World Applied Sciences Journal 28 (5): 596-599, 2013 ISSN 1818-4952 © IDOSI Publications, 2013 DOI: 10.5829/idosi.wasj.2013.28.05.81180 Corresponding Author: Wali Muhammad, Pest Warning and Quality Control of Pesticides Wing of Agriculture Department Govt. of Punjab, Pakistan. 596 Biology and Predatory Potential of Amblyseius deductus (Acarina: Phytoseiidae) on Different Densities of Tetranychus urticae (Acarina: Tetranychidae) Muhammad Ashraf Ali, Wali Muhammad, Muhammad Wasim Abbas, Muhammad Hamid Bashir, 1 1 2 2 Muhammad Afzal, Abdul Haye, Ahmad Nawaz and Muhammad Jaffar Hussain 3 1 1 2 Pest Warning and Quality Control of Pesticides Wing of Agriculture Department Govt. of Punjab, Pakistan 1 Department of Entomology, University of Agriculture, Faisalabad, Pakistan 2 Faculty of Agriculture, University of Sargodha, Pakistan 3 Abstract: Mites of the family Phytoseiidae are potential predators of various species of Phytophagous mites throughout the world. The aim of this work was to study the developmental period, fecundity rate and predatory potential of Amblyseius deductus after feeding different prey densities of two spotted spider mites (Tetranychus urticae). There were three treatment with the ratio of predator and prey i.e. T (1:5), T (1:7) and 1 2 T (1:9). The effect of T. urticae on the developmental period of A. deductus showed non significance 3 differences means at larval, protonymphal, deutonymphal and post-oviposition period in all three treatments but showed significance differences means in pre-oviposition and oviposition period. The maximum fecundity was recorded inT (1:9). third treatment i.e. 24.33±1.33 as compared to other two treatments means after feeding 3 on T. urticae. The predatory potential of larval and protonymphal stages of A. deductus showed non significant differences means while deutonymph, pre-oviposition, ovoposition and post-oviposition showed significances differences means in all three treatments. Key words: Fecundity Prey ratio Tetranychus urticae Life cycle INTRODUCTION mites the member of family phytoseiidae are potential Two spotted spider mite Tetranychus urticae (Acari: and soft bodied insects [9]. Predatory mites of the genus Tetranychidae) is considered to be one of the most Amblyseius(Acari: Phytoseiidae) are important predator of economically important pest. They suck the cell sap spider mites [10]. with the help of their needle like cheliceral stylets. Their The objective of this research was to determine the feeding results in stippling, blotching or bronzing of comparative biological parameter (Duration of different leaves which is generally followed by leaf fall, early life stages e.g larvae, protonymph, deutonymph, dropping of fruits, thus affecting quality and quantity preoviposition, oviposition, post oviposition period, of products [1]. Their attack results in premature fruit incubation period, fecundity rate and also predatory dropping and small sized fruits with low yield [2]. potential of different life stages) of Amblyseius deductus Tetranychid mites attack different crop viz., cotton, after feeding on different densities of T. urticae under peanut, bean, eggplant, squash, cucumber, corn, apple, controlled laboratory condition. peach, citrus, papaya, strawberry, castor, mulberry, rose and many other ornamental plants [3, 4]. Traditionally MATERIALS AND METHODS T. urticae has been controlled with acaricides, resulting in problems of pesticides resistance in the The experiments were conducted in the Acarology consumed products [5, 6] Biological control is Research Laboratory, Department of Agri. Entomology, economically viable and environmentally safe to University of Agriculture, Faisalabad at 27± 2 °C with control insect and mites pests [7, 8]. Among the predatory 70±5 % RH. bio-control agents for the control of phytophagous mites