. Nature-study; a manual for teachers and students. Nature study. INSECTS, HARMFUL AND OTHERWISE 217 terfly, seen flitting about every garden from early spring till late in fall. The eggs are placed on cabbage, cauliflower, and nasturtium leaves. The caterpillars are very voracious and often do much damage. Pyrethrum powder (insect powder) is a remedy. This butterfly is not a native species, but was introduced from Europe about i860, since which time it has multiphed enormously, having two or three broods a year. A small ichneumon-fly is its para- site, which in a measure acts as a check to it
. Nature-study; a manual for teachers and students. Nature study. INSECTS, HARMFUL AND OTHERWISE 217 terfly, seen flitting about every garden from early spring till late in fall. The eggs are placed on cabbage, cauliflower, and nasturtium leaves. The caterpillars are very voracious and often do much damage. Pyrethrum powder (insect powder) is a remedy. This butterfly is not a native species, but was introduced from Europe about i860, since which time it has multiphed enormously, having two or three broods a year. A small ichneumon-fly is its para- site, which in a measure acts as a check to it. Plant-lice or Aphides, of which there are many species, are harmful to many plants. They are minute insects, and their permanent loca- tion on certain plants amounts almost to parasitism, so much so that most of them have no wings. They are usually named after the kind of plant on which they live: cherry aphis, peach aphis, com aphis, hop aphis, etc. They are generally crowded together in great numbers on the succulent twigs and leaves of plants. They live upon the juices of the plant, which they suck through piercing beaks. Some aphides are green; others, black; some, red. Some are covered with a woolly coat. Some have a pair of little rods at the rear end of the back. These aphides excrete a sweet Uquid, which often drops from them upon the leaves and the walks beneath the trees. This liquid is called honey-dew, and is relished by certain ants, which may often be seen in summer among clusters of black aphides on the. Fig. 73. 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 Holtz, Frederick Leopold, 1870-. New York, C. Scribner's Sons
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