Predator-Prey Relationships on Apiaceae at an Organic Farm

Paul D. Shirk, Jeffrey P. Shapiro, Stuart R. Reitz, Jean M. G. Thomas, Rosalie L. Koenig, Mirian M. Hay-Roe, Lyle J. Buss
2012 Environmental Entomology  
Orius insidiosus (Say) and O. pumilio (Champion) were conÞrmed to be sympatric in north central Florida as the major predators of the Florida ßower thrips, Frankliniella bispinosa (Morgan), on ßowers of Queen AnneÕs lace, Daucus carota L. and false Queen AnneÕs lace, Ammi majus L. F. bispinosa was the predominant thrips observed on both ßowers but colonized D. carota to a greater extent and earlier in the season than A. majus. Despite differences in the abundance of F. bispinosa on the two
more » ... osa on the two plants, neither Orius species showed host plant afÞnities. Population proÞles for the thrips and Orius spp. followed a density dependent response of prey to predator with a large initial prey population followed by a rapid decline as the predator populations increased. The temporal increases in Orius spp. populations during the ßowering season suggest that they were based on reproductive activity. As observed in a previous study, O. insidiosus had a larger population than O. pumilio and also had a predominantly male population on the ßowers. By examining carcasses of the prey, there appeared to be no sexual preference of the thrips as prey by the Orius spp. as the prey pattern followed the demographics of the thrips sex ratio. Few immatures of either thrips or Orius spp. were observed on D. carota or A. majus, which suggests that oviposition and nymphal development occurred elsewhere. Based on these Þndings, D. carota and A. majus could serve as a banker plant system for Orius spp.
doi:10.1603/en11232 pmid:22732606 fatcat:wcvbg4y7arfmfhccwx7kisnbqu