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Current Research in Agricultural Sciences

June 2017, Volume 4, 2, pp 43-50

Stage Specific Life Table of Invasive Pest Mealybug, Phenacoccus Solenopsis (Tinsley) Under Cotton Field Conditions

Hakim Ali Sahito


Tasneem Kousar


Wali Muhammad Mangrio


Nisar Ahmed Mallah


Faheem Ahmed Jatoi


Zafar Hussain Shah


Waheed Ali Kubar

Hakim Ali Sahito 1 Tasneem Kousar 1 Wali Muhammad Mangrio 1 Nisar Ahmed Mallah 1 Faheem Ahmed Jatoi 1 Zafar Hussain Shah 1 Waheed Ali Kubar 1 

  1. Department of Zoology, Faculty of Natural Sciences, Shah Abdul Latif University, Khairpur, Sindh, Pakistan 1

Pages: 43-50

DOI: 10.18488/journal.68.2017.42.43.50

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Article History:

Received: 19 December, 2016
Revised: 21 March, 2017
Accepted: 27 April, 2017
Published: 07 June, 2017


The field study was conducted on at the experimental field of SALU – Khairpur during, 2016. Two hundred eggs were kept for each replication on cotton plants grown in large pots. When eggs hatched, the life table parameters such as; apparent mortality, survival fraction, mortality survivor ratio, indispensable mortality and k-value were studied. Natural enemies such as; Chrysoperla carneae, lady bird beetles, Spiders and Anasius bambawallae were found active on the potted and surrounding cotton plants in the field conditions. The total mortality in egg stage went to 19.00%. The mortality percentages of 1st instars due to natural enemies recorded was (18.73%) while, in 2nd instars (13.13%) mortality was recorded. The total combined mortality in 1st and 2nd instars was recorded (26.34%) and (15.64%), respectively. However, the mortality of 3rd instars and pupae due to parasitoids were recorded (7.28%) with the total mortality (10.26%) and the total mortality (54.83%) in cotton potted plants was recorded. Consequently, (45.17%) of adults survived with male and female ratio as ♂1:6.52♀, respectively. The highest apparent mortality was (26.34%), indispensable mortality (96.89) and k-value (0.13) recorded in 1st instar. The maximum survival fraction was recorded (0.90) in third instars/pupae with the total k-value generations (0.35). The study revealed that the predators and parasitoids should be encouraged in cotton field when mealybugs appear, because predators are highly voracious feeder of 1st and 2nd instars whereas;  the parasitoid, A. bambawallae is known as main controlling natural enemy of cotton mealybug.

Contribution/ Originality
This study documents over the biological parameters of cotton mealybug to check its, egg laying, mortality, survivor ratio, total life span, fecundity, fertility, different life stages, predators activity and aboitic factors with the different equations about this vigorous pest under cotton field conditions.


Fecundity, Fertility, Mortality, Life span, Eggs, Natural enemies, Ratio, and mealybug



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This study received no specific financial support.

Competing Interests:

The authors declare that they have no competing interests.


All authors contributed equally to the conception and design of the study.

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