In 2020 the trial was performed in the vineyard near Mirna Peč, containing three backpack sprayers for spraying small vineyards. The first was hand knapsack sprayer Solo 425, the second was battery knapsack sprayer Solo Accu and the last motorized knapsack mistblower Solo 444. While in the last period on this area leafhopper (Scaphoideus titanus) is present, the quality of spray deposit after spraying with three backpack spraying devices and two contact insecticides to control this pest was compared. It was found out that the spray coverage of all three knapsack spraying devices was similar and amounted over 35 %. When using motorized mistblower the larger number of spray impacts per cm2 was determined. On the outer part of the grapevine, both on the top and at the bottom, the higher insecticide coverage was established compared to inner part of the grapevine, both at the top and at the bottom. Also the number of spray impacts per cm2 was larger on the outer part of the vine compared to inner part. After first insecticide spraying using Exirel the number of nymphal instars did not decrease greatly, while after second insecticide spraying with Decis 2,5 EC their number decreased to a minimum. Results show that comparable spray deposit and insecticide effect on leafhopper can be achieved also with hand knapsack sprayers and battery knapsack sprayers compared to motorized mistblowers, which are most in use for spraying small vineyards.
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