THE IMPACT OF THE USE DRIFT-REDUTION NOZZLES AND TURNING OFF OF THE SI SPRAYERS FAN DURING THE APPLICATION OF PLANT PROTECTION ON THEIR EFFICIENCY FOR CONTROL OF FUNGAL DISEASES OF GRAPEVINE

V poskusu v vinogradu smo preučevali vpliv tipa šobe in izklapljanja ventilatorja aksialnega pršilnika na učinkovitost fungicidov za zatiranje gliv povzročiteljic peronospore (P), oidija (O) in sive plesni (SP) vinske trte. Primerjali smo šobi Lechler TR 80 015 in ITR 80 015. Uporaba šobe ITR ni zmanjšala učinkovitosti fungicidov za zatiranje P in O na listju trte ter O na grozdju v primerjavi z učinkovitostjo doseženo pri aplikaciji fungicidov s šobo TR. Stopnja učinkovitosti fungicidov za zatiranje P in SP na grozdju se je pri uporabi šobe ITR povečala. Izklapljanje ventilatorja je pri obeh šobah povzročilo zmanjšanje učinkovitosti zatiranja gliv povzročiteljic vseh treh bolezni. Zmanjšanje je bilo pri šobi TR večje kot pri šobi ITR. Izklapljanje ventilatorja je pri uporabi šobe TR povzročilo 8,9 % izgubo pridelka grozdja in pri uporabi šobe ITR 2,9 % izgubo, v primerjavi s škropljenjem z vklopljenim ventilatorjem.In the experiment carried out in a vineyard, we studied the influence of nozzle type and the switching off the axial vineyard sprayer fan on the effectiveness of fungicides for control of fungi causing grapevine downy mildew (DM), powdery mildew (PM) and grey mould (GM). The nozzles Lechler TR 80 015 and ITR 80 015 were compared. The application of fungicides with the ITR nozzle did not decrease the fungicide efficacy for the control of DM and PM on grapevine leaves and PM on bunches, when compared to the fungicide efficacy reached via the TR nozzle application. The degree of efficiency of fungicides for the control of DM and GM on bunches was increased when applied with the ITR nozzle. Switching off the sprayer fan resulted in an effectiveness reduction of control in all three studied fungi for both types of nozzles. The level of efficacy reduction was higher with the TR nozzle. The loss of grape yield, as a result of spraying with the sprayer fan switched off, amounted to 8.9% when spraying with the TR nozzle and 2.9 % when spraying with the ITR nozzle