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Pathogenicity of Different Isolates of Entomopathogenic Fungi on Cotton Mealybug, Phenaccocus solenopsis Tinsley

Pathogenicity of Different Isolates of Entomopathogenic Fungi on Cotton Mealybug, Phenaccocus solenopsis Tinsley

Madiha Nawaz and Shoaib Freed


Laboratory of Insect Microbiology and Biotechnology, Department of Entomology, Faculty of Agricultural Sciences and Technology, Bahauddin Zakariya University, Multan, Pakistan

*      Corresponding author: sfareed@bzu.edu.pk

ABSTRACT

Cotton mealybug, Phenacoccus solenopsis Tinsley is a destructive pest of cotton, ornamental plants and many other crops due to its polyphagous nature. A study was conducted to check the efficacy of different local isolates of entomopathogenic fungi on 2nd nymphal instar of P. solenopsis under laboratory conditions by immersion method. Three entomopathogenic fungi; Beauveria bassiana (isolates Bb-01, Bb-08), Metarhizium anisopliae (isolates Ma-11.1, Ma-2.1) and Isaria fumosorosea (isolates If-2.3, If-02) showed percent mortalities of (61.0%, 85.0%), (78.0%, 56.0%) and (52.0%, 54.0%) with LC50 values of (4.25×108, 2.54×108 spores/ml), (3.26×108, 5.08×108 spores/ml) and (6.22×108, 7.20×108 spores/ml) with LT50 (6.43, 4.80), (5.43, 6.74) and (6.66, 6.69) days at highest concentrations. Amongst all isolates, B. bassiana isolate Bb-08 was highly efficient against cotton mealybug with highest percent mortality and lowest LC50 and LT50 values. The study showed that Bb-08 can be used in the IPM of P. solenopsis.
 

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Pakistan Journal of Zoology

February

Vol. 54, Iss. 1, Pages 1-501

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