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1 December 2006 Spatial and Temporal Dynamics of Overwintering Homalodisca coagulata (Hemiptera: Cicadellidae)
Yong-lak Park, Thomas M. Perring, Rosie Yacoub, David W. Bartels, David Elms
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A 4-yr landscape-scale study was conducted to investigate spatial and temporal dynamics of overwintering Homalodisca coagulata (Say) (Hemiptera: Cicadellidae) in the lower San Joaquin Valley, California. Spatial structures of H. coagulata distributions were characterized with Moran’s I index, and spatial associations between H. coagulata and the surrounding environment were investigated with a geographic information system. H. coagulata was caught consistently with sticky traps throughout the winter, and trap catches formed a distinctive peak in December or January, indicating active flight of H. coagulata during the winter. In 2000–2001, the mean ± SE trap count was 4.8 ± 1.21 per trap per wk, and H. coagulata trap catches were spatially autocorrelated within ≈1.3 km. Approximately 49% of H. coagulata were caught in citrus, 23% in stone fruit, and 11% in grape. After a control program began in spring 2001, the mean trap count was considerably lower (0.041 ± 0.0004 per trap per wk), and no spatial autocorrelations were detected in 2001–2004. H. coagulata trap catch–crop associations also changed after initiation of the control program. Between 25 and 38% of H. coagulata trap catches were from citrus, between 8 and 20% were from stone fruit, and between 11 and 25% were from grape. Potential for winter-season spread and management of Xylella fastidiosa Wells et al., a pathogen causing Pierce’s disease, are discussed.

Yong-lak Park, Thomas M. Perring, Rosie Yacoub, David W. Bartels, and David Elms "Spatial and Temporal Dynamics of Overwintering Homalodisca coagulata (Hemiptera: Cicadellidae)," Journal of Economic Entomology 99(6), 1936-1942, (1 December 2006).
Received: 2 May 2006; Accepted: 1 June 2006; Published: 1 December 2006

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