. Cooperative economic insect report. Beneficial insects; Insect pests. Psylla mali Adult and Fifth-instar Nymph Figures (except map) from Speyer, W. 1929. Der Apfelblattsauger Psylla mali Schmidberger. 127 pp., 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 Sta
. Cooperative economic insect report. Beneficial insects; Insect pests. Psylla mali Adult and Fifth-instar Nymph Figures (except map) from Speyer, W. 1929. Der Apfelblattsauger Psylla mali Schmidberger. 127 pp., 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
