BioControl (2014) 59, 739-748

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Elaine J. Fok, Jessica D. Petersen and Brian A. Nault (2014)
Relationships between insect predator populations and their prey, Thrips tabaci, in onion fields grown in large-scale and small-scale cropping systems
BioControl 59 (6), 739-748
Abstract: Onion thrips, Thrips tabaci Lindeman, is the primary pest of onion, which is grown in either large-scale, monoculture systems surrounded by other onion fields, or in small-scale systems surrounded by multiple vegetable crops. In 2011 and 2012, populations of insect predators and their prey, T. tabaci, were assessed weekly in onion fields in both cropping systems. Insect predator taxa (eight species representing five families) were similar in onions grown in both systems and the most commonly occurring predators were from the family Aeolothripidae. Seasonal population dynamics of predators and T. tabaci followed similar trends within both cropping systems and tended to peak in late July and early August. Predator abundance was low in both systems, but predator abundance was nearly 2.5 to 13 times greater in onion fields in the small-scale system. T. tabaci abundance often positively predicted predator abundance in both cropping systems.
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Database assignments for author(s): Brian A. Nault

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Thrips tabaci Onion/garlic/leek (Allium) U.S.A. (NE)
Coleomegilla maculata (predator) Thrips tabaci Onion/garlic/leek (Allium) U.S.A. (NE)
Hippodamia variegata (predator) Thrips tabaci Onion/garlic/leek (Allium) U.S.A. (NE)
Orius insidiosus (predator) Thrips tabaci Onion/garlic/leek (Allium) U.S.A. (NE)
Aeolothrips fasciatus (predator) Thrips tabaci Onion/garlic/leek (Allium) U.S.A. (NE)
Aeolothrips albicinctus (predator) Thrips tabaci Onion/garlic/leek (Allium) U.S.A. (NE)
Toxomerus marginatus (predator) Thrips tabaci Onion/garlic/leek (Allium) U.S.A. (NE)
Sphaerophoria pyrrhina (predator) Thrips tabaci Onion/garlic/leek (Allium) U.S.A. (NE)