. Circular. Insect pests; Insect pests. HOW TO CONTROL THE PEAR THRIPS. u Table VI.—Number of adult thrips emerging from cages containing samples of soil taken before and after ploioing—Landon prune orchard, 1908-9. Plowed and cross plowed. Before plowing. Cage I. Cage II. Cage III. Cage IV. Cage V. Cage VI. 475 389 007 115 1,175 1,474 Average number of thrips per cage before plowing 1, 364 Average number of thrips per cage after plowing and cross plowing 396 Percentage li-vnng in treated areas as against the number of thrips living in un- treated ground per 30 Approximate percentage ki
. Circular. Insect pests; Insect pests. HOW TO CONTROL THE PEAR THRIPS. u Table VI.—Number of adult thrips emerging from cages containing samples of soil taken before and after ploioing—Landon prune orchard, 1908-9. Plowed and cross plowed. Before plowing. Cage I. Cage II. Cage III. Cage IV. Cage V. Cage VI. 475 389 007 115 1,175 1,474 Average number of thrips per cage before plowing 1, 364 Average number of thrips per cage after plowing and cross plowing 396 Percentage li-vnng in treated areas as against the number of thrips living in un- treated ground per 30 Approximate percentage killed 70 In the spring of 1909, 5J acres of this 16-acre orchard were sprayed three times; twice before blooming, for adults, the first application March 8 and 9, just as cluster buds were spreading, and the second. Fig. G.—Power sprayer at work in Landon prune orchard, 1909. (Original.) application March 16 and 17, just as the white tips of the petals were beginning to show. The third application or larval treatment was put on April 11 and 12, after most of the petals had fallen. For all sprayings a gasoline-power outfit, with tower platform and three leads of hose, as shown in figure 6, was used, two men spraying from the ground and one from the tower to cover the tops of the trees. The material used was the recommended 3 per cent homemade distillate-. 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
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectinsectp, bookyear1904
