Pre-introductory evaluation of a coccinellid predator, Cycloneda sanguinea, L. (Coleoptera: Coccinellidae) for biocontrol of cotton aphid, Aphis gossypii Glover (Aphididae: Hemiptera) in glasshouses
2000
Isikber, A.A. ((University of Kahramanmara, Kahramanmaras (Turquie). Faculty of Agriculture, Plant Protection Division)) | Copland, M.J.W.
The present study was initiated to evaluate the potential of the coccinellid species, Cyclonada sanguinea L., for the biocontrol of cotton aphid, Aphis gossypii Glover, in laboratory. The studies focused on the aspects of development time, survival, fecundity, life-table parameters, food consumption and functional response of C. sanguinea at various temperatures. The data for development, survival and fecundity indicated that the most favourable temperature for C. sanguinea was found to be in the range of 20 deg C to 25 deg C. The intrinsic rate of increase (rm) of C. sanguinea (0.16) was found to be optimum at 25 deg C. The highest fresh weight of aphids consumed by first, second, third and fourth larval instars and overall development of C. sanguinea was found to be at 25 deg C, 30 deg C, 25 deg C, 25 deg C and 25 deg C respectively. The fourth instar stage of the species was the most voracious, since about 81 percent - 85 percent of the total food consumption were consumed during fourth larval instars of C. sanguinea. Functional response experiments indicated that the female adults of C. sanguinea which take less time to process the cotton aphids and are efficient searchers, required high number of cotton aphids to reach satiation, especially at high temperatures. These characteristics suggest that C. sanguinea can be a possible candidate for biological control of cotton aphid in glasshouses
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