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Improved residential citrus host mapping and its potential influence on Asian Citrus Psyllid (ACP) population
W. LUO (1), T. Gottwald (2), G. McCollum (3). (1) USDA ARS, Ft Pierce, FL, U.S.A.; (2) U.S. Horticultural Research Laboratory, USDA ARS, Fort Pierce, FL, U.S.A.; (3) USDA ARS, Fort Pierce, FL, U.S.A.

Linking residential citrus cultivar/species preference to distribution is a challenging new area of host density mapping and modeling. Dooryard citrus preferences are heterogeneous and far from random.  In addition to local climatic and environmental factors, we postulate that a range of demographic and socioeconomic factors can also affect the residential preferences for citrus types. Based on residential citrus huanglongbing (HLB) /ACP survey between 2013 and 2015, hundreds of thousands properties with dooryard citrus in seven counties of southern California was visited. Dooryard citrus tree distribution and associated ACP population counts were observed for each property. Principle component analysis was firstly used to characterize the variation of dooryard citrus distribution. Subsequently, we evaluated the relationship between demographic and socioeconomic factors and citrus tree preference using generalized linear model regression where statistically appropriate, and evaluated the fit of the relationship to determine the degree to which variable has significant association with preferences.  Lastly, we summarized the spatio-temporal pattern of ACP finds in each citrus host type, and quantified the effect of citrus host on ACP tolerance. Improved residential citrus host mapping is a necessary step towards a comprehensive understanding of the ACP spread in residential areas and its influence on HLB epidemics.

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