. Cooperative economic insect report. Beneficial insects; Insect pests. - 785 - INSECTS NOT KNOWN TO OCCUR IN THE UNITED STATES PINE LAPPET (Dendrolimus pini L.) Economic Importance: Outbreaks of this moth occur periodically in Europe causing severe defoliation to pine, its primary host. Serious buildups take place about every six years in Poland. The outbreak of 1938 on Lussin Island in the northern Adriatic caused complete defoliation of 60,000 trees. Damage was also severe at this time in Elbe Valley in Bohemia, Germany. Many thousand acres were treated in Germany in 1948, 1949 and 1950 for
. Cooperative economic insect report. Beneficial insects; Insect pests. - 785 - INSECTS NOT KNOWN TO OCCUR IN THE UNITED STATES PINE LAPPET (Dendrolimus pini L.) Economic Importance: Outbreaks of this moth occur periodically in Europe causing severe defoliation to pine, its primary host. Serious buildups take place about every six years in Poland. The outbreak of 1938 on Lussin Island in the northern Adriatic caused complete defoliation of 60,000 trees. Damage was also severe at this time in Elbe Valley in Bohemia, Germany. Many thousand acres were treated in Germany in 1948, 1949 and 1950 for control of this pest. In heavy infestations complete destruction of foliage may occur within a period of a few days. Successive defoliations or defoliations followed by drought often cause death of the 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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Keywords: ., bookcentury1900, booksubjectbeneficialinsects, booksubjectinsect
