Location: Tropical Crops and Germplasm Research
Title: Coccinellid predators do not track populations of the Asian citrus phyllid (Diaphorina citri) in citrus in Puerto Rico Authors
Submitted to: Entomological Society of America Annual Meeting
Publication Type: Abstract Only
Publication Acceptance Date: June 4, 2013
Publication Date: N/A
Technical Abstract: Yellow sticky cards were used to survey populations of Diaphorina citri, the vector of Huanglongbing, the most devastating bacterial disease of citrus worldwide. The numbers of coccinellids, potential predators of Diaphorina citri, were also surveyed. Citrus surveyed included a variety of species (Valencia orange, mandarin, lemon), as well as ornamentals Murraya paniculata and Bergera koenigii. The study sites included a range of management models, from zero management to intensively managed orchards, and orchards were located at different elevations in Puerto Rico. Our results demonstrate that a variety of coccinellids are present at relatively high population densities on citrus. Although coccinellids are reported to be important predators of Diaphorina citri, populations of coccinellids were lowest on hosts with the highest populations of Diaphorina citri, i.e., Murraya paniculata and Bergera koenigii. Aphids were absent from these hosts, but were plentiful on flushing Citrus species. The presence of aphids probably draws coccinellid predators.