. Grasses of North America [microform] : chapters on the physiology, composition, selection, improving and cultivation of grasses, management of grass lands, also chapters on clovers, injurious insects and fungi. Grasses; Forage plants; Graminées; Plantes fourragères. Agrotis fennica is seen as a Fio. 148. Ai^rotis fennica and wing ber ot var. moth in July. It is probably true tlN.^ of all the species that the eggs are Pjq J49 laid soon after the moths appear. In most cases these hatch the same season, and the larviv become partly grown, but do their greatest Fig. 150. mischief the following M
. Grasses of North America [microform] : chapters on the physiology, composition, selection, improving and cultivation of grasses, management of grass lands, also chapters on clovers, injurious insects and fungi. Grasses; Forage plants; Graminées; Plantes fourragères. Agrotis fennica is seen as a Fio. 148. Ai^rotis fennica and wing ber ot var. moth in July. It is probably true tlN.^ of all the species that the eggs are Pjq J49 laid soon after the moths appear. In most cases these hatch the same season, and the larviv become partly grown, but do their greatest Fig. 150. mischief the following May and June. The eggs of A. fennica do not hatch till spring, when the larvse eat raven- ously and grow very rapidly. So we see that in all cases June is the dreaded month when these insects lay heavy tribute on the produce of the farmer. We must depend on the natural enemies very largely to over- come these injurious insects in our grass fields. The extent of the area of grass fields, the number of insects and their con- cealed condition makes all kinds of known warfare impracticable. When they cover a field, as did the A. fennica the meadows in Bay county, Michigan, we may adopt the same remedy as in case of. 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 Beal, W. J. (William James), 1833-1924. New York : H. Holt
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1896
