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    Effects of temperature on baseline susceptibility and stability of insecticide resistance against Plutella xylostella (Lepidoptera: Plutellidae) in the absence of selection pressure
    (Elsevier, 2020) Jaleel, Waqar; Saeed, Shafqat; Naqqash, Muhammad Nadir; Sial, Muhammad Umair; Ali, Muqarrab; Zaka, Syed Muhammad; Sarwar, Zahid Mahmood
    Plutella xylostella L. (Lepidoptera: Plutellidae) is an important pest causing significant losses to vegetables worldwide. Insecticides resistance in P. xylostella is a serious issue for scientists since last 30 years. However, deltamethrin and Bt Cry1Ac are commonly used insecticides against P. xylostella but studies involving development of resistance in P. xylostella against these two insecticides at different temperatures are lacking. The current study was aimed to find out the toxicity of deltamethrin and Bt Cry1Ac, and resistance development in P. xylostella. Results showed that the positive correlation between the temperature and toxicities of deltamethrin and Bt Cry1Ac. The results indicated -0.051, -0.049, -0.047, and -0.046 folds of deltamethrin resistance at 15 degrees C, 20 degrees C, 25 degrees C, and 30 degrees C temperatures, respectively from 1st to 12th generations. The toxicity of Bt Cry1Ac after 24 h was 2.2 and 4.8 folds on 1st generation at 20 degrees C and 25 degrees C temperatures, respectively compared to the toxicity recorded at 15 degrees C (non-overlapping of 95% confidence limits). Based on the results of this study, it is concluded that the temperature has a positive correlation with the toxicity of deltamethrin and Bt Cry1Ac against the larvae of P. xylostella. This study suggests that deltamethrin and Bt Cry1Ac can be included in the management program of P. xylostella on many vegetable crops. The baseline susceptibility data might be helpful to understand the resistance mechanisms in P. xylostella. (C) 2019 Production and hosting by Elsevier B.V. on behalf of King Saud University.
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    Genus Spodoptera (Hadeninae: Noctuidae: Lepidoptera): A New Species from Southern Punjab, Pakistan
    (Zoological Soc Pakistan, 2021) Sarwar, Zahid Mahmood; Malik, Ayub Iqbal; Suhail, Maryam; Saeed, Shafqat; Sial, Muhammad Umair; Jaleel, Waqar; Naqqash, Muhammad Nadir
    A comprehensive and a comparative taxonomic study of new species of the genus Spodoptera i.e. Spodoptera hirsutus is very similar to the Spodoptera litura but easily distinguish on the basis of different characters of genitalia. Specimens of this genus were identified on the base of their genitalia characters. This new species Spodoptera hirsutus was collected from Muzzafarghar with the help of light traps. The abdomen was dissected for the removal of genitalia and these genitalia were mounted permanently with Hoyer's medium. A key to the species of the genus Spodoptera from Pakistan is also given here. Taxonomic review of Noctuidae becomes superlative and very essential with this contextual the state of Pakistan. This was selected to the taxonomic study of Noctuidae. This research is initiative clue for further description, illustration and classification of unidentified species of the genus Spodoptera from Pakistan.