. Circular. Insect pests; Insect pests. Fig. 3.—The pear thrips: Eggs, high- ly magnified. (Original.) By the time the fruit buds have swollen sufficiently to separate the bud scales slightly at the tip the adults force their way within, feeding upon the tenderest portions inside the buds. When the thrips are present in sufficient numbers the buds are completely destro3'^ed and the trees fail entirely to bloom. Eggs.—As soon as the first leaf surfaces or fruit stems are exposed egg laying usually begins, depending somewhat on the variety of fruit attacked. The first eggs are deposited the last
. Circular. Insect pests; Insect pests. Fig. 3.—The pear thrips: Eggs, high- ly magnified. (Original.) By the time the fruit buds have swollen sufficiently to separate the bud scales slightly at the tip the adults force their way within, feeding upon the tenderest portions inside the buds. When the thrips are present in sufficient numbers the buds are completely destro3'^ed and the trees fail entirely to bloom. Eggs.—As soon as the first leaf surfaces or fruit stems are exposed egg laying usually begins, depending somewhat on the variety of fruit attacked. The first eggs are deposited the last days of February and oviposition continues till near the middle of April, being at its maximum, however, from the 10th of March to the 1st of April. Most of the eggs (fig. 3) are deposited just under the epidermis in the fruit stems, young fruit, and leaf stems. The eggs require from five to seven- teen days to hatch, the average time being about eight days. Larvx.—By the time the trees are break- ing into full bloom the adults have done most of the damage caused by their feeding, and oviposition is at its height. Many of the earlier appearing adults are dying off and larvae (fig. 4) are beginning to appear in pear thrips: Larva, numbcrs. The vcry first larvse can usually be found about March 20, and are in maxi- mum numbers on the trees, feeding on the small fruit and young foliage, from the first to middle of April. Reaching their full devel- opment, the larvae drop from the trees, of their accord or with falling calyces, or are blown by wind or knocked off by rain. After the Fig greatly enlarged. 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, D. C. : The Bureau
Size: 1669px × 1496px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectinsectp, bookyear1904
