Two–sex life table parameters of Chilocorus bipustulatus (Col.: Coccinellidae) fed on date palm scale Parlatoria blanchardi (Hem.: Diaspididae)

Document Type : Research Paper

Authors

1 Instructor, Department of Plant Protection, Faculty of Agriculture, Vali–e–Asr University of Rafsanjan, Rafsanjan, Iran.

2 Associate professor, Department of Plant Protection, Faculty of Agriculture, Vali–e–Asr University of Rafsanjan, Rafsanjan, Iran

3 Professor, Soil Sciences and Engineering Department, Faculty of Agriculture, Vali–e–Asr University of Rafsanjan, Rafsanjan, Iran

4 Assistant Professor, Plant Protection Research Department, Kerman Agriculture and Natural Resources Research and Education Center, Kerman, Iran

10.22092/bcpp.2023.362763.337

Abstract

The date palm scale Parlatoria blanchardi (Targioni Tozzetti, 1892) (Hem.: Diaspididae) is one of the main and important pests of reducing date palm yield. The predatory coccinellid Chilocorus bipustulatus L. (Col.: Coccinellidae) is well known as the most important active natural enemy in date orchards, which feeds on scale insects, especially the date palm scale In this research, the life table parameters of C. bipustulatus were determined by feeding on the date palm scale. The experiments were carried out in growth chamber under laboratory conditions, at 25±1°C, a relative humidity of 70±5%, and a photoperiod of 16:8 h (Light: Dark). A number of 100 coccinellid eggs of the same age with less than 24 h old were studied, and the study continued until the end of the adult stage. After incubation period, the larvae were fed daily with date palm scale nymphs. The biological parameters of the coccinellid and data were analyzed based on the age–stage, two–sex life table theory. The mean and standard error of population growth parameters were calculated based on the Bootstrap method. The intrinsic rate of increase(r) (day), finite rate of increase (λ), The mean generation time (T) and the gross reproductive rate (GRR), were 0.06 ± 0.01, 1.06 ± 0.01, 56.89 ± 0.32, 34.68 ± 3.08, respectively. The results obtained from this study can make it possible to improve the efficiency of this coccinellid in integrated pest management programs against P. blanchardi by increasing its population through mass rearing and mass release.

Keywords

Main Subjects

References

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BioControl in Plant Protection
Volume 10, Issue 1
August 2022
Pages 181-193

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