Monitoring the effects of active substances used to treat Plasmopara viticola in Nitra wine district during the 2023 growing year

Ailer, Štefan and Benešová, Lucia and Janás, Martin and Forneck, Astrid and Ivanova, Violeta (2024) Monitoring the effects of active substances used to treat Plasmopara viticola in Nitra wine district during the 2023 growing year. In: XXIII. Slovak and Czech Conference on Plant Protection, 10-12 Sept 2024, Nitra, Slovakia.

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Abstract

Downy mildew (Plasmopara viticola) is grapevine’s most severe fungal disease. The purpose of this
study was to test the ability of active substances (AS) to provide chemical protection of the Veltlín
green variety during the 2023 growing year, in Nitra wine district, in the area of Nitrianske
Hrnčiarovce, plot number 979/5. The plot was divided into 2 sections, each containing 120 vines of
their respective variant. The vineyard was 52 years old and the technique used was simple curtain
with the K5BB rootstock.
Dates and AS used in the treatment of variant 1: 4.6.2023 Azoxystrobin 93.5 g.l
-1
.;
12.6.2023 metalaxyl-M 40 g.kg
-1
+ mancozeb 640 g.kg
-1
+ folpet 500 g.l
; 23.6.2023 mandipropamide, 250 g.kg
+
zoxamide, 240 g.kg
-1
.; 9.7.2023 copper oxychloride 658 g.kg
-1
and benalaxyl 37.5 g.kg
+ folpet 480
g.kg
-1
.
Dates and AS used in the treatment of variant 2: 4.6.2023 copper hydroxide 770g.kg
.; 12.6.2024
mancozeb 750 g.kg
-1
; 23.6.2023 metiram 550 g.kg
-1
+ pyraclostrobin 50 g.kg
-1
; 9.7.2023 cooper
oxychloride 658 g.kg
-1
.
The method utilising a combination of contact and systemic AS proved to be reliable (variant 1).
However, direct contact AS failed to suppress the tremendous infectious pressure of downy mildew
in the 2023 growing year. The use of contact AS in the treatment of variant 2 caused severe damage
to the inflorescences during the BBCH 60-69 phenophases. The systemic mixture was administered
during the second treatment due to the acute symptoms present on the inflorescences and leaves. By
this point, the administration of systemic AS no longer yielded any desired effects. Variant 2 suffered
additional indirect damage caused by the so-called peak downy mildew, as a result of exposure to a
contact mixture on 9.7.2023 (BBCH 77 – 79), which decreased the wood’s assimilation and
maturation rates. Gentle protection regimens applied during critical growing years require that the
vines be treated every 7 days, at the bare minimum, using suitable combination of approved AS, in
addition to auxiliary substances. In the future, gentle protection regimens will likely be succeeded by
the cultivation of PIWI varieties.

Item Type:	Conference or Workshop Item (Poster)
Subjects:	Agricultural Sciences > Agriculture, forestry, and fisheries Natural sciences > Chemical sciences
Divisions:	Faculty of Agriculture
Depositing User:	Violeta Ivanova Petropulos
Date Deposited:	10 Dec 2024 11:43
Last Modified:	10 Dec 2024 11:43
URI:	https://eprints.ugd.edu.mk/id/eprint/35169

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