Eur. J. Entomol. 104 (3): 407-415, 2007 | DOI: 10.14411/eje.2007.060

Life table parameters of the pseudococcid predators Nephus includens and Nephus bisignatus (Coleoptera: Coccinelidae)

Dimitris C. KONTODIMAS1, Panagiotis G. MILONAS*,1, George J. STATHAS2, Leonidas P. ECONOMOU3, Nickolas G. KAVALLIERATOS1
1 Benaki Phytopathological Institute, Department of Entomology, St. Delta 8, 145 61, Kifissia, Greece,
2 Technological Educational Institute of Kalamata, 24 100, Antikalamos, Greece
3 Agricultural University of Athens, 75 Iera Odos str., 118 55, Votanikos, Athens, Greece

The fecundity of the pseudococcid predators Nephus includens (Boheman) and N. bisignatus (Kirsch) (Coleoptera: Coccinellidae), fed on Planococcus citri Risso (Hemiptera: Pseudococcidae), was studied at several constant temperatures (15, 20, 25, 30, 32.5 and 35°C). With additional data for the development of the immature stages, life-fecundity tables were constructed and some population parameters calculated. The average total fecundities of N. includens at the above temperatures were 49.2, 97.8, 162.8, 108.5, 87.4 and 31.1 eggs/female, and average longevities 99.5, 84.7, 69.5, 61.1, 49.6 and 30.1 days, respectively. The net reproductive rates (Ro) were 8.0, 32.2, 60.7, 32.6, 20.7 and 2.6 females/female, and the intrinsic rates of increase (rm) 0.014, 0.041, 0.083, 0.086, 0.077 and 0.024 females/female/day, respectively. The average total fecundities of N. bisignatus at 15, 20, 25, 30 and 32.5 ¿C were 54.7, 72.1, 96.9, 56.0 and 22.8 eggs/female, and average longevities 116.1, 108.7, 71.8, 68.8 and 43.7 days, respectively. The net reproductive rates (Ro) were 13.9, 26.4, 31.3, 15.2 and 3.6 females/female and the intrinsic rates of increase (rm) were 0.017, 0.035, 0.060, 0.051 and 0.024 females/female/day, respectively. The survival of females at each temperature was fitted using a Weibull distribution [S(t) = exp(-(t/b)c)]. Furthermore two mathematical models [Enkegaard equation: F = (a+b+x).e(c+d.x), Analytis equation: F = a.(x-xmin)n .(xmin- x)m] were fitted to the fecundity data.

Keywords: Coccinellidae, Nephus bisignatus, Nephus includens, development of immature stages, fecundity, survival, Planococcus citri, temperature

Received: November 6, 2006; Revised: April 2, 2007; Accepted: April 2, 2007; Published: July 25, 2007  Show citation

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KONTODIMAS, D.C., MILONAS, P.G., STATHAS, G.J., ECONOMOU, L.P., & KAVALLIERATOS, N.G. (2007). Life table parameters of the pseudococcid predators Nephus includens and Nephus bisignatus (Coleoptera: Coccinelidae). EJE, 104(3), 407-415. doi: 10.14411/eje.2007.060
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