Environmental Entomology (2010) 39, 2006-2016

V.M. Walton, A.J. Dreves, L.B. Coop, G.V. Jones and P.A. Skinkis (2010)
Developmental parameters and seasonal phenology of Calepitrimerus vitis (Acari: Eriophyidae) in wine grapes of western Oregon
Environmental Entomology 39 (6), 2006-2016
Abstract: Developmental parameters of protogyne Calepitrimerus vitis (Nalepa) (Acari: Eriophyidae) were determined at 12, 15, 17, 22, 25, 28, 31, and 34°C to better understand seasonal activity, population growth, and ultimately more effectively manage pest mites in wine grapes. Net reproductive rate (Ro) was greater than zero at all temperatures with the maximum Ro (9.72) at 25°C. The lowest estimated Ro (0.001) occurred at 34°C. There was a gradual decrease in mean generation time (T) as temperatures increased from 17 to 31°C. The shortest and longest generation time was recorded at 31°C (T = 5.5 d) and 17°C (T = 17.5 d). Rates of natural increase were lowest at 17°C (0.035) and increased with increasing temperatures, respectively. The peak rate of natural increase value (0.141) was at 25°C. Estimations for minimum and maximum developmental thresholds were 10.51 and 39.19°C, respectively, while the optimum developmental temperature was 26.9°C. The thermal constant for egg to adult development was estimated at 87.7DD. The highest fecundity was observed at 25°C. These parameters indicated that mites begin feeding at the onset of shoot growth when tissue is most susceptible in spring. Historical weather data showed that vines are in this susceptible growth stage for longer periods in the cool Willamette Valley compared with warmer Umpqua and Applegate/ Rogue Valley regions. Estimation of degree-days indicated when deutogyne mites move to overwintering refuge sites. Degree-day accumulations indicated up to 14 generations per growing season.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Vaughn Martin Walton

Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution
population dynamics/ epidemiology

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Calepitrimerus vitis	Grapevine (Vitis)	U.S.A. (NW)