Grapevine control with sulphur compounds | Varstvo vinske trte z zveplovimi propravki
2007
Absec, M., Ljubljana Univ. (Slovenia). Biotechnical Fac., Agronomy Dept. | Milevoj, L. | Simoncic, J., Drca 1, 8310 Sentjernej (Slovenia)
Our experts warn that mild winters could be the reason for greater appearance of grape powdery mildew (Uncinula necator /Schwein./Burill.), because they do not affect mycelium hibernating in eyes. Therefore, the disease has to be researched permanently. In 2001, a test was performed near Semi , in a vineyard located in Bela krajina viniferous district, planted with Modra frankinja. It included 2 sulphur compounds: Cosan and Pepelin, both registered to control grapevine against powdery mildew, and Zvepleno-apnena brozga (based on calcium polysulphide) which is normally used to control grapevine rust mites (Calepitrimerus vitis Nal.). The test was set up according to EPPO standards. The first spraying was performed on May 20, followed by other 8 sprayings, repeated in 8 to 14 days' intervals, the last one on August 8. Other agricultural measures were standard. During the growing season, the vine infestation with grape powdery mildew was evaluated (July 7, July 27, and September 5) according to a scale ranging from 0 to 5 (most infected). During the second evaluation the infection was the strongest. The vines growing in control plots got the highest marks, their average value was 4.2; followed by vines treated with Cosan with 2.6, Pepelin with 2.3, and Zvepleno-apnena brozga with 1.9. At vintage, the amount of pomace and grape sugar degree were measured for control plots, vines treated with Cosan, Pepelin, and Zvepleno-apnena brozga, separately. The smallest yield (1.4 kg pomace/vine and the highest sugar degree 96 ) was measured for control plots, Cosan (1.9 kg pomace/vine and 95 ), and Pepelin (2.0 kg pomace/vine and 95 ), the highest for vines sprayed with Zvepleno-apnena brozga (2.2 kg pomace/vine and 95 ).
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