Remedies.

As the caterpillars have a habit of advancing in battalions, and it is in this manner only that they are productive of serious harm, the rough grass should be set alight in front of the hosts, so as to check their progress. This should be done at night, as the caterpillars move and feed then. Köllar suggests that the attacked places, where the ground permits, should be surrounded with shallow ditches, or furrows, made deeply with ploughs and as broad as possible, to check them. Pigs, he adds, should be turned in to these enclosures to eat the caterpillars.