Biological Activity of some Natural Plant Extracts and Bio-Pesticides against Tomato Leafminer, Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae) and their Residues on Tomato Fruits
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چکیده
Five new pesticides were evaluated for their effectiveness in the control of Tuta absoluta (Meyrick), (Lepidoptera : Gelechiidae) on tomato plant. The effect of pesticides against egg and larvae were estimated after 2, 5 and 7 days from application. The highest reduction percentage of eggs of Tuta absoluta during two successive seasons achieved by Emacit (81.25 and 74.5) % respectively after 7 days from application. However, during the first season, the lowest reduction percentage of eggs occurred by Challenger (10.77 %) whereas, during the second season, the lowest reduction percentage of eggs achieved by Tracer ® (28.62 %) after 7 days from application. On the other hand, the highest reduction percentage of larvae occurred by Tracer and Challenger after 7 days from application. The residual behavior of azadirachtin (Nimbecidine 0.03 % EC), spinosad( Tracer 24% SC), chlorfenapyr (Challenger 36% SC) and emamectin benzoate (Emacit 5% SG), in tomato fruits under the environmental conditions of Egypt was studied. The rate of recovery for azadirachtin, spinosad, chlorfenapyr and emamectin benzoate residues from spiked samples of tomato fruits were averaged ranged from 83.07 % to 93.31 % The pre – harvest interval (PHI) was determined to be 0, 1.87, 6.45, and 6.33 days for tomato with azadirachtin, spinosad, chlorfenapyr and emamectin benzoate under prevailed local field conditions respectively. Results showed that waiting for the recommended pre harvest intervals, indicated on the prospectuses of both pesticides, lowered the residue levels to within acceptable limits.
منابع مشابه
Effects of emamectin benzoate combined with acetamiprid, eforia and hexaflumuron against Tuta absoluta (Lep.: Gelechiidae)
Tomato leafminer, Tuta absoluta Meyrick (Lepidoptera: Gelechiidae) is one of the most destructive pests of tomato in many parts of the world including Iran. The toxicity of emamectin benzoate alone and combined with acetamiprid, eforia (thiamethoxam + lambda-cyhalotrin) and hexaflumuron was evaluated against 2nd instar larvae of Tuta absoluta (Meyrick) under 25 ± 1 °C, the relative humidity of ...
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The tomato leafminer Tuta absoluta Meyrick is a key insect pest of tomato in Tunisia and in many other countries around the world. The present study was carried out to attempt to acquire better knowledge of the biology of this insect and to implement suitable prophylactic control tools for T. absoluta in Northeastern Tunisia. Under greenhouse conditions, T. absoluta females exhibited a stronger...
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Tomato leafminer, Tuta absoluta Meyrick (Lepidoptera: Gelechiidae) is one of the most destructive pests of tomato in many parts of the world including Iran. The toxicity of emamectin benzoate alone and combined with acetamiprid, eforia (thiamethoxam + lambda-cyhalotrin) and hexaflumuron was evaluated against 2nd instar larvae of Tuta absoluta (Meyrick) under 25 ± 1 °C, the relative humidity of ...
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Tomato leaf miner Tuta absoluta (Meyrick, 1917) (Lepidoptera: Gelechiidae), a devastating pest of tomato originating from South America has been recorded in Serbia on three localities: in tomato main greenhouse and open field production area located in the vicinity of town Leskovac (South Serbia), in surroundings of the village Donji Vrtogoš (near town Vranje, South Serbia) and in a greenhouses...
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تاریخ انتشار 2015