. Cooperative economic insect report. Beneficial insects; Insect pests. 1045 INSECTS NOT KNOWN TO OCCUR IN THE UNITED STATES PINE PROCESSIONARY MOTH (Thaumetopoea pityocampa (Denis & Schiffermuller)) Economic Importance: This defoliator is a serious pest of pine forests in Italy, Spain and Switzerland. Outbreaks have been reported also from other countries including Yugoslavia and France. The night-feeding larvae often cause complete ''' defoliation of infested trees. Trees * - weakened by T. pityocampa are frequently attacked by bark beetles. Outbreaks may involve whole forests but do not
. Cooperative economic insect report. Beneficial insects; Insect pests. 1045 INSECTS NOT KNOWN TO OCCUR IN THE UNITED STATES PINE PROCESSIONARY MOTH (Thaumetopoea pityocampa (Denis & Schiffermuller)) Economic Importance: This defoliator is a serious pest of pine forests in Italy, Spain and Switzerland. Outbreaks have been reported also from other countries including Yugoslavia and France. The night-feeding larvae often cause complete ''' defoliation of infested trees. Trees * - weakened by T. pityocampa are frequently attacked by bark beetles. Outbreaks may involve whole forests but do not usually last more than two years. The larvae are capable of producing cases of severe urtication in hiomans. Distribution: Southern Europe,Syria,Turkey. Hosts: Pinus spp. Life History and Habits: South of the Alps, moths emerge at end of June or beginning of July. The females deposit from 100-150 eggs around a cluster of 2 or 3 pine needles, forming a cylinder. The eggs hatch in about 4 weeks and larvae begin feeding on the foliage. Feeding takes place at night. The caterpillars are gregarious and move about in proces- sions of single or double rows. They spin a tough,conspicuous web on the branches in which they retreat during the day and in which they hibernate. The larvae molt 3 times; once in autumn, twice in spring. In May, the caterpillars cease feeding and descend the trunks in processions to pupate in the Defoliated Pine. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Animal and Plant Health Service. Plant Protection and Quarantine Programs; United States. Bureau of Entomology and Plant Quarantine; United States. Plant Pest Control Division. Hyattsville, MD. [etc. ] Plant Protection and Quarantine Programs Animal and Plant Health Service
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