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Environ Entomol

Title:		Local Depletion of Click Beetle Populations by Pheromone Traps Is Weather and Species Dependent
Author(s):		van Herk WG; Vernon RS;
Address:		"Agassiz Research and Development Centre, Agriculture and Agri-Food Canada, Agassiz, British Columbia, Canada. Sentinel IPM Consulting, Estate Dr, Chilliwack, British Columbia, Canada"
Journal Title:		Environ Entomol
Year:		2020
Volume:		49
Issue:		2
Page Number:		449 - 460
DOI:		10.1093/ee/nvaa006
ISSN/ISBN:		1938-2936 (Electronic) 0046-225X (Linking)
Abstract:		"Several Agriotes click beetle species are important pests of vegetables and field crops. Monitoring for beetles is generally done with pheromone-baited traps maintained in permanent locations. Since dispersal is mostly by walking, such traps may deplete populations around them, leading to underestimations of populations relative to nontrapped areas, and of concomitant risk of wireworm damage to nearby crops. We placed sets of five pitfall traps in field headland areas in 2015-2017, of which two were baited with Agriotes obscurus (L) or Agriotes lineatus (L) (Coleoptera: Elateridae) pheromone. Of these, one was maintained in a permanent location, while the other moved among the remaining positions. Traps were checked weekly over the emergence period. For A. obscurus, fixed and moving traps initially collected similar numbers, but the latter collected significantly more later in the season, indicating depletion around fixed traps. Depletion was most pronounced after a period of cold weather, and around the peak swarming period. Depletion observed for A. lineatus was not statistically significant. This indicates pheromone-baited traps used for walking insects can underestimate populations, but depletion rates vary with species and temperature and should be accounted for when traps are used to develop action thresholds or time control strategies"
Keywords:		Animals *Coleoptera Insect Control Pheromones Seasons Temperature Agriotes lineatus Agriotes obscurus action threshold depletion wireworm;
Notes:		"Medlinevan Herk, Willem G Vernon, Robert S eng England 2020/02/01 Environ Entomol. 2020 Apr 14; 49(2):449-460. doi: 10.1093/ee/nvaa006"