Journal of Economic Entomology (2006) 99, 1936-1942

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Yong-Lak Park, Thomas M. Perring, Rosie Yacoub, David W. Bartels and David Elms (2006)
Spatial and temporal dynamics of overwintering Homalodisca coagulata (Hemiptera: Cicadellidae)
Journal of Economic Entomology 99 (6), 1936-1942
Abstract: 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.
(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): Yong-Lak Park, Thomas M. Perring

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

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Homalodisca vitripennis Citrus (genus) U.S.A. (SW)
Homalodisca vitripennis Grapevine (Vitis) U.S.A. (SW)