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Web URL(s): | http://journals.cambridge.org/download.php?file=%2FTCE%2FTCE108_11%2FS0008347X00038177a.pdf Last checked: 09/29/2015 Requires: PDF Reader Access conditions: Item is within a limited-access website |
Author(s): | Smirnoff, W. A.;
McNeil, J. N.;
Valero, J. R. |
Author Affiliation: | Centre de Recherches Forestieres des Laurentides, Service Canadien des Forets, Sainte-Foy, Quebec, Canada |
Title: | Experiments on the control of the European skipper, Thymelicus lineola (Lepidoptera: Hesperiidae) by aerial application of a nuclear polyhedrosis virus |
Source: | Canadian Entomologist. Vol. 108, No. 11, 1976, p. 1221-1222. |
Related Web URL: | http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=8552472&fulltextType=RA&fileId=S0008347X00038177 Last checked: 09/29/2015 Notes: Abstract only |
Keywords: | TIC Keywords: Thymelicus lineola; Pathogenicity; Phleum pratense; Arthropoda; Biological control; Hesperiidae
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Geographic Terms: | Canada |
Abstract/Contents: | In laboratory tests of the infectivity of a nuclear polyhedrosis virus that occurred naturally in Thymelicus lineola (Ochs.) in Quebec in 1974, second- and fourth-instar larvae, reared individually on timothy (Phleum pratense) and treated with aqueous suspensions of the polyhedra at various concentrations, ceased feeding and changed from green to yellow in color 3-4 days later; 50 and, in brackets, 100% mortality occurred 7-12 (21-33) and 3-6 (12-15) days after treatment, respectively. The adipose tissue was first affected and at death most tissues were heavily infected. Larvae treated in the late fifth instar with an aqueous suspension of polyhedra at 5 X 104/ml developed normally, but the adults to which they gave rise were heavily infected. Some larvae reared from eggs collected from the naturally infected population and surface sterilised were infected with the virus. In a field test in which timothy heavily infested with larvae in the late third or early fourth instars was sprayed from the air with an aqueous suspension containing 5 X 106/ml polyhedra (and an adhesive) at an application rate of 18.7 l/ha, symptoms of viral infection appeared after 7 days and 50, 80 and 100% mortality occurred 15, 19 and 27 days, respectively, after treatment. Mortality in the untreated control area did not exceed 15%. Before treatment, there was 20% defoliation in both the experimental and control areas, but whereas at the end of the season defoliation reached only 50% in the sprayed area, in the untreated control area it was complete. For more effective control, treatment should be made when the larvae are in the second or early third instar. |
Language: | English |
References: | 2 |
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete): Smirnoff, W. A., J. N. McNeil, and J. R. Valero. 1976. Experiments on the control of the European skipper, Thymelicus lineola (Lepidoptera: Hesperiidae) by aerial application of a nuclear polyhedrosis virus. Can. Entomol. 108(11):p. 1221-1222. |
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| Web URL(s): http://journals.cambridge.org/download.php?file=%2FTCE%2FTCE108_11%2FS0008347X00038177a.pdf Last checked: 09/29/2015 Requires: PDF Reader Access conditions: Item is within a limited-access website |
| MSU catalog number: QL 461 .C35 |
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