Journal of Food, Agriculture and Environment

Vol 11, Issue 2,2013
Online ISSN: 1459-0263
Print ISSN: 1459-0255

Positive density-dependent prey mortality of Bemisia tabaci puparia due to the predatory coccinellid Serangium parcesetosum Sicard 


Firas A. Al-Zyoud 1, Ihab H. Ghabeish 2*, Salah-Eddin A. Araj 3

Recieved Date: 2013-01-20, Accepted Date: 2013-04-30


The relationship between the consumption rate of the predator Serangium parcesetosum Sicard (Coleoptera: Coccinellidae) and the prey density of Bemisia tabaci (Genn.) (Homoptera: Aleyrodidae) was studied. Adult’s female predators of seven-day-old were singly used with different densities of whitefly puparia to determine their response pattern. Type of density dependent prey mortality due to S. parcesetosum was found to confirm its efficacy in regulating prey populations. The predator imposed positive density dependent type III functional response. The proportion of prey consumed increased to an inflection point of the sigmoid curve, followed by a decrease in the proportion of prey consumed. The predator functional response can be simulated by Holling’s disc equation and expressed as number of prey consumed, Ne = (0.82 N / 1 + 0.0016 N), where N represents number of prey offered and by the reciprocal linear transformation of Holling’s equation as y = 1.2218 x – 0.0019. The estimated search rate (a) is 5.74 cm and the handling time (Th) is 3 min. Results confirmed that S. parcesetosum can be used as a promising biological control agent against B. tabaci since it has a type III functional response and a positive density dependent to the prey. 


Bemisia tabaci, biological control, density dependent, functional response, predator-prey interaction, Serangium parcesetosum

Journal: Journal of Food, Agriculture and Environment
Year: 2013
Volume: 11
Issue: 2
Category: Agriculture
Pages: 417-420

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