QUALITATIVE DISTRIBUTION OF SPRAY DEPOSIT BY USING SOME GROUND SPRAYING TECHNIQUES ON OLIVE TREES FOR CONTROLLING PARLATORIA OLEAE ( COLVEE ) (HEMIPTERA : DIASPIDIDAE)

The aim of this study is to evaluate the specific ground sprayer units for controlling Parlatoria oleae Colvee infesting olive trees by using different pesticides. The experiments included spray volume coverage on the olive trees and sources of pollution as pesticides lost on ground and drift spray solution. The tested sprayer units were conventional ground motor sprayer with hydraulic spray gun (860 l/fed.), knapsack motor sprayer (Taral 518) with its original pneumatic atomizer (430 l/fed.). It is worth mentioning that, this model has its poster pum. In a modification for the taral motor its atomizer was replaced by three Tee-Jet nozzles (D5-45 or D8-45 as 430 and 568 l/fed., respectively) fitted perpendicular to the air stream. In the case of D5-45 modification the conventional ground motor sprayer tank was used as source for spray solution under pressure. Super masrona (mineral spray oil) at the rate of 1-5% alone or at the rate of 1% mixed with organophosphorous Sumithion 50% EC at rate of 0.15% + 0.5 gm/liter fluoresin sodium were sprayed in this experiment. Qualitative distribution of droplets using water sensitive cards indicated that, conventional ground motor sprayer has the highest number of droplets/cm2 and highest droplet sizes VMD μm per droplets over most of measured spots. Data also showed that, conventional ground motor sprayer should be usedtwice spray volume and subsequently twice sprays material (pesticide) as the modified sprayer. Taral motor sprayer with three Tee-Jet nozzles D8-45 came in between. Concerning the lost spray solution on the ground and the spray drift, conventional ground motor sprayer caused the highest lost of spray solution on the ground and drift spray followed by Taral motor sprayer with three Tee-Jet nozzles D8-45 and the least was taral motor sprayer with three Tee-Jet nozzles D5-45.The presented results indicated the superiority of the tested Taral motor sprayer with Tee-Jet nozzles D5-45 (430 l/fed.) over the other three tested sprayers in minimizing the time of spraying, reducing spray volume and pollution under Egyptian conditions.