Economic entomology for the farmer Economic entomology for the economicentomolo00smit_0 Year: 1896 142 AA^ ECONOMIC ENTOMOLOGY. Fig. 104. song may be heard at all periods of the day and until late into the night, from the end of May to nearly the end of June, louder and more intense on warm or hot days. No injury is done by the insects in feeding, but their egg-laying habits often cause considerable trouble. Though the larvs feed under ground, the eggs are laid in the twigs and branches of trees ; a series of slits being cut by the powerful ovi- positor of the female, forming smooth
Economic entomology for the farmer Economic entomology for the economicentomolo00smit_0 Year: 1896 142 AA^ ECONOMIC ENTOMOLOGY. Fig. 104. song may be heard at all periods of the day and until late into the night, from the end of May to nearly the end of June, louder and more intense on warm or hot days. No injury is done by the insects in feeding, but their egg-laying habits often cause considerable trouble. Though the larvs feed under ground, the eggs are laid in the twigs and branches of trees ; a series of slits being cut by the powerful ovi- positor of the female, forming smooth chambers in w^hich the eggs are arranged in series. There is nothing to be done when such a brood occurs except take the injury and make the best of it. Of course valuable plants or trees can be protected by mos- quito-netting, but my statement applies to ordinary farm and or- chard crops. The fact that we know when the insects are to appear makes it possible for the fruit-grower to guard himself to some extent by not setting out voun^ stock. On old trees no serious injury will be done, and if no pruning is attempted during the winter preceding, the insects will probably find an abundance of useless twigs to oviposit in. Young trees, however, are some- times so injured as to make them practically useless, either by com- pletely spoiling the shape, or by so weakening the main branches that they never become strong enough to bear a proper top. Wherever the English sparrow has been introduced, the period- ical cicada is doomed. These birds seem to have an intense hatred for the insects, attacking and pulling them to pieces in 6 a: Cicada egg-punctures: at a, freshly made ; at 3, old and distended.
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