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However, the frequency of kaolin application to protect citrus trees during flushing remains undetermined. The objective of this study was to ascertain the frequency of kaolin application (2%) required to reduce <jats:italic>D. citri<\/jats:italic> infestation and dispersal in flushing citrus orchards and to measure the spectral reflectance of kaolin\u2010sprayed leaves.<\/jats:p><\/jats:sec><jats:sec><jats:title>RESULTS<\/jats:title><jats:p>Trees sprayed with kaolin at 7\u2010 and 14\u2010day intervals showed an 80% psyllid reduction compared to untreated trees. In addition, there was lower psyllid dispersal in the kaolin\u2010sprayed plots. Spectral measurements (wavelengths between 320 and 700\u2009nm) showed an increased reflectance of 35.4% (adaxial leaf side) and 21.9% (abaxial leaf side) in mature leaves, and 9% (adaxial leaf side) and 2.2% (abaxial leaf side) in kaolin\u2010sprayed immature leaves compared to untreated trees.<\/jats:p><\/jats:sec><jats:sec><jats:title>CONCLUSION<\/jats:title><jats:p>Application of kaolin (2%) at 7\u2010 and 14\u2010day intervals can be an important and sustainable tool for reducing <jats:italic>D. citri<\/jats:italic> infestation and dispersal in flushing citrus orchards. The reduced <jats:italic>D. citri<\/jats:italic> population in plots with both kaolin application intervals may be related to the visual effect (whitish aspect) and increased light reflectance in citrus trees, which are probably the main mechanisms by which kaolin interferes on <jats:italic>D. citri<\/jats:italic> host finding behavior. \u00a9 2021 Society of Chemical Industry.<\/jats:p><\/jats:sec>","DOI":"10.1002\/ps.6579","type":"journal-article","created":{"date-parts":[[2021,7,27]],"date-time":"2021-07-27T08:29:29Z","timestamp":1627374569000},"page":"5396-5406","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":23,"title":["Frequency of processed kaolin application to prevent <scp><i>Diaphorina citri<\/i><\/scp> infestation and dispersal in flushing citrus orchards"],"prefix":"10.1002","volume":"77","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1782-448X","authenticated-orcid":false,"given":"Marcelo 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