Biological control ofAphis pomi [Hom.: Aphididae] ofAphidoletes aphidimyza [Dip.: Cecidomyiidae]; a predator-prey model |
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| Authors: | J G Morse B A Croft |
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| Institution: | (1) Department of Entomology, Michigan State University, 48824 E. Lansing, MI, USA;(2) Present address: Department of Entomology, University of California, 92521 Riverside, CA, USA;(3) Present address: Department of Entomology, Oregon State University, 97331 Corvallis, OR, USA |
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| Abstract: | Predation ofAphis pomi DeGeer Hom.: Aphididae] byAphidoletes aphidimyza (Rondani) Dipt.: Cecidomyiidae] was simulated in Michigan apple orchards using a computer and output validated against field data collected from sleeve
cages enclosing aphid infested apple terminals. Lower and upper temperature thresholds for development were 2.9 and 35°C for
nymphs ofA. pomi with a mean immature developmental period of 162.3 heat units. Median survivorship of adultA. pomi was 364.3 heat units with an average fecundity of 60.7 offspring per female.A. aphidimyza egg and larval lower threshold and developmental periods were 10.5 and 25.5, 8.1°C and 65.5 heat units, respectively. Larval
functional response showed Type II behavior with a y-asymptote of 45 aphids killed per predator. Multiple generation model
runs performed under different initial predator: prey densities indicated that current critical predator: prey ratios used
in the field for control decisions may underestimate predator efficacy.
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| Keywords: | Aphidoletes aphidimyza Aphis pomi Biological control predatoryprey model |
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