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Type: Article
Published: 2011-12-20
Page range: 118–123
Abstract views: 175
PDF downloaded: 154

Mine-damaged leaves by Phyllocnistis citrella Stainton provide refuge for phytoseiids on grapefruit in Florida and Texas*

Texas AgriLife Extension and Texas A&M University, 2401 East Highway 83, Weslaco, TX, 78596
University Of Florida, Citrus Research and Education Center, 700 Experiment Station Rd., Lake Alfred, FL 33850.
Citrus leafminer mite-refuge Phyllocnistis citrella phytoseiid


Damages caused by pests to leaves can indirectly affect populations of other associated arthropods. The relative abundance of mites was compared across young healthy leaves, mature healthy leaves and mature leaves damaged by the citrus leafminer, Phyllocnistis citrella Stainton, on grapefruit in Florida and Texas. The spider mite Eotetranychus sexmaculatus (Riley) (Tetranychidae) was significantly more abundant on mined leaves in Florida, whereas in Texas tetranychids were found sporadically. Predaceous phytoseiid mites (Phytoseiidae) were significantly more abundant on mature mined leaves than on mature leaves without mines. Iphiseiodes quadripilis (Banks) (n= 139), Typhlodromalus peregrinus (Muma) (n= 122) and Euseius mesembrinus (Dean) (n= 18) were the most abundant phytoseiids in Florida; E. mesembrinus was the dominant species in Texas [>90% of identified specimens (n=13)]. Although relatively high numbers of predaceous stigmaeid mites (Stigmaeidae) were found in some occasions in Florida, they had a patchy distribution, resulting in no significant differences between mined and unmined leaf types in most sampling dates. They were not found in Texas.