The Effect of Irrigation on the Occurrence and Intensity of Venturia Inaequalis of Apple

Abstract

The highest intensity of V. Inaequalis attack on apple leaf was noted in the control variant without application of fungicide. In the variant with pre-irrigation soil moisture, 80% of PVK was 26% and gradually decreased to control irrigation without irrigation (20%). The lowest infestation intensity was on the control variant without irrigation (0.6%), where treatment with the fungicide Score was performed. The largest percentage of the intensity of attack by V. Inaequalis on apple fruit was on the variant without chemical protection (6.2%), where pre-irrigation soil moisture was maintained at 80% of PVK. In all variants with chemical protection in irrigation conditions there was a low intensity of attack by V. Inaequalis (0.1-0.5%).

Najveći intenzitet napada V. Inaequalis na lišću jabuke zabeležen je na kontrolnoj varijanti bez primene fungicida. Na kontrolnoj varijanti sa predzalivnom vlažnošću zemljišta 80% od PVK procenat zaraze bio je 26% i postepeno opadao ka kontrolnoj varijanti bez navodnjavanja (20%). Najmanji intenzitet zaraze je bio na kontrolnoj varijanti bez navodnjavanja (0,6%), gde je obavljen tretman sa fungicidom Score. Najveći procenat intenziteta napada V. Inaequalis na plodu jabuke bio je na varijanti bez hemijske zaštite (6,2%), gde je održavana predzalivna vlažnost zemljišta 80% od PVK. Na svim varijantama sa hemijskom zaštitom u uslovima navodnjavanja ostvaren je nizak intenzitet napada V. Inaequalis (0,1-0,5%).