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Journal of Entomology
  Year: 2013 | Volume: 10 | Issue: 2 | Page No.: 76-85
DOI: 10.3923/je.2013.76.85
Functional Responses of Cheilomenes propingua, C. lunata and C. sulphurea (Coleoptera: Coccinellidae) to Predation on Aphis gossypii (Homoptera: Aphididae) in Eastern Tanzania
F. Mrosso, M. Mwatawala and G. Rwegasira

Abstract:
Functional response is one of factors to know before considering use of predators in biocontrol programme. A study to determine type of functional responses of Cheilomenes propingua, Cheilomenes lunata and Cheilomenes sulphurea (predators) at different Aphis gossypii (prey) densities (i.e., 25, 50, 100, 200, 300, 400 and 500) were investigated in the laboratory using petri-dishes in ten replicates. Mean number of prey consumed were plotted against the initial density supplied which showed Type II Functional response to all three predators. The result was confirmed by using logistic regression model which showed negative linear parameter. The linear reciprocal transformation of the Holling’s disc equation was used to determine handling time (‘Th’) and search rate (‘a’). The handling times 0.171, 0.196, 0.240 h for the females C. lunata, C. sulphurea and C. propingua, respectively were obtained of which were generally lower than that of the male coccinellids 0.217, 0.220 and 0.270 h. Female search rates were estimated as 1,258, 1.277 and 1.404 and males 1.312, 1.360, 1.489 for C. lunata, C. sulphurea and C. propingua, respectively. The above results indicate higher predation aggressiveness of females as compared to the males. Handling times for C. lunata and C. sulphurea females and males were lowest when compared to C. propingua suggesting to be more efficient in aphid consumption than C. propingua. It is concluded that the three coccinellid predators have type II Functional response and also C. lunata and C. sulphurea have a greater potential of eating aphids than C. propingua. Field studies are required to explore their potential under natural conditions.
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How to cite this article:

F. Mrosso, M. Mwatawala and G. Rwegasira, 2013. Functional Responses of Cheilomenes propingua, C. lunata and C. sulphurea (Coleoptera: Coccinellidae) to Predation on Aphis gossypii (Homoptera: Aphididae) in Eastern Tanzania. Journal of Entomology, 10: 76-85.

DOI: 10.3923/je.2013.76.85

URL: https://scialert.net/abstract/?doi=je.2013.76.85

 
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