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Oviposition deterrent activities of some plant extracts against tomato leaf miner, Tuta Absoluta meyrick (Lepidoptera: Gelehiidae)


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Abstract

Tuta absoluta Meyrick (Lep.:Gelechiidae) is a very serious pest worldwide, causing damage to tomatoes. In this study, the oviposition deterrence efficacy of extracts obtained from Tanacetum vulgare L. (Asteracea), Tanacetum parthenium L. (Asteracea), Aleo vera (L) (Liliaceae), Melaleuca alternifolia (Maiden&Betce)(Myrtaceae) and Juglans regia L. (Juglandecae) on Tuta absoluta Meyrick (Lep.:Gelechiidae) was investigated. Eggs laid daily were placed in Petri dishes and observed until pupa. After larvae become pupae were distinguished male or females using a stereomicroscope. After that, two male and one female were released within cage to couple during 24h. Adults were put into cages containing with extract treated plant. The experiment was replicated four times including control. Daily monitoring was conducted for fourteen days and the total number of eggs was recorded. According to the results obtained, the extract of T. parthenium showed the highest deterrence effect (98.29%) at the highest concentration (20%). The extracts of T. vulgare and A. vera, were the deterrence effect 95.43% and 94.68% in the same concentration respectively. It was reported that the deterrence effect of Gamatol, fungatol and J. regia were 92.54%, 86.52% and 79.94% at the highest concentration respectively. The percent oviposition deterrence was 89.37% at Neem Azal T/S. The percent oviposition deterrence increased with increase in concentration of plant materials

Keywords

Tuta absoluta, antimicrobial, tomatoes, gammatol, flavonoids, plant material, botanical insecticides, fungi

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