Effect of sprayer, nozzle types and spraying volume on efficacy of chemical compounds against tomato leafminer Tuta absoluta (Lepidoptera: Gelechiidae)‎ infesting tomato

Abstract EN

Tomato leafminer, Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae) is a highly destructive insect pest to tomato plants and fruit and is also reported to infest other plants in the Solanacaeae family.

In the present study, three equipments were conducted to control T.

absoluta, at New Salhyia city, Sharqia Governorate.

The first equipment, Cawzer sprayer with 3 nozzles type flat fan 02F-110, with spray volume 60L/fed., Matabi sprayer with Full cone Tx-6 with spray volume 35 L/fed., and conventional motor fitted with spray gun at spray volume 300 L/fed., fitted with local spray gun produce hollow cone.

The aim of this work is to determine the effects of application method on initial and late biological efficacy of three insecticides , emamectin benzoate (Proclaim) 20% SC., at rate 60 gm/fed.; indoxacarb (Avant) 15% EC at rate 100 ml/fed and alverde (Metaflumizone) – SC.

24% at rate 400ml/fed., against T.

absoluta.

Results in two seasons (2016 and 2017) indicated that, the high efficacy gives by Matabi sprayer with volume mean diameter (VMD) 68.7-94.4μm, and N/cm2 3.94-37.8 and Cawzer sprayer with VMD 51.36- 125.35μm.

and N/cm2 18-115.5, while less efficient was obtained with conventional Motor, with VMD 480- 950μm, and N/cm2 5-21.

Otherwise, the highest toxic effect obtained with emamectin benzoate, metaflumizone and indoxacarb with Matabi and Cawzer sprayers.