. Injurious insects : how to recognize and control them . Insect pests; Insect pests. -Adult of the Army ^^'o^nl. Original. Tlie winter is passed as half-gnnvii larva^ in the ground. In the spring these larva^ transform, moths emerge, and in a few weeks another generation of worms is at work. It is this generation that is ajit to reaeh sueh ntunbers as to prove a serious pest. In the Xortli tliere are three broods in a season ; in the Sontli five or six. Normally the insect is iiekl down to modi-rate numbers by its natural enemies. When the worms reaeh e.\- cessive abundance and begin to trave
. Injurious insects : how to recognize and control them . Insect pests; Insect pests. -Adult of the Army ^^'o^nl. Original. Tlie winter is passed as half-gnnvii larva^ in the ground. In the spring these larva^ transform, moths emerge, and in a few weeks another generation of worms is at work. It is this generation that is ajit to reaeh sueh ntunbers as to prove a serious pest. In the Xortli tliere are three broods in a season ; in the Sontli five or six. Normally the insect is iiekl down to modi-rate numbers by its natural enemies. When the worms reaeh e.\- cessive abundance and begin to travel from one field to another, invasion may be stojiped by plowing three or four furrows, and main- taining a thick dust in these if possible. As worms collect in the furrows the\- may lie killed with a drag, or by sprinkling them with kerosene or kerosene emulsion. Another measure sometimes ad\ is to apply a heavy dose of Paris .green to a strip a few yartls wide on the side of the field that is tlrreat- ened. Or poison bran mash may lie used. It is advis- able to plow in the fall fields in which the worms ha^-e been numerous in late sum- mer, in order to destroy as -The Fall .Vrinyttorm. m:i"y oi the hibernating oiilaiKcd. Original. larva? as Fic The Fall Army Worm (Laphijgina frugiperda S. and A.) This siiceies is related to the " army worm," but whereas the latter reaches its periods of occasional destructive abundance in the early sunnner ntonths, the fall army worm becomes a pest in the latter part of the sununer. usually in August. The full-grown worm is dark in color, about 11 inches long, and has a yellowish stripe down the middle of its back. Within this stripe, on each segment, are four. 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 O'Kane, Walter Collin
Size: 2510px × 996px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsectp, bookyear1912
