HLB remains one of the most significant threats to citrus production worldwide, spread primarily by the Asian citrus psyllid. Young trees are especially vulnerable during establishment, when infection can severely limit long-term productivity. The study evaluated how IPCs-physical barriers placed around individual trees-perform both as a disease-management tool and as an environmental modifier for developing trees.
Results show that IPCs effectively limited early contact between young trees and insect vectors, supporting their role in integrated HLB management strategies. However, the research also found that responses varied across citrus varieties, indicating that tree growth, canopy development, and overall performance under IPCs are not uniform. These differences suggest that selection of variety is an important consideration when adopting IPCs as a protective measure.
The findings highlight a dual role for IPCs: reducing disease risk while influencing microclimate conditions around the tree, such as temperature, humidity, and light interception. These changes can alter tree physiology in ways that may be beneficial for some varieties and neutral or less favorable for others. Understanding these interactions can help growers make more informed decisions about whether and how to deploy IPCs in new plantings.
The study provides practical insights for citrus producers seeking additional tools to protect young trees during the most vulnerable stages of growth. By demonstrating both the protective benefits and the variety-specific effects of IPCs, the research supports more targeted, site-specific management approaches in the ongoing effort to slow the impact of HLB.
Fernando Alferez is Associate Professor of Citrus Horticulture at the University of Florida, IFAS.
According to Dr. Alferez, "(R)esearch with IPCs has been a main line of work in his program since 2018. We started this work because there were anecdotal evidence and observations from some growers on the effectiveness of IPCs, but there was not systematic replicated research on this topic. So, I led a multidisciplinary team (comprising citrus horticulture, physiology, entomology, and pathology) to understand how this tool can benefit growers when growing young citrus trees in a scenario oh endemic HLB, as Florida is these days. Since the industry is also diversifying the varieties of citrus that they are planting, we thought that studying the effects on different varieties was important, and we found that not all varieties respond equally to the conditions that IPCs create. This is knowledge is important when planting new citrus trees because now we know that for some varieties IPCs will help the trees, but for other varieties there is no beneficial effect."
The full article can be read on the Journal of the American Society for Horticultural Science electronic journal website at: https://doi.org/10.21273/JASHS05519-25
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