Phenological and geographical relationships between catches of pea moth in sex-attractant traps |
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| Authors: | J N PERRY E D M MACAULAY B J EMMETT |
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| Institution: | Department of Statistics, Rothamsted Experimental Station, Harpenden, Herts. AL5 2JQ;Departments of Entomology, Rothamsted Experimental Station, Harpenden, Herts. AL5 2JQ;A.D.A.S., Block C, Government Buildings, Brooklands Avenue, Cambridge CB2 2DR |
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| Abstract: | Traps containing a sex attractant of the pea moth (Cydia nigricana) were used to monitor numbers of male moths in individual fields in south-eastern and eastern England from 1976 to 1978 at 16 or more sites/yr. Data concerning catches at different sites on several occasions over the flight season, and dates on which a ‘threshold catch’ was achieved were examined, and were related weakly to site locations within areas. Area spray warnings, based on trap catches at a few sites within a large area, provide a less reliable indication of the need to spray than on-site monitoring (two traps) in each pea field. On-site monitoring may be improved by specialist interpretation of trap catches. |
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