Dyed kaolin to repel Asian citrus psyllid in field conditions

Dyed kaolin to repel Asian citrus psyllid in field conditions

Report Date: 04/21/2020
Project: 16-020C   Year: 2019
Category: Horticultural & Management
Author: Christopher Vincent
Sponsor: Citrus Research and Development Foundation

This project was undertaken to assess the impacts of red-dyed and undyed particle films to repel the Asian citrus psyllid (Diaphorina citri; ACP) in the field in Florida. Previous work has indicated that under controlled conditions white kaolin particle films reduced arrival of ACP on citrus plants. Additionally, the same test showed a significant further reduction when the kaolin particle film was dyed bright red. We set out to test these results over time under field conditions.  The overall conclusions of this project support the initial studies: white particle films reduce ACP and delay infection, and red-dyed film further reduces ACP and infection rate. Furthermore, these two products enhance growth, with the red-dyed film enhancing growth to a greater degree than the white film. They both increase canopy growth, trunk growth, and yield when compared to insecticide controls and to a treatment with no ACP control. This growth enhancement continued even after HLB infection. Infection reduced the plant growth rate, but the red-kaolin treated HLB-infected plants maintained a higher growth rate than infected untreated plants and a similar growth rate to HLB-free plants without particle films. Studies with potted plants indicate that red film enhances citrus growth relative, in some cases, to treatments with particle films of other colors. We followed up on these studies to assess how the red film produces this effect and concluded that it reduces water use, avoiding leaf water deficits. Overall, we can recommend both red and white particle films to enhance growth and repel ACP, delaying infection.


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