Bazı biyopreparatların Pamuk beyazsineği ve Domates güvesi’ne laboratuvar koşullarında etkinliği

Objective: This study was carried out to determine the lethal effect of Azadirachta indica A. Juss (Meliaceae) and Melaleuca alternifolia (Maiden & Betche) Cheel (Myrtaceae) biopreparations that containing different amounts of bioactive on Bemisia tabaci Genn. (Hemiptera: Aleyrodidae) nymphs and Tuta absoluta Meyrick (Lepidoptera: Gelechiidae) larvae. Material and Methods: In laboratory studies, the insecticidal effects of 2 commercial neem preparations and 11 preparations obtained from two different plant extracts (0.5%, 1.0% and 1.5% solution per preparation) on cotton whitefly and tomato leaf miner were determined by using leaf dipping method. Results: The efficacy of the preparations increased with increasing dose. At the highest dose; according to the evaluations made seven days after the application in the trials conducted with B. tabaci; efficacy of the preparations containing the Alpha tops components of the tea tree were between 67.37 to 75.79%, the preparations containing the Gamma tops components between 93.68 to 97.89% and the preparations containing the Neem extracts between 91.93 and 95.79%. In the trials conducted with T. absoluta, according to the evaluations made ten days after the application; efficacy of the preparations containing the Alpha tops components of the tea tree were between 40.00 and 70.00%, the preparations containing the Gamma tops components between 82.50 and 95.00%, and the preparations containing Neem extracts between 87.50 and 97.50%. Commercial neem preparations were the most effective preparations with 100% efficacy against both pests. Conclusion: Although 1% and 1.5% doses both of preparations of tea tree containing Gamma tops components and preparations containing Neem extract can significantly control Bemisia tabaci and Tuta absoluta, it is thought that these data should be supported by field studies.