Field Trials with Disparlure in Massachusetts to Suppress Mating of the Gypsy Moth 12
| Autor: | E. F. Knipling, W. Klassen, Morton Beroza, Douglas Trefrey, C. S. Hood, David E. Leonard |
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| Rok vydání: | 1975 |
| Předmět: | |
| Zdroj: | Environmental Entomology. 4:705-711 |
| ISSN: | 1938-2936 0046-225X |
| DOI: | 10.1093/ee/4.5.705 |
| Popis: | Use of disparlure to disrupt mating of low-density populations of gypsy moths, Porthetria dispar (L.), was tested in central Massachusetts in 1974. In one area with a naturally low population, disparlure in slow-release microencapsulated form was applied to 2.6-km2 plots at the following rates: 5 g lure/ha, 2 consecutive treatments each at 10 g lure/ha 2½ wk apart, and 20 g lure/ha; a 4th plot served as an untreated control. Results obtained by treatment with 5 g lure/ha were considered inadequate, mating success of exposed females was reduced 47% compared with the control; male captures in monitor traps and post-treatment egg-mass counts also indicated ca. 50% control. Treatments with the higher dosages were more successful: mating success of exposed females was reduced 94–97%, and male captures and post-treatment egg-mass counts were also markedly suppressed. In a 2nd area, 2 treatments with insecticide were applied to a 6-km2 island in the Quabbin Reservoir to reduce its potentially high gypsy moth population to a low level. One-third of the island received no further treatment, ⅓ was treated once with 20 g lure/ha as microcapsules, and ⅓ was treated by mass trapping with 25 high potency disparlure-baited traps/ha. The 3 treatments all showed the same degree of mating by exposed females, 2.4–3.2% relative to mating on an untreated (control) island, on which mating was 85.4%, despite a low initial population. Captures in monitor traps totalled 14 in the area treated only with insecticide compared with 5 each in the other 2 areas and 467 in the untreated control. Although egg-mass counts were low in all areas, none were found in the area treated with both insecticide and microencapsulated disparlure. In both areas, high potency monitor traps showed promise as a means of measuring effectiveness of treatment within disparlure-treated areas. The 1974 results strongly indicate that the air-permeation technique employing slowrelease encapsulated disparlure at the rate of 20 g lure/ha is effective in reducing mating success in low-level infestations or in infestations reduced to a low level with an insecticide. |
| Databáze: | OpenAIRE |
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