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The Biology, Medical Significance and Control of Processionsry Caterpillars

Introduction Processionary caterpillars, the larvae of a number of species of moth, are equipped with barbed poison hairs which may cause 1i>evere dermal irritation when they come into contaot with human skin. These caterpillars are common in many parts of the world where Service personnel are stationed, and have caused particular problems in Cyprus, Hong Kong and parts of BAOR. This defensive mechanism and the processionary behaviour of the larva, is characteristic of the four species involved, Thaumatopoea pityocampa, T. wilkinsoni, T. processionea and T. pinivora.