. Injurious insects : how to recognize and control them . Insect pests; Insect pests. Fig. 22>. — TheCelerj-Leaf- tier. Lir^-EE. Origi'nal- 2y.—Adult of the Celerj- Le tier. Original. three fourths of an inch long. There are two or three generations out- doors, and an indefinite number in greenhouses. Since the caterpillars feed for the most part concealed, poisons must be applied early in order to be at all effective. Paris green or arsenate of lead may be used. Hand picking L= advisable wherever it can be practiced economically. The Clover-hay Worm i Hi/piopugia coital''-- Fab.) Late in w
. Injurious insects : how to recognize and control them . Insect pests; Insect pests. Fig. 22>. — TheCelerj-Leaf- tier. Lir^-EE. Origi'nal- 2y.—Adult of the Celerj- Le tier. Original. three fourths of an inch long. There are two or three generations out- doors, and an indefinite number in greenhouses. Since the caterpillars feed for the most part concealed, poisons must be applied early in order to be at all effective. Paris green or arsenate of lead may be used. Hand picking L= advisable wherever it can be practiced economically. The Clover-hay Worm i Hi/piopugia coital''-- Fab.) Late in winter the lower layers of clover hay in stack or mow often are found matted together with silk. When the hay is turned over, active wriggling worms are dislodged. In spring the silk cocoons of the pupae will be observed, here and there in the mass. The adult, a small moth expanding less than an inch, emerges in. 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 Collins, b. 1877. New York : The Macmillan Company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsectp, bookyear1912
