. Agriculture of Maine : ... annual report of the Commissioner of Agriculture of the State of Maine. Agriculture -- Maine. CANKER WORMS. 8l pots and are attached to the bark, in exposed situations, in masses of from 60 to 200, placed side by side as seen in figure 40, e. The eggs highly magnified, are shown in figure 40 a and 40 h. The eggs are deposited in fall or early winter (sometimes in mild winters as late as [March). They hatch about the same time as those of the other species and the larvae act in a similar manner, entering the ground about the same time. Instead of forming- a cell lin
. Agriculture of Maine : ... annual report of the Commissioner of Agriculture of the State of Maine. Agriculture -- Maine. CANKER WORMS. 8l pots and are attached to the bark, in exposed situations, in masses of from 60 to 200, placed side by side as seen in figure 40, e. The eggs highly magnified, are shown in figure 40 a and 40 h. The eggs are deposited in fall or early winter (sometimes in mild winters as late as [March). They hatch about the same time as those of the other species and the larvae act in a similar manner, entering the ground about the same time. Instead of forming- a cell lined with ^. <n c 1. 1 ^ Figure 40—Fall canker "wonn; a. silk, however, this species spins a ami ^. egg=', enlarged ; c. segment ' ^ f f of larva enlarged; e. egg cluster; tough cocoon, and the moths come ^- ^"^^ giown larva. forth and begin laying eggs in October and November. HOW TO FIGHT CAXKER-WORMS. The natural enemies of the canker-worms, including Ichneu- mon, Tachina and Chalcid flies, certain wasps and beetles, and various kinds of birds, are so numerous as to prevent serious damage save in exceptional years. In the absence of these nat- ural enemies, however, or when the weather conditions are spe- cially favorable to the increase of the worms, active measures must be taken to save the trees. One of the surest preventive measures is to place a band of tarred paper about the tree in [March and smear it with printers' ink, thus preventing the ascent of the female moths and the deposit of eggs. In case the bark is very rough, it should be scraped smooth to prevent the insects from crawling up behind the paper. The ink must be renewed often enough to prevent hardening, or it will be of no use. If the fall canker-worm is present, of course the treatment must begin in October. If the trees are already attacked, jarring the limbs will cause many of the worms to spin a thread and drop to the ground. If the band of printers' ink is in place they will be unable to
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