How Different Populations and Host Plant Cultivars Affect Two-Sex Life Table Parameters of the Date Palm Hopper, Ommatissus lybicus (Hemiptera: Tropiduchidae)

Authors
A. Bagheri 1
Y. Fathipour 1
M. Askari-Seyahooei 2
M. Zeinolabedini 3
1 Department of Entomology, Faculty of Agriculture, Tarbiat Modares University, P. O. Box: 14115-336, Tehran, Islamic Republic of Iran.
2 Department of Plant Protection, Hormozgan Agricultural and Natural Resources Research Center, Bandar-Abbas, Islamic Republic of Iran.
3 Department of Genomics, Agricultural Biotechnology Research Institute of Iran (ABRII), Karaj, Islamic Republic of Iran.
Abstract
Worldwide distribution of the Date Palm Hopper (DPH), Ommatissus lybicus de Bergevin along with intensive regional chemical and cultural practices to control this pest provide a basis for development of high genetic divergence. This genetic divergence can result in demographically distinct populations. In this study, the demographic parameters of three genetically diverged Iranian populations of DPH (Bam, Jiroft, and Tezerj) were determined on two date palm cultivars (Berhi and Khunizi). The age-stage, two-sex life table theory was used to unveil biological differences among these populations. All experiments were carried out in a laboratory at 27±2˚C, 65±5% RH, and a photoperiod of 14:10 (L: D) hour. The results revealed significant differences in life history traits and growth parameters of different populations. The shortest development time was observed in the Bam population (75.86 and 85.03 days on Berhi and Khunizi, respectively). The highest values of the intrinsic rate of increase (r) and finite rate of increase (λ) were detected in Bam population (0.0377 and 1.0433 per day on Berhi as well as 0.0284 and 1.0288 per day on Khunizi, respectively). Based on these results, we can consider Bam as an aggressive population with higher infestation rate compared with the other populations due to its higher r and λ values as well as shorter mean generation time on both host cultivars. The significant differences in life history traits and variation in population growth parameters may suggest the presence of cryptic species among these populations. It can stem from the high genetic divergence among DPH populations which may be orchestrated by mismanagement of the pest.

Keywords

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Journal of Agricultural Science and Technology
Volume 18, Issue 6
November and December 2016
Pages 1605-1619