Annals of the Entomological Society of America (2004) 97, 235-239

Jian Liu, Kongming Wu, Keith R. Hopper and Kuijun Zhao (2004)
Population dynamics of Aphis glycines (Homoptera: Aphididae) and its natural enemies in soybean in northern China
Annals of the Entomological Society of America 97 (2), 235-239
Abstract: A field survey of soybean aphid, Aphis glycines Matsumura, and its natural enemies was conducted during summer 2002 in Langfang, northern China (116.4° E, 39.3° N). Aphids colonized soybean when plants were still small in early July. After a lag of 2 wk, aphid density increased rapidly in late July, reaching a peak of 114 ± 46 aphids per five soybean plants on 1 August. The population declined to a plateau immediately after this peak and then declined again starting in mid-August, although a second small peak occurred in late August. The finite rate of increase varied from zero- to five-fold, and the aphid seemed to be limited by natural enemies. The main species of natural enemy were the aphid parasitoid Lysiphlebus sp., the aphid predators Propylea japonica (Thunberg), Scymnus (Neopullus) babai Sasaji, and Paragus tibialis (Fallén). In a field exclosure experiment, A. glycines density in small-mesh cages peaked three-fold higher than in large-mesh cages and 12-fold higher than on uncaged plants, indicating that natural enemies did indeed limit aphid density.
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Database assignments for author(s): Keith R. Hopper, Kong Ming Wu

Research topic(s) for pests/diseases/weeds:
population dynamics/ epidemiology
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
surveys/distribution/isolation
population dynamics/epizootiology

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Aphis glycines	Soybean (Glycine max)	China (NE)
Propylea japonica (predator)	Aphis glycines	Soybean (Glycine max)	China (NE)
Scymnus babai (predator)	Aphis glycines	Soybean (Glycine max)	China (NE)
Paragus tibialis (predator)	Aphis glycines	Soybean (Glycine max)	China (NE)