Population Projection and Development of the Mythimna loreyi (Lepidoptera: Noctuidae) as Affected by Temperature: Application of an Age-Stage, Two-Sex Life Table

Abstract

The Mythimna (=Leucania) loreyi (Duponchel) has recently emerged as a major pest of grain crops in China. Little is known about its basic biology and ecology, making it difficult to predict its population dynamics. An age-stage, two-sex life table was constructed for this insect when reared on maize in the laboratory at five constant temperatures (18, 21, 24, 27, and 30 °C). Both the intrinsic rate of increase (r) and finite rate increase (λ) increased as temperature significantly increased and mean generation time (T) decreased significantly with increasing temperature. The highest values for net reproductive rate (R0) and fecundity were observed at 24 °C. However, M. loreyi was able to develop, survive, and lay eggs at all temperatures tested (18-30 °C). Development rates at different temperatures for the egg, larval, pupal, as well as for a total preoviposition period, fit a linear equation. The lower threshold temperatures of egg, larval, pupal, preoviposition, and total preoviposition period were 8.83, 10.95, 11.67, 9.30, and 9.65 °C, respectively. And their effective accumulated temperatures were 87.64, 298.51, 208.33, 66.47, and 729.93 degree-days, respectively. This study provides insight into the temperature-based phenology and population ecology in M. loreyi. The results will benefit population dynamics monitoring, prediction, and management of this insect pest in the field.

Effect of Temperature on the Development, Survival, and Fecundity of Heliothis viriplaca (Lepidoptera: Noctuidae)

“…In this study, the developmental duration, survival rate, female fecundity, and population variables of H. viriplaca were determined at different temperatures. The results show that temperature had a significant effect on the growth and reproduction of H. viriplaca , which is consistent with the many studies on the effect of temperature on insect growth and development reporting a longer developmental duration at low temperatures and a shorter developmental duration at high temperatures ( Xu et al 2012 , Qin et al 2017 ). In northeastern China, H. viriplaca has two generations per year.…”

“…In contrast, when I is lower than 1, the size of the next generation will be lower than that of the previous one ( Pang and Liang 1995 ). The intrinsic rate of increase ( r ) is a useful parameter describing population dynamics, which includes survival, development, and reproduction ( Farhadia et al 2011 , Qin et al 2017 ). In our experiment, the I value of H. viriplaca was exceeded at each temperature indicating that this insect species has a strong reproductive capacity and environmental adaptability.…”

Comparison of pheromone trap design and lures for Spodoptera frugiperda in Togo and genetic characterization of moths caught

“…Specifically, the L. loreyi pheromone composition (Z9-14:Ac, Z7-12:Ac, and Z11-16:Ac) is comparable to the 3C lure, consistent with traps with this lure having the highest L. loreyi capture frequency. Leucania loreyi is distributed throughout Africa, Asia, and the Middle East, attacking grain and sugar crops (Joomun et al, 2012;Qin et al, 2017). These observations are remarkably similar to the relationship between fall armyworm and L. phragmatidicola in North America, where in certain regions the 3C and 4C lures attracted both species but the 2C lure was only effective with fall armyworm (Fleischer et al, 2005).…”

Sublethal Effects of Triflumezopyrim on Biological Traits and Detoxification Enzyme Activities in the Small Brown Planthopper Laodelphax striatellus (Hemiptera: Delphacidae)

“…Research on insect life tables is one of the imperative aspects of insect population dynamics, and changes in insect populations are influenced by multiple factors, including food, temperature, light, their respective hosts (Tuan et al, 2014;Zhang et al, 2015;Qin et al, 2017), and especially the different kinds of chemical pesticides. Our results showed that the fecundity (including r, λ, and R 0 ) of L. striatellus was significantly decreased following triflumezopyrim treatment and population expansion of L. striatellus was suppressed.…”