. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. LIFE HISTORY AND CONTROL OF HOP FLEA-BEETLE. 39 â were brought into the laboratory died within a week. Another lot, brought in May 11 and placed in a lamp chimney, lived well into July, the last individual surviving until August 22. This was an exceptional case, the average length of life being between three and six weeks. HABITS. THE LARVA. Where found.âMost of the larva? were observed to be within 18 inches of the base of the vine, the number increasing as the vine was approached. A however, were taken be
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. LIFE HISTORY AND CONTROL OF HOP FLEA-BEETLE. 39 â were brought into the laboratory died within a week. Another lot, brought in May 11 and placed in a lamp chimney, lived well into July, the last individual surviving until August 22. This was an exceptional case, the average length of life being between three and six weeks. HABITS. THE LARVA. Where found.âMost of the larva? were observed to be within 18 inches of the base of the vine, the number increasing as the vine was approached. A however, were taken between the rows, among the roots of chickweed and lambs- quarters, and even in well cultivated parts where no weeds were growing. The surface soil of the hop3'ards is filled with delicate rootlets (fig. 12) and the larvae find sufficient food almost anywhere. Depth in soil.âIn order to determine the average depth at which the younger stages may be found, the earth was taken up around the base of a vine in 3-inch layers, and the larvae in each layer counted. The results are as follows: No. of larvae Depth ot soil. found. 1-3 inches 6 3-6 inches 21 6-9 inches 7 9-12 inches 1 Although some few may be found above and some below, from 2 to 7 inches is the depth at which one may expect to find the majority of the larvae. Conditions far or aide.âThe soil in which the larvae were found varied from a light sandy loam to a very heavy, almost adobe condi- tion. 66513°âBull. 82â12 1 Fig. 12.âFilameutoiis roots of hop vini hop flea-beetle larvae feed. (Ori on which the ;iual.). 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.
Size: 1494px × 1672px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubje, booksubjectentomology
