Effect of adjuvants, spray volume and nozzle type on metconazole activity against Leptosphaeria biglobosa and L. maculans during late spring treatments in winter oilseed rape
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University of Life Sciences in Poznań, Faculty of Horticulture, Department of Phytopathology, Dąbrowskiego 159, 60-594 Poznań
Institute of Plant Protection – National Research Institute W. Węgorka 20, 60-318 Poznań
University of Life Sciences in Poznań, Faculty of Horticulture, Department of Plant Protection Methods, Zgorzelecka 4, 60-198 Poznań
Journal of Plant Protection Research 2009;49(1):113–117
In two seasons 2005–2006 the metconazole (Caramba 60 SL at the dose of 0.75 l/ha) was applicated by spraying at the beginning of flowering against phoma stem canker (Leptosphaeria biglobosa and L. maculans) in winter oilseed rape. The effect of water volume (200 and 400 l/ha), adjuvant type (Break Thru S 240 – 0.1% and Atpolan 80 EC – 0.5%), and nozzle type (XR11002 – fine droplet size and DB11002 – course droplets at pressure 0.4 MPa) on the biological efficacy of fungicide spraying was investigated in the studies. The results showed that adjuvants did not significantly influence biological efficacy of fungicide treatments against L. biglobosa and L. maculans. Generally, control of both pathogenson the leaves and stem did not depend on spray characteristics (nozzle types-droplet size). However, positive effect of air induction nozzles DB 11002 (course spray quality) on fungicide treatments against L. biglobosa, particularly with addition of adjuvant Atpolan 80 EC was observed. Two different volumes of water tested (200 and 400 l/ha) did not influence efficacy of metconazole in control L. maculans and L. biglobosa. The above suggests a possibility of decrease the volume of water used with fungicide to 200 l/ha, without a negative biological effects on fungicidal activity.
The authors have declared that no conflict of interests exist.
Zbigniew Karolewski
University of Life Sciences in Poznań, Faculty of Horticulture, Department of Phytopathology, Dąbrowskiego 159, 60-594 Poznań
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