Tag Archives: net blotch

2134–2143 P. Sooväli, M. Koppel, E. Lauringson and L. Talgre
The advantage of Decision Support System for managing spring barley disease in Estonia
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The advantage of Decision Support System for managing spring barley disease in Estonia

P. Sooväli¹*, M. Koppel¹, E. Lauringson² and L. Talgre²

¹Crop Research Institute, J. Aamisepa 1, EE48309 Jõgeva, Estonia
²University of Life Sciences, Kreutzwaldi 1, EE51014 Tartu, Estonia
*Correspondence: pille.soovali@etki.ee

Abstract:

A Decision Support System (DSS) I-Taimekaitse focusing on use of timely applied and reduced fungicide rates in control of cereal diseases has been tested in field trials since 2003. We compared the conventional treatment and the DSS-based spray practices in 18 field trials in five agricultural locations over 7-year period. Efficacy of the control of net blotch caused by Pyrenophora teres (Drechsler, am Drechlera teres Sacc. Shoem), the main fungal disease in spring barley has been tested to determine the economic advantage of DSS use. Compared with the conventional spray practices, the advantage I-Taimekaitse resulted in reduction of application doses by 30 to 60% of the registered rate. According to I-Taimekaitse, the fungicides were applied mainly between heading and flowering growth stages (GS 55–65), whereas traditional routine spraying is commonly made at booting (GS 37–49). The experiment clarifies the cost-benefit of using DSS-based approach in barley disease management with average yield increase above the control in 12.8% and above the conventional treatment in 14.1%. I-Taimekaitse gave competitive disease control and average yield output reduction compared with conventional practice by 9%. In general the Treatment Frequency Index applied in conventional treatment was 0.65 and in DSS 0.41. Although the cost of treatment expense in DSS was 20% less compared with conventional practice, the performance of conventional used spray practices was outstanding in economic return.

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721-728 G. Statkevičiūtė and A. Leistrumaitė
Modern varieties of spring barley as a genetic resource for disease resistance breeding
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Modern varieties of spring barley as a genetic resource for disease resistance breeding

G. Statkevičiūtė and A. Leistrumaitė

Cereal Breeding Department, Institute of Agriculture, Lithuanian Research Centre forAgriculture and Forestry, Instituto av. 1, Akademija, Kedainiai distr., LT 58344,Lithuania; e-mail: grazinastat@lzi.lt

Abstract:

The large variation in net blotch resistance is observed among barley germplasm, but the range of European commercial cultivars of spring barley have various degree of susceptibility. This study was designed to test 150 West European ecotype spring barley varieties and breeding lines in the field for resistance to net blotch (Pyrenophora teres) and powdery mildew (Blumeria graminis f.sp. hordei) and to provide information for a successful resistance–breeding program in spring barley under Lithuanian conditions. The experiment was conducted at the Institute of Agriculture of the Lithuanian Research Centre for Agriculture and Forestry. The effectiveness of different methods of artificial inoculation was also tested. About 50 varieties with net blotch resistance level ranging from resistant/moderately resistant to susceptible were chosen for agro-biological trait evaluation. Increased net blotch infection had a negative impact on ear length, number of spikelets and number of grains in the ear in 2007. No significant effects on these traits were found in 2009, but increased net blotch level caused significantly lower grain weight per ear. Artificial inoculation using chopped straw of susceptible varieties is more likely to give desirable effects on infection level. The varieties ‘Luokė’, ‘Otis’, ‘Anni’, ‘Landora’, ‘Beatrix’ possessed the highest resistance to net blotch, and the varieties ‘Marnie’ and ‘Isotta’ exhibited good resistance to powdery mildew. The variety ‘Acrobat’ was resistant to both diseases.

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492-497 R. Skuodienė and R. Nekrošienė
Effect of perennial grasses ploughed in as green manure on the occurence of net blotch in spring barley
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Effect of perennial grasses ploughed in as green manure on the occurence of net blotch in spring barley

R. Skuodienė¹ and R. Nekrošienė²

¹Lithuanian Institute of Agriculture, Vėžaičiai Branch, Gargždų 29, LT–96216 Klaipėda distr.,Lithuania; tel: + 370 46 458233; e-mail: rskuod@vezaiciai.lzi.lt
²Botanical Garden of Klaipėda University, Kretingos 92, LT–92327 Klaipėda, Lithuania;e-mail: rita_nekrosiene@mail.ru

Abstract:

Experiments were carried out in the Vėžaičiai Branch of the Lithuanian Institute of Agriculture (West Lithuania) in 2005–2007. The aim of this research was to assess the impact of using perennial legumes (red and white clover, lucerne) and timothy as green manure in crop rotation on the occurence of net blotch disease (causal agent Drechslera teres (Sacc.) Shoem.) in spring barley. Preceding crops of spring barley were winter triticale and winter rye (perennial grasses were preceding crops of these winter cereals). The yearly occurence of net blotch disease was high: incidence was about 70.00–100.00% severity; at the spring barley booting stage (BBCH 37-39) – from 4.45 to 12.25%, at milk maturity stage (BBCH 73-75) – 43.75–70.95%. The variously-managed perennial grasses in the crop rotation had a significant effect on the occurence of net blotch: the spring barley grown after timothy was 1.1–1.5 times less affected in 2005 and 2007, compared to the spring barley grown after red and white clovers, and about 1.2 times less affected grown after lucerne, compared with spring barley grown after other grasses in 2006.

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