Economic entomology for the farmer and fruit-grower . economicentomolo01smit Year: 1906 THE INSECT WORLD. 265 americana, and certain varieties of grapes are occasionally in- jured by its larva. Feeding in colonies, as it does, the insect is easily checked by local applications of the arsenites. Fig. 286. Grape-leaf on which larva- of Hai lisina arnevicana are feeding. We now enter into a series of species the caterpillars of which are known as 'woolly bears,' from the fact that they are all clothed with long hair. In some cases this hair is so dense that the body of the caterpillar itself
Economic entomology for the farmer and fruit-grower . economicentomolo01smit Year: 1906 THE INSECT WORLD. 265 americana, and certain varieties of grapes are occasionally in- jured by its larva. Feeding in colonies, as it does, the insect is easily checked by local applications of the arsenites. Fig. 286. Grape-leaf on which larva- of Hai lisina arnevicana are feeding. We now enter into a series of species the caterpillars of which are known as 'woolly bears,' from the fact that they are all clothed with long hair. In some cases this hair is so dense that the body of the caterpillar itself cannot be seen at all, and all these are of the Ardiid series. They spin a small quantity of silk only, and use the hair with which they are clothed in con- junction with it to form the cocoon. Under the microscope it may be seen that it is furnished with small spurs or branches, by means of which the insect is able to produce a felt-like material, needing only a small quantity of silk to hold it together in a tissue sufficiently firm for its purpose. Perhaps the majority of the caterpillars of this series feed upon low plants, and frequently it does not matter much what. Plantain seems to be a common food for many species, but they eat grasses as well, and, indeed, almost anything. They are often found in gardens attacking lettuce and cabbage, and on cabbages they are sometimes trouble- some in the field. Some are almost white or yellowish, and vary
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