{"pk":41394,"title":"Within-orchard edge effects of the azimuth of the sun on Diaphorina citri adults in mature orchards.","subtitle":null,"abstract":"Huanglongbing (HLB) is considered the most devastating disease of citrus. The bacterium and vector associated with HLB in Florida are \nCandidatus \nLiberibacter asiaticus and \nDiaphorina citri\n (Asian citrus psyllid), respectively. \nD. citri\n is positively phototropic, and higher populations have been found along edges of orchards exposed to the sun. A survey was designed to determine if \nD. citri\n adult populations along edges of orchards varied according to time-of-day and time-of-year in relation to the azimuth of the sun. The survey was conducted twice. Citrus orchards, each divided into 9 sampling areas, were surveyed for \nD. citri\n via stem-tap sampling. Orchards were sampled 3 times per day (near sunrise, solar noon, and sunset) and 4 times per year (near the summer solstice, autumnal equinox, winter solstice, and vernal equinox). Time-of-year and sampling area significantly affected psyllid counts (\nP\n = 0.0518 and 0.0630, respectively). \nD. citri \nadults were most prevalent during the summer solstice sampling period. No overall significant time-of-day effect was observed (\nP\n > 0.6). Localization of adult \nD. citri \nin sampled citrus orchards did not significantly change in relation to time-of-year (\nP\n = 0.0907). Linear mixed regression was used to fit a quadratic equation to log \nD. citri \nabundance data in relation to elevation-corrected azimuth at the time of sampling; the fitted model was significant and predicted log \nD. citri\n abundance to exhibit a concave-up pattern with increasing elevation-corrected azimuth. This relationship represented in a new form how population counts of \nD. citri \nadults in Florida were greatest during the summer.","language":"en","license":{"name":"Creative Commons Attribution 4.0","short_name":"CC BY 4.0","text":"Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.\n\nNo additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.","url":"https://creativecommons.org/licenses/by/4.0"},"keywords":[],"section":"Articles","is_remote":true,"remote_url":"https://escholarship.org/uc/item/14w3d91j","frozenauthors":[{"first_name":"D","middle_name":"J","last_name":"Anco","name_suffix":"","institution":"North Carolina State University, National Science Foundation Center for Integrated Pest Management, 1730 Varsity Drive, Suite 110, Raleigh, NC 27606, USA","department":"None"},{"first_name":"T","middle_name":"R","last_name":"Gottwald","name_suffix":"","institution":"Agricultural Research Service, US Department of Agriculture, US Horticultural Research Laboratory, 2001 South Rock Road, Fort Pierce, FL 34945, USA","department":"None"}],"date_submitted":"2015-08-28T18:21:36Z","date_accepted":"2015-08-28T18:21:36Z","date_published":"2015-08-31T19:38:15Z","render_galley":null,"galleys":[{"label":"","type":"pdf","path":"https://journalpub.escholarship.org/iocv_journalcitruspathology/article/41394/galley/30992/download/"}]}