Comparison between electrostatic spraying and traditional ground spraying techniques by using certain insecticides on Thrips tabaci (Thysanoptera: Thripidae)‎ infesting onion in Qalubiya Governorate

Abstract EN

The present work was carried out to determine quality, spray deposited on the plant, lost spraying by drift and lost spraying on ground between plants.

As well as the biological efficiency produced with possibility of using the least amount of pesticides to reach the highest efficiency against controlling Thrips tabaci Lindeman (Thysanoptera: Thripidae) on onion crop.

The used ground equipment were knapsack motor mist blower sprayer with shear unit (79 L/fed.), knapsack blower sprayer with electrostatic charging unit (42 L/fed.), rotary hand held sprayer (18 L/fed.), knapsack hydraulic hand held sprayer (56 L/fed.) and conventional ground motor sprayer with two spray guns (578 L/fed.).

Marshal insecticide was used for controlling onion thrips (T.

tabaci) infesting onion fields with recommended dose during season 2017.

In the second season 2018 marshal and chinook insecticides were used with recommended doses and 3/4 recommended dose during season 2018.

In the second season 2018 experimental results showed that, the highest mortality rate for T.

tabaci infesting onion was revealed by knapsack motor mist blower with electrostatic unit spraying 95 % followed by knapsack mist blower motor sprayer with its shear unit, rotary hand held sprayer, knapsack hydraulic hand held sprayer and conventional ground motor sprayer with spray gun were 93, 91, 77 and 72 %, respectively.

The lowest drift spray was done from electrostatic knapsack motor sprayer 42 L/fed.

and the highest drift spray was done from rotary sprayer 18 L/fed.

Conventional ground motor sprayer revealed the worst equipment in lost spraying in ground about 44% from spraying volume was lost on ground, but the best equipment saving lost spraying on ground was electrostatic Agrimondo 15.5% from spraying volume; also revealed 20% from droplets deposition on both sides of onion leaves, also pneumatic knapsack sprayer with electrostatic unit revealed a lowest drift spray but the highest equipment revealed drift spray was rotary spinning disk matabi.