Entomologia Sinica (2002) 9, 1-9

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Tong-Xian Liu and Philip A. Stansly (2002)
Fuctional response and plant preference of Nephaspis oculatus (Coleoptera: Coccinellidae), preying on Bemisia argentifolii (Homoptera: Aleyrodidm) in the laboratory
Entomologia Sinica 9 (1), 1-9
Abstract: The predatory behavior and functional response of all larval stages and adults of Nephaspis oculatus (Blatchley), a predacious coccinellid, on various egg densities of Bemisia argentifolii Bellows and Pemng, and prey preference of adult N. oculatus, were studied in the laboratory. Daily consumption of eggs of B. argentifolii by N. oculatus was evaluated at six different densities to obtain functional response curves for all active stages of the coccinellid. Bemisia argentifolii eggs were offered to N. oculatus on collard leaf disks in Petri dish arenas over a 24-h period at 26.7 ± 2°C: and a photoperiod of 14:10 (L: D) h. Linear relationship were observed between percentage prey consumed and prey density, with r2 values between 0.82-0.99 for all stages except for the fourth instar that had a smaller r2 value (0.64). Functional response curves of prey consumption by N. oculatus against density of B. argentifolii eggs fitted the type II model of Holling's disc equation for all larval stages and both the male and female adults. Adult females consumed more prey than adult males. The maximum theoretical number of prey consumed per day increased with larval development. The fourth instar was the most effective larval predator, followed by the third instar, the second instar, and finally, the first instar. Based on the functional response parameters, a maximum of 321, 312, 237, 229, 73, and 34 B. argentifolii eggs could be attacked by an adult female, a fourth instar, an adult male, a third instar, a second instar, and a first instar of N. oculatus, respectively. Nephaspis oculatus adults strongly preferred collard to tomato, soybean, eggplant or sweet-potato for oviposition and foraging. Nephaspis oculatus did not deposit any eggs on soybean and tomato.
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Database assignments for author(s): Tong Xian Liu, Philip A. Stansly

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


Pest and/or beneficial records:

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


Bemisia tabaci biotype MEAM1
Nephaspis oculatus (predator) Bemisia tabaci biotype MEAM1