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A comparative study on the intrinsic rates of increase of cyrtobagous singularis and cyrtobagous salviniae on the water weed salvinia molesta



A comparative study on the intrinsic rates of increase of cyrtobagous singularis and cyrtobagous salviniae on the water weed salvinia molesta



Entomologia Experimentalis et Applicata 42(3): 231-238



The intrinsic rates of increase (rm) of Cyrtobagous salviniae Calder and Sands from Brazil and C. singularis Hustache from Trinidad W.I., were determined in the laboratory at 23.degree. C, 27.degree. C and 31.degree. C on nitrogen-rich plants of the aquatic weed, Salvinia molesta Mitchell. Variation in oviposition and immature survivorship accounted for most of the differences between species in rm values (exponential growth of a stable-age population in a non-limiting environment). Values for rm were higher for C. salvinae (0.210, 0.366, 0.404) than for C. singularis (0.148, 0.140, 0.064) at the three temperatures respectively. At all temperatures, C. salviniae laid seven times more eggs than C. singularis while at 31.degree. C oviposition was reduced for both species by 45%, and was accompanied by a reduction in egg hatch. Oviposition by C. salviniae was almost continuous (92% of weeks with some eggs laid) whereas oviposition by C. singularis was intermittent (50% of weeks) with intervals averaging 2 weeks without oviposition. Nitrogen concentration in S. molesta affected reproduction by C. singularis more than C. salviniae, an increase of 0.1% (dry wt) increasing weekly oviposition by 7.0% and 3.6% respectively. The differences in rm for the two weevil species are discussed in relationship to their potential as biological control agents.

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