El-Taher, A., Abdel-Wahed, M., Helmi, A., Dahi, H. (2022). Biological Aspects, Lower Developmental Threshold, and Thermal Requirements of Cotton Seed Bug, Oxycarenus hyalinipennis (Costa). Journal of Plant Protection and Pathology, 13(12), 325-328. doi: 10.21608/jppp.2023.179867.1117
Asmaa Sh. El-Taher; M. S. Abdel-Wahed; A. Helmi; H. F. Dahi. "Biological Aspects, Lower Developmental Threshold, and Thermal Requirements of Cotton Seed Bug, Oxycarenus hyalinipennis (Costa)". Journal of Plant Protection and Pathology, 13, 12, 2022, 325-328. doi: 10.21608/jppp.2023.179867.1117
El-Taher, A., Abdel-Wahed, M., Helmi, A., Dahi, H. (2022). 'Biological Aspects, Lower Developmental Threshold, and Thermal Requirements of Cotton Seed Bug, Oxycarenus hyalinipennis (Costa)', Journal of Plant Protection and Pathology, 13(12), pp. 325-328. doi: 10.21608/jppp.2023.179867.1117
El-Taher, A., Abdel-Wahed, M., Helmi, A., Dahi, H. Biological Aspects, Lower Developmental Threshold, and Thermal Requirements of Cotton Seed Bug, Oxycarenus hyalinipennis (Costa). Journal of Plant Protection and Pathology, 2022; 13(12): 325-328. doi: 10.21608/jppp.2023.179867.1117
Biological Aspects, Lower Developmental Threshold, and Thermal Requirements of Cotton Seed Bug, Oxycarenus hyalinipennis (Costa)
1Foreign Agricultural Relations, Ministry of Agriculture and Land Reclamation
2Plant Protection Department, Faculty of Agriculture, Ain Shams University, Egypt
3Plant Protection Research Institute, Agricultural Research Center, Dokki, Giza, Egypt.
Abstract
Cotton-seed-bug (CSB), Oxycarenus hyalinipennis (Costa) is a serious pest of cotton and other malvaceous, the present investigation aims to determine some biological features, developmental threshold and thermal requirements (degree-days, DD's) for cotton seed-bug, Oxycarenus hyalinipennisin Egypt. Effect of three constant temperatures (25, 30 and 35±1°C) on developmental rates of different stages of cotton-seed-bug was detected. The incubation period, nymphal and adult durations, pre-oviposition, oviposition and post-oviposition periods, male and female longevities, sex-ratio, fecundity, fertility and generation time were estimated. Data obtained revealed that, time required for development of all stages were decreased as temperature increased. Egg incubation periods were 6.66±0.36, 5.66±0.33 and 4.33±0.66 at 25, 30 and 35°C respectively. The highest percentage of egg-hatching was 98% at 25°C, and the lowest was 88% at 35°C. The nymphal durations were 25.2±0.17, 17.11±0.27 and 13.88±1.17 days at 25, 30 and 35°C. The lowest adult longevity was 19.87±1.67 day at 35°C and the highest was 37.48 days at 25°C. The sex-ratio between males and females was nearly 1:1 at both temperatures 25 and 30°C, while it was 2:1 at 35°C. The highest female fecundity was 227.7 eggs at 25°C and the lowest one was 83 eggs at 35°C. The same trend was reported for female fertility. The lower developmental threshold for egg and nymphal stage and adult longevity were 7, 12.51, and 13.85 °C, respectively and the corresponding thermal requirements were 123.8, 285.36 and 421.36 DD's.
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