5563
Nasr Mohamed Ahmed Abdelmaksoud
Control Of Tomato Leafminer, Tuta Absoluta (Meyrick) Using Chemical And Eco-Friendly Insecticides
insecticides, Tutaabsoluta, Emperor,Coragen, formulations, physico-chemical properties
Tomato crops (Solanaceae), usually attacked by many insectspecies, including the tomato leafminer, Tutaabsoluta (Meyrick), where its larvae cause damage up to 80-100% by making tunnels in all tomato parts.The physico-chemical properties of 12 commercial insecticides (five EC, four SC, two SG, and one WG) as well as nine naturally formulated compounds (seven EC and two W/O/W) were measured.All the tested formulations passed the tests except Action Phos and Pestbanscince they failed in the foam formation test. The efficiency of these formulations was examined against T.absoluta under laboratory and field conditions. The laboratory evaluation of the testedcommercial insecticides demonstrated thatthe nonconventional insecticides Emperor and Coragen, achieved the superior efficiency with the least LC90 values of 1.66 and 1.82 ppm, respectively, followed by Proclaim, Radiant, Vapcomic, and Challenger that gave high efficacy with LC90 values of 3.72, 4.84, 8.09, and 164.56 ppm, respectively. Alsothe naturally formulated compoundswere arranged in a descending order according to LC90 values as follows:Thymo "w/o/w" >Corian>Origo>Sagix> Rosa >Nimbecidine>Thymo "EC" >Cura>Mentho>Basi.The most promising commercial insecticides (Emperor, Coragen, Radiant, Vapcomic, and Challenger) as well as six naturally formulated compoundsThymo "w/o/w",Corian,Origo,Sagix, Rosa, andNimbecidine were applied in the field. Data showed that, concerning commercial insecticides, generally average reduction of infestation 7 DAT clarified that Emperor insecticide showed the superior reduction in infestation (98.74%) followed by Coragen (95.51%), then Vapcomic, Radiant and Challenger which recorded about 87.75, 88.48 and 84.89%, respectively. Regarding naturally formulated compounds, In general, the mean reduction in infestation during the last three periods (3, 5 and 7 DAT) showed that Nimbecidin, Rosa, Thymo and Origo resulting in a high reduction in infestation with means of (82.70, 79.67, 79.55 and 77.58%, respectively). The influence of insecticides sequence and insect traps application as a strategy for T. absoluta management was carried out. Sex pheromone and sticky traps were used for mass trapping this pest; sex pheromone traps were more effective than the sticky one. When the first infestation appeared, the non-conventional insecticides were consecutively sprayed as follows; Radiant, followed by Coragen and then Emperor (during the vegetative stage). After that during the fruiting stage the formulated essential oils Nimbecidine (commercial) and Rosa (Prepared) were respectively sprayed(during the fruiting stage).The general average of reduction in infestation reached 95.81% when non-conventional insecticides were used. Whereas, it reached 92.15% when the formulated essential oils were used
2019
Ph.d
Cairo
Agriculture