Economic entomology for the farmer Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; . economicentomolo00smit Year: 1906 THE INSECT WORLD. 175 Fui. 150. to destroy the also imported 'cottony cushion-scale,' Icerya purchasi. The relation of these species has been already dis- cussed when speaking of the scale, and will be again referred to in Part III. of this work. There are few rules without excep- tions, and so we find sinners among the lady-birds also,—all belonging to the genus Epilachne. The species are large, hemisp
Economic entomology for the farmer Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; . economicentomolo00smit Year: 1906 THE INSECT WORLD. 175 Fui. 150. to destroy the also imported 'cottony cushion-scale,' Icerya purchasi. The relation of these species has been already dis- cussed when speaking of the scale, and will be again referred to in Part III. of this work. There are few rules without excep- tions, and so we find sinners among the lady-birds also,—all belonging to the genus Epilachne. The species are large, hemispherical, and yellow, with black spots. The larvae are also yellow, elongate oval, with long branched spines. E. borealis is the Northern and Eastern species at- tacking cucumber, melon, and sim- ilar vines, while E. corrupta is found in the West and Southwest, injuring beans. A curious feature in E. borealis is the manner in which the adult marks out a circle at the edge of a leaf and feeds within it until all usable tissue is exhausted, before proceeding to another place to repeat the opera- tion. As these injurious species feed openly in all stages, they can be reached without trouble by any of the arsenites. The family Erotylidce contains some very prettily marked species of quite diverse forms, most of which feed in or on fungi, or may be found under loose bark, and are, therefore, innox- ious. In the genus La/ignria, how- ever, we find an exception, since their larvae live in the stems of clover and other plants. They are very slender, almost cylindrical, from one-fourth to one-half an inch in length, and have the wing-covers blue or Epilachne cotyupla.—A, adult ; B, pupa; C, larva; D, injury on bean.
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