Printer s ink will do very well
Treatment. The inability of the female to fly gives us an easy way to prevent the larval offspring from getting to the foliage of our trees, for we know that the only highway open to her or her larvæ leads up the trunk. We must obstruct this highway so that no crawling creature may pass. This is readily done by smoothing the bark and fitting close to it a band of paper, and making sure that it is tight enough to prevent anything from crawling underneath. Then smear over the paper something so sticky that any moth or larva that attempts to pass will be entangled. Printer's ink will do very well, or you can buy either dendrolene or tanglefoot.
Fig. 159. Apple-Tree Tent Caterpillar
a, eggs; b, cocoon; c, caterpillar
Fig. 160. The Twig
Girdler at its
Destructive Work
a, the girdler;
b, the egg-hole;
c, the groove cut by girdler;
e, the egg
Source: Agriculture for Beginners
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