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Effect of Temperature on Demography and Predation Rate of Menochilus sexmaculatus (Coleoptera: Coccinellidae) Reared on Phenacoccus solenopsis (Hemiptera: Pseudococcidae)

Effect of Temperature on Demography and Predation Rate of Menochilus sexmaculatus (Coleoptera: Coccinellidae) Reared on Phenacoccus solenopsis (Hemiptera: Pseudococcidae)

Ayesha Iftikhar1,*, Muhammad Asif Aziz1, Muhammad Naeem1, Munir Ahmad1 and Tariq Mukhtar2

1Department of Entomology, Pir Mehr Ali Shah, Arid Agriculture University, Rawalpindi
2Department of Plant Pathology, Pir Mehr Ali Shah, Arid Agriculture University, Rawalpindi

*      Corresponding author: aishaiftkhr@yahoo.com

 

ABSTRACT

Zigzag beetle, Menochilus sexmaculatus Fabricius (Coleoptera: Coccinellidae) is an important predator of cotton mealy bug, Phenacoccus solenopsis Tinsley (Hemiptera: Pseudococcidae). Understanding the effect of temperature variations on its demography and predation rate is necessary to predict the population dynamics of this beetle against cotton mealy bug. Age-stage, two sex life tables of zigzag beetle were constructed at three different temperature regimes: 24 ± 0.5 °C and 27 ± 0.5 °C with 60-70% R.H. and ambient condition (32 ± 4 °C; 16-50% R.H.) with 14:10 h (L:D) photoperiod using cotton mealy bug as a host. According to the results, the immature duration and adult longevity were comparatively longer at lower temperature (24 ± 0.5 °C) and shorter at higher temperatures. Among population dynamic parameters, net reproductive rate (R0) was 216.52, 105.99 and 27.07 off-springs per individual, intrinsic rate of increase (r) was 0.1543, 0.1600 and 0.1518 off-springs per female per day at 27 ± 0.5, 24 ± 0.5, and 32 ± 4.0 °C, respectively. Survival rate (sxj) and age-stage specific fecundity (fx7) were greater at 24 ± 0.5 °C. Among immature stages, 4th instar was the most voracious with highest predation rate. Adult females consumed more cotton mealy bug nymphs at 24 ± 0.5 °C. Net predation rate (C0) of the beetle was 5548, 4463.2 and 2016.90 at 24 ± 0.5 °C, 27 ± 0.5 °C and 32 ± 4 °C, respectively. The values of transformational rate (Qp) exhibited that 25.62, 42.11 and 74.50 nymphs of P. solenopsis were required per female beetle to lay one egg at 24 ± 0.5 °C, 27 ± 0.5 °C and 32±4°C, respectively. Finite predation rate (ω) was more (7.64) at 24±0.5°C followed by 27±0.5°C (6.56) and the lowest at 32 ± 4 °C (0.66). Adult beetles proved strong natural enemies of P. solenopsis. Our study provides detailed basic information for successful rearing of M. sexmaculatus in the laboratory and use as a bio-control agent against cotton mealy bug in the field at different temperature conditions.
 

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Pakistan Journal of Zoology

December

Vol. 50, Iss. 6, Pages 1999-2398

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