Development, Survivorship, and Reproduction of <I>Helicoverpa armigera</I> (Lepidoptera: Noctuidae) Under Constant and Alternating Temperatures

Abstract

Laboratory studies were conducted to assess the effect of temperature on the survival, development, fecundity, and longevity of Helicoverpa armigera (Hübner) at 11 constant temperatures ranging from 12.5 to 40 degrees C, as well as at five alternating temperature regimes (25-10, 30-15, 32.5-17.5, 35-20, and 35-27.5 degrees C) and under a photoperiod of 16:8 (L:D) h. H. armigera reared at constant temperatures did not develop from egg to adult (emergence) outside the temperature range of 17.5-32.5 degrees C. The alternating conditions expanded this range from 10 to 35 degrees C. The lowest developmental thresholds of the immature stages were estimated by a linear model and ranged from 10.17 (pupal stage) to 11.95 degrees C (egg stage) at constant temperature regimes and from 1.1 to 5.5 degrees C, respectively at alternating temperatures. The values of developmental thresholds estimated using the nonlinear (Lactin-2) model were lower than those estimated by the linear model for constant and alternating temperature regimes except for larval and pupal stages at constant temperatures. Mean adult longevity fluctuated from 34.4 d at 15 degrees C to 7.6 d at 35 degrees C. Females reared under all alternating temperature regimes laid more eggs than females reared at any, except the 25 degrees C, constant temperature treatment. The intrinsic rate of increase was highest at 27.5 degrees C, at both the constant and the corresponding alternating temperature regimes (0.147 and 0.139, respectively). Extreme temperatures had a negative effect on life table parameters.

Pest scenario of Helicoverpa armigera (Hub.) on pigeonpea during future climate change periods under RCP based projections in India

“…Several studies 15 , 16 , 29 , 30 , 34 , 37 , 42 , 51 , 52 predicted the pest status in different climate change scenarios using GDD and pest modelling approach and mentioned that the pest scenario is a function of emission scenarios, geographical location, climate change period and model adopted. The present paper predicted the status of H. armigera on pigeonpea during future CCPs using RCP projected temperature ensemble data across India, as little or no studies have been attempted so far.…”

Responses of holocyclic and anholocyclic Rhopalosiphum padi populations to low‐temperature and short‐photoperiod induction

“…Among the most important environmental factors affecting life‐history traits and morphology are temperature and photoperiod (Scharf et al., 2010; Vaghina, Voinovich, & Reznik, 2014). The influence of temperature on the development time and longevity of insects has been described, with insects exposed to higher temperatures having a shorter life span (Ismaeil et al., 2013; Mironidis & Savopoulou‐Soultani, 2008) and those exposed to longer photoperiods having a longer developmental period, greater longevity, and increased fecundity. The age at first reproduction is also influenced by the photoperiod (Greenberg, Sappington, Adamczyk, Liu, & Setamou, 2008; Malaquias et al., 2010; Reznik & Vaghina, 2013).…”

Temperature-dependent development of Helicoverpa armigera (Lepidoptera: Noctuidae) at constant temperatures: instar pathways and stage transition models with semifield validation

“…Many studies have been conducted worldwide to examine the development of H. armigera in relation to effects of temperatures or host plants (Casimero et al 2000, Jallow and Matsumura 2001, Liu et al 2004, Mironidis and Savopoulou-Soultani 2008, Jha et al 2012, Barbosa et al 2016, Noor-ul-Ane et al 2018, Muchalak et al 2020, Salehi et al 2020, Fathipour et al 2021, Murua et al 2021). However, most of these studies have dealt with biological characteristics such as life-table statistics at one temperature rather than a wide range of temperatures.…”

“…Data sets for temperature-dependent development in a range of temperatures are needed to construct a phenology model with related thermal parameters (Curry et al 1978a, Curry and Feldman 1987, Kim and Lee 2010. Currently, only a few such data sets can be found in reports from Mironidis and Savopoulou-Soultani (2008) and Jallow and Matsumura (2001). The latter study was carried out in the temperature range of 13.3-32.5 °C.…”