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|Title:||Influence of temperature on the reproductive and demographic parameters of two spider mite pests of vineyards and their natural predator||Authors:||Stavrinides, Menelaos C.
Mills, Nicholas J.
|Keywords:||life table parameters;metaseiulus-occidentalis acari;tetranychus-urticae;phytoseiulus-persimilis;neoseiulus-californicus;biological-control;willamette mites;pacific mites;water-stress||Category:||Entomology||Issue Date:||Jun-2011||Publisher:||SPRINGER||Source:||BIOCONTROL Volume: 56 Issue:3 Pages:315-325||Abstract:||We evaluated the influence of temperature on demographic parameters of two common vineyard pests, the Pacific spider mite, Tetranychus pacificus McGregor, and the Willamette spider mite, Eotetranychus willamettei (McGregor) (Acari: Tetranychidae). Additionally, we investigated the effects of temperature on their shared predator, the western predatory mite, Galendromus occidentalis (Nesbitt) (Acari: Phytoseiidae). The intrinsic rate of increase (r (m) ) was higher for T. pacificus than E. willamettei at 15 and 28A degrees C, but similar at 22A degrees C. G. occidentalis achieved a higher r (m) than T. pacificus from 15 to 28A degrees C, but the difference was significant only at 22A degrees C. At 34A degrees C, the r (m) for both T. pacificus and G. occidentalis was negative, while E. willamettei did not develop at this temperature. Prey species did not affect demographic parameters of G. occidentalis. These results suggest that higher temperatures favor T. pacificus over the less damaging E. willamettei, and may also reduce the effectiveness of G. occidentalis.||Description:||This research was supported by scholarships to MC Stavrinides from the Robert and Peggy van den Bosch Memorial Scholarship in Biological Control and the Cyprus-America Scholarship program administered by the Fulbright Commission in Cyprus. Funding was also provided by the American Vineyard Foundation, the Viticulture Consortium West and the California Raisin Marketing Board. We thank A. Goldman, J. King, R. Lara and the undergraduate research apprentices who helped with laboratory observations. Steve Welter and Wayne Sousa read earlier versions of this manuscript and provided comments for its improvement. We also thank Duarte nurseries for supplying grape plants for this study.||URI:||http://ktisis.cut.ac.cy/handle/10488/3608
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