. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. Fig. 1.—Wheat Field Totally Destroyed by the Spring Grain-Aphis (Toxoptera graminum). Contrast with uninjured portion of field shown in figure 2. (Original.). Fig. 2.—Circular Spot in Wheat Field where Growing Grain has been Destroyed by the Spring Grain-Aphis. The growing grain on these circular areas is as completely destroyed as in the field shown in figure 1. Increasing in size and number, the spots come to include whole fields. (Original.). Please note that these images are extracted from scanned page images
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. Fig. 1.—Wheat Field Totally Destroyed by the Spring Grain-Aphis (Toxoptera graminum). Contrast with uninjured portion of field shown in figure 2. (Original.). Fig. 2.—Circular Spot in Wheat Field where Growing Grain has been Destroyed by the Spring Grain-Aphis. The growing grain on these circular areas is as completely destroyed as in the field shown in figure 1. Increasing in size and number, the spots come to include whole fields. (Original.). 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. Bureau of Entomology. Washington : G. P. O.
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Keywords: ., bookcentury1900, bookdecade1900, booksubje, booksubjectentomology
