Demographic characteristics of Cadra cautella on brown rice at different temperatures: Do diapausing individuals contribute to population growth rate?. (March 2023)

• Record Type: Journal Article
• Authors: Lin, Ya-Ying; Tang, Cheng-Kang; Saska, Pavel; Güncan, Ali; Yao, May-Chi; Tuan, Shu-Jen
• Is Part Of: Journal of stored products research. Volume 101(2023)
• Publication Date: 2023-03
• Subjects: Age-stage two-sex life table -- Almond moth -- Diapause -- Granary pest management -- Low temperature; Food -- Storage -- Periodicals; Farm produce -- Storage -- Diseases and injuries -- Periodicals; Entomology -- Periodicals; Food Contamination -- Periodicals; Food Preservation -- Periodicals; Insect Control -- Periodicals; Aliments -- Entreposage -- Périodiques; Produits agricoles -- Entreposage -- Maladies et dommages -- Périodiques; Electronic journals; 631.568
• DOI: 10.1016/j.jspr.2022.102073
• Languages: English
• ISSNs: 0022-474X

Abstract

Abstract: The almond moth, Cadra cautella (Walker) (Lepidoptera: Pyralidae), is a recognized cosmopolitan pest of stored food products throughout its worldwide distribution. To enable effective control of this pest, a thorough understanding of the effect of temperature on their population growth is required. In this study, we investigated the population growth rate of group-reared C. cautella fed on brown rice at five different temperatures (15–35 °C) using the age-stage, two-sex life table program. At 15 °C, the majority of larvae failed to reach the 2nd instar. At 35 °C, only 5 out of 150 individuals survived to the adult stage. There was no significant difference in fecundity between the three temperature groups (20, 25 and 30 °C), while a dramatic decline occurred at 35 °C (0.5 eggs/female). The intrinsic rates of increase of C. cautella were 0.0566, 0.1149, 0.1429, and −0.0901 d −1 at 20, 25, 30 and 35 °C, respectively, with significant difference between all values. Approximately 16.0% of late instar almond moth larvae showed signs of diapause induction at 20 °C, i.e., wandering behavior and delayed pupation. The developmental times of larvae (74.44 d) and pupae (17.13 d) were significantly longer in the diapausing cohort than in the non-diapausing cohort (54.89 and 15.47 d). At 20 °C, the offspring of the diapausing individuals were still able to contribute 12.98% to the net reproduction rate of the entire cohort – an amount substantial enough to require attention when planning pest management programs. In conclusion, we suggest that 15 °C can effectively limit the damage caused by C. cautella population due to their inability to develop into later instars at this temperature. Highlights: We determined the effect of temperature on population growth rate of almond moth ba sed on the age-stage two-sex life table. The highest intrinsic rate of increase was observed at 30°C; neonate developed into later stadia was unsuccessful under 15°C. Diapausing larvae at 20°C contributed a minor proportion of R 0, their potential risk in an outbreak should not be discounted.