm foes : a text-book of agricultural science . Agricultural pests; Beneficial insects; Insect pests. FARM FRIENDS AND FARM FOES pupae, and change again later into adult sawflies. The sawfly larvae have three pairs of true legs and six to eight pairs of prolegs. Most of them have the abdomen curved inward in the curious way shown in the picture of the Willow Sawfly larva. The Common Currant Worm is one of the most familiar of the sawflies, and its life history fairly illustrates that of many related species. The small whitish glassy eggs are deposited in spring upon the principal veins of the under side of the lower leaves of currants and gooseberries. In about ten days these eggs hatch into small whitish grubs or larvae that eat cir- cular holes in the leaves. After a few days they cast their skins or molt—a process that is repeated several times dur- ing the next six weeks. In color they change from whitish to plain green, but soon become dotted with black, a color condition that con- tinues until the last molt, when they change to light green with a little yellow on some parts of the body. As they grow older the injury to the leaves increases, and in severe attacks the bushes are completely defoliated. When fully grown in the larval stage, the Currant Worms descend to the ground, seeking shelter beneath the leaves and rubbish. There they spin tough, brown, silken cocoons within which they change to pupae. A short time later they again change to four-winged flies. These come forth early in summer and deposit eggs for a second brood of larvae, most of which pass the following winter within their. Willow Sawfly Larva cocoons. The eggs of the Currant Worm, small as they are, are. 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 Weed, Clarence Moores, 1864-1947. Boston ;
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbenefic, bookyear1910
