Frequency of processed kaolin application to prevent Diaphorina citri infestation and dispersal in flushing citrus orchards

Autor(es)

Miranda, Marcelo Pedreira ^[1] ; Eduardo, Wellington Ivo ^[1] ; Tomaseto, Arthur Fernando ^[1] ; Linhares Volpe, Haroldo Xavier ^[1] ; Bachmann, Luciano ^[2]

Afiliação do(s) autor(es)

^[1] Fund Citrus Protect Fundecitrus, Dept Res & Dev, Ave Dr Adhemar Pereira de Barros 201, BR-14807040 Araraquara, SP - Brazil

^[2] Univ Sao Paulo, Sch Philosophy Sci & Languages Ribeirao Preto, Ribeirao Preto - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Pest Management Science; v. 77, n. 12 AUG 2021.
• Citações Web of Science: 0

Resumo

BACKGROUND Processed kaolin is a promising tactic that can be utilized for managing Diaphorina citri Kuwayama infestation. 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 D. citri infestation and dispersal in flushing citrus orchards and to measure the spectral reflectance of kaolin-sprayed leaves. RESULTS Trees sprayed with kaolin at 7- and 14-day intervals showed an 80% psyllid reduction compared to untreated trees. In addition, there was lower psyllid dispersal in the kaolin-sprayed plots. Spectral measurements (wavelengths between 320 and 700 nm) 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-sprayed immature leaves compared to untreated trees. CONCLUSION Application of kaolin (2%) at 7- and 14-day intervals can be an important and sustainable tool for reducing D. citri infestation and dispersal in flushing citrus orchards. The reduced D. citri 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 D. citri host finding behavior. (AU)

• Processo FAPESP: 19/19649-3 - Eficiência do manejo cultural e físico na dispersão de Diaphorina citri e manejo do huanglongbing
• Beneficiário: Wellington Ivo Eduardo
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado