Fitopatologia Brasileira (2005) 30, 139-142

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Ana P. Menegon, Carlos A. Forcelini and José M.C. Fernandes (2005)
Expansão de lesão da mancha-reticular da cevada e sua interação com o tratamento de sementes
[Lesion expansion of barley net blotch and its interaction with seed treatment]
Fitopatologia Brasileira 30 (2), 139-142
Abstract: Field experiments were carried out at the FAMV/UPF, in 2002, to evaluate whether seed treatment with fungicides was able to influence the process of lesion expansion by barley (Hordeum vulgare) net blotch. Barley seeds of the cultivars BR 2 and MN 698 were treated with triadimenol at 40 g i.a./100 kg seeds. The seed treatment was combined with single or double sprays of a triazol fungicide (tebuconazole), or a triazol + strobyrulin (epoxiconazole + pyraclostrobin), at different plant growth stages. Lesion size and disease severity were assessed at 62, 79, 88, 95, 103, and 111 days after planting. The use of seeds with a low incidence of infection, seeds treated with fungicide, and foliar sprays significantly reduced the process of lesion expansion. The number of sprays, wheter one or two, and the type of fungicide did not influence lesion expansion. The severity of net blotch was low, especially under seed treatment, which reduced the process of lesion expansion, an important component of barley leaf spot epidemics.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Portuguese)
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Research topic(s) for pests/diseases/weeds:
control - general
transmission/dispersal of plant diseases

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Pyrenophora teres Barley (Hordeum vulgare) Brazil (south)