Two-sex life table of Nysius cymoides (Spinola) (Hem.: Lygaeidae) at different photoperiods under laboratory conditions

Document Type : Research Paper

Authors

1 Department of Plant Protection, Faculty of Agricultural Sciences, University of Guilan, Rasht, Iran

2 Department of Crop Production, Faculty of Agricultural Sciences, Gonbad University, Iran

3 Iranian Research Institute of Plant Protection (IRIPP), Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran

Abstract

The life table parameters are the most appropriate index for comparing the fitness of a population to diverse climatic and food-related conditions. In this study, the effect of three photoperiods of 8:16, 12:12 and 16:8 h (L:D) on the life table parameters of Nysius cymoides was studied under laboratory conditions (24±1ºC, 65±5% RH). Data were analyzed based on the age-stage, two-sex life table theory. Immature developmental times of N. cymoides under 12-and 8h photoperiods were significantly shorter than that of treatment with 16h photoperiod. The adult pre-oviposition period (APOP), total pre-oviposition period (TPOP), mean fecundity and adult longevity reared under three photoperiods showed significant differences. The highest and lowest fecundity were 56.65 eggs and 10.1 eggs at 12- and 8h photoperiods, respectively. Intrinsic rates of increase (r) were 0.011 ± 0.004, 0.044 ± 0.003 and 0.039 ± 0.003 (day-1) at 8-, 12- and 16h (L), respectively; and net reproductive rates (R0) were 2.02 ± 0.52, 13.02 ± 2.65 and 11.41± 2.12 (offspring per individual) for the respective treatments. The mean generation times (T) were 56.11 ± 1.26, 57.16 ± 1.53 and 62.32± 1.41 days, at 8-, 12- and 16h (L), respectively. The life expectancy (exj), survival rate (sxj) and cumulative reproductive rate (Rx) at 12-and 16h (L) were higher than those of 8h photoperiod. Generally, 12- and 16h photoperiods were more reasonable for N. cymoides rearing comparing with 8h photoperiod.

Keywords


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