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Control of fungal diseases in winter wheat

evaluation of long-term field research in southern Sweden

Wiik, Lars (2009). Control of fungal diseases in winter wheat. Diss. (sammanfattning/summary) Alnarp : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2009:97
ISBN 978-91-576-7444-9
[Doctoral thesis]

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The relationships between plant diseases, winter wheat characteristics, air temperature and precipitation, site factors and agricultural practices were investigated. Regression analyses revealed that control of LBDs (Leaf Blotch Diseases, including septoria tritici blotch, stagonospora nodorum blotch and tan spot) explained 74% of the yield increase achieved by fungicide treatment at GS 45-61, followed by powdery mildew (20%), brown rust (5%) and yellow rust (1%). Yield of both untreated and fungicide-treated plots increased from 6000 to 12000 kg/ha over the period 1983-2005. Single eyespot treatment improved mean yield by ~320 kg/ha/yr during the period 1977-2002, mainly due to occasional years with severe eyespot. A fungicide treatment at GS 45-61 increased mean yield by 10.3% or 810 kg/ha/yr (9.9% or 660 kg/ha/yr for 1983-1994 and 10.7% or 970 kg/ha/yr for 1995-2005) due to increased TGW and grain numbers, especially in high yielding stands. Air temperature and precipitation as monthly means explained more than 50% of the variation between years regarding yield increase, TGW, LBDs, brown rust, yellow rust and eyespot, but less than 50% of the variation in yield and powdery mildew. Precipitation in May was the factor most consistently related to LBD disease intensity, and adding another two weather factors further improved the degree of explanation. Weather factors in the preceding growing season influenced growth stage, powdery mildew and brown rust. Mild winters and springs favoured the biotrophs, i.e. powdery mildew, brown rust and yellow rust. The mean net return from fungicide use was negative in 10 years and less than 50% of the entries were profitable to treat in 11 years. Fungicide use was in fact more profitable (mean net return 21 compared with 3 €/ha) during the latter part of the period (1995-2007) than in the earlier part (1983-1994). The role of site factors and agricultural factors is complex but some factors, such as pre-crop and dose of nitrogen, can probably be used in plant disease warning and prediction models. Wheat as pre-crop to wheat gave 1.6 tons/ha lower yield than rape as pre-crop. The results confirm the potential and limits of fungicides and the need for supervised control strategies that include factors affecting disease, yield, interactions and overall profitability.

Authors/Creators:Wiik, Lars
Title:Control of fungal diseases in winter wheat
Subtitle:evaluation of long-term field research in southern Sweden
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2009
Number of Pages:108
ALLI Wiik, L. 2009. Yield and disease control in winter wheat in southern Sweden during 1977-2005. Crop Protection 28 (1), 82-89. II Wiik, L. & Ewaldz, T. 2009. Impact of temperature and precipitation on yield and plant diseases of winter wheat in southern Sweden 1983-2007. Crop Protection 28 (11), 952-962. III Wiik, L. & Rosenqvist H. 2010. The economics of fungicide use in winter wheat in southern Sweden. Crop Protection 29 (1), 11-19. IV Wiik, L. & Englund, J.-E. 2009. Influence of site factors and agricultural practices on yield and plant diseases of winter wheat in southern Sweden. (Manuscript).
Place of Publication:Alnarp
ISBN for printed version:978-91-576-7444-9
Publication Type:Doctoral thesis
Full Text Status:Public
Agrovoc terms:triticum, winter crops, crop yield, mycosphaerella graminicola, fungal diseases, fungicides, disease control, site factors, weather, temperature, precipitation, profitability, field experimentation, sweden
Keywords:Septoria tritici, weather, economics, disease prediction, IPM
Permanent URL:
ID Code:2183
Department:(LTJ, LTV) > Department of Plant Protection Biology
Deposited By: Lars Wiik
Deposited On:25 Nov 2009 00:00
Metadata Last Modified:02 Dec 2014 10:16

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