Effect of temperature on demographic parameters of the hawthorn red midget moth, Phyllonorycter corylifoliella, on apple
1Department of Agricultural Entomology, Faculty of Agriculture, Tarbiat Modares University, P.O.Box:14115-336,
Tehran, Iran
2Department of Plant Protection, Faculty of Agriculture, Razi University, Kermanshah, Iran
Abstract
The hawthorn red midget moth, Phyllonorycter corylifoliella (Hübner) (Lepidoptera: Gracillariidae), is one of the most serious pests of apple and pear orchards in Iran, however little is known about its biology and relationship with environmental factors. The reproduction and population growth parameters of P. corylifoliella were examined at six constant temperatures (15, 20, 25, 30, 33 and 35º C) on apple var. golden delicious. At 35° C, P. corylifoliella failed to develop beyond the first instar. The lowest (13%) and highest (64%) mortality rates of immature stages occurred at 25 and 33° C, respectively. The life expectancies (ex) decreased with increasing of age and the life expectancies of one-day-old larvae were estimated to be 38.68, 33.34, 35.11, 26.28 and 16.11 days at 15, 20, 25, 30 and 33° C, respectively. The highest intrinsic rate of natural increase (rm), net reproductive rate (Ro) and finite rate of increase (λ) at 25º C were 0.100 ± 0.003, 47.66 ± 5.47 and 1.11 ± 0.00, respectively. The mean generation time (T) decreased with increasing temperatures from 86.86 ± 0.53 days at 15° C to 33.48 ± 0.16 days at 30° C. Doubling time (DT) varied significantly with temperature and the shortest doubling time was obtained at 25º C. The results of this study provide direction for future research on evaluating the performance of P. corylifoliella and the efficiency of its natural enemies in apple orchards under variable environmental conditions.
Keywords: intrinsic rate of increase, reproduction, life table, Iran
Abbreviation: ex, life expectancy; lx, age-specific survival rate; mx, age-specific fecundity; Ro, net reproductive rate;
rm, intrinsic rate of natural increase; T, generation time; DT, doubling time
Correspondence:
*talebia@modares.ac.ir
Associate Editor: T. X. Liu was editor of this paper.
Received: 4 April 2009 | Accepted: 1 February 2010 | Published: 13 August 2010
Copyright: This is an open access paper. We use the Creative Commons Attribution 3.0 license that permits unrestricted use, provided that the paper is properly attributed.
ISSN: 1536-2442 | Volume 10, Number 134
Amiri A, Talebi AA, Zamani AA, Kamali K. 2010. Effect of temperature on demographic parameters of the hawthorn red midget moth, Phyllonorycter corylifoliella, on apple. Journal of Insect Science 10:134, available online: insectscience.org/10.134
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