Losses to cotton, what to look for and where to find it, being one of a series of articles in relation to crops, their common diseases and insect pests to which they are subject . at it can be readily dis-tinguished. It is flattened, convex in shape, with manyparallel, longitudinal ridges converging at the center is found usually on the under side of the leaves and, as ageneral thing, toward the top of the plant. As many asfive hundred eggs are laid by each female, sometimesseveral upon one leaf, but never in clusters. The eggs arelaid at night, since the moth is a night flyer. In mid
Losses to cotton, what to look for and where to find it, being one of a series of articles in relation to crops, their common diseases and insect pests to which they are subject . at it can be readily dis-tinguished. It is flattened, convex in shape, with manyparallel, longitudinal ridges converging at the center is found usually on the under side of the leaves and, as ageneral thing, toward the top of the plant. As many asfive hundred eggs are laid by each female, sometimesseveral upon one leaf, but never in clusters. The eggs arelaid at night, since the moth is a night flyer. In mid-sum-mer the larva hatches in from three to four days after theegg is laid, but in spring and autumn this period is very 12 considerably lengthened. After hatching from the egg, theyoung larva feeds at tirst npon the nnder side of the leaf,devouring simply the lower part and not i^assing throughto the upper side until after the first molt. At first thelarva is pale yellow in color, but soon becomes greenish. Before reaching full growth, the caterpillar sheds itsskin fi^e times, the duration of the caterpillar stage beingfrom one to three weeks Early in the season the green. THE SMARTWEED CATERPILLAR (a) larva; (b) cocoon; (c) adult. Natural size. color apjjears to |)redominate, while toward fall the black-ish cateri)illars are more abundant, although at any timeduring the season green and dark worms are seen the normal food of the caterpillar is the leaves, itwill frequently gnaw the tender twigs, but will very rarelydamage the bolls by eating into them, and then only inspots. This contingency, however, generally occurs onlywhen the worms are present in excei)tional numbers andthe supply of leaves becomes exhausted. It is somewhatof a cannibal and, when other food fails, or even rarelywhen, leaves are abundant, it will feed ui)on smaller andweaker individuals of its own kind. In spite of its com-paratively small size and slender form, this larva is un-usually
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Keywords: ., bookcentury1900, bookdecade1910, bookidlossestocott, bookyear1919
