Persistence of Early-Season Treatments for Control of Colorado Potato Beetle, Leptinotarsa decemlineata (Say), Attacking Field Tomato

The relative persistence of early-season treatments for control of Colorado potato beetle, Leptinotarsa decemlineata (Say) attacking field tomato, Lycopersicon esculentum, in southwestern Ontario, Canada, was compared by laboratory bioassay of field-collected foliage. Both mortality and feeding dama...

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Bibliographic Details
Published in:Journal of vegetable crop production 2000-07, Vol.6 (1), p.3-16
Main Authors: Tolman, J. H., Chapman, R. A., Moy, P., Henning, K. V.
Format: Article
Language:English
Subjects:
Colorado potato beetle
control
imidacloprid
persistence
Tomato seedlings
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Summary:The relative persistence of early-season treatments for control of Colorado potato beetle, Leptinotarsa decemlineata (Say) attacking field tomato, Lycopersicon esculentum, in southwestern Ontario, Canada, was compared by laboratory bioassay of field-collected foliage. Both mortality and feeding damage by introduced adult Colorado potato beetle (CPB) were recorded after 72 hours. Four methods of insecticide application (pre-plant foliar [PRF]); post-plant foliar [POF]; pre-plant drench [PRD]; and, planting water [PW]) were compared with commercial control programs. At an arbitrary acceptable threshold for percent mortality/damage reduction of 70%, the order of effectiveness in 1996 was: imidacloprid-PW > imidacloprid-PRD > imidacloprid-POF = cypermethrin-POF, Imidacloprid-PRF did not provide acceptable control of adult CPB. No residues of imidacloprid were detected in ripe tomato fruit following any application or in soil after fall cultivation following PRD-application. Relevance of results to potential CPB-management programs for field tomato is discussed.
ISSN:1049-6467
DOI:10.1300/J068v06n01_02