by F. Madeira, UdL

 

At University of Lleida, one of the objectives to improve safety and sustainability of pesticide application is the adjustment of the amount of pesticide to be applied to get the expected efficacy while keeping pesticide side effects as low as possible. At this point is crucial to know the efficiency of the most used sprayers in vineyards.

To evaluate the efficiency of three types of sprayers at two different grape growth stages trials were carried out in Raïmat (Lleida, Spain) with three different hydropneumatic multirow sprayers: Ilemo Hardi IRIS, Makato SEP MB and Ilemo Hardi Mercury multioutlets. First trials were carried out at early stages of vineyard (LAI: 0.38; 37 BBCH Scale) and the others at full stages (LAI: 1.54; 75 BBCH Scale). Deposition of pesticides on leaves and ground losses were measured by application of metals as tracers. The experimental design consisted of 3 replicates per treatment and 4 vines per replication (plot).

evaluation1

As it was expected, depositions are higher at early stages than at full stages due to the canopy total area. This means that the efficiency increases throughout the vegetative growth. Regarding the type of sprayer, the multioutlets ones (Makato SEP MB and Ilemo Hardi Mercury multioutlets) are more efficient at early stages, and at full stages occurs the opposite trend. This may be due to the design of the sprayer itself.

evaluation2

This data will be useful to calculate the optimum volume rate for each type of sprayer at the DSS.