Agricultural crops :: Cereals :: Maize
Brown stripe downy mildew: Scleropthora rayssiae var. zeae
Symptoms
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Lesions start developing on lower leaves as narrow chlorosis or yellow stripes,3-7 mm wide, with well defined margin and are delimited by the veins.
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The stripes later become reddish to purple. Lateral development of lesions causes sever striping and blotching.
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Seed development may be suppressed, plant may die prematurely if blotching occurs prior to flowering.
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Sporangia on the leaves appear as a downy whitish to wooly growth on both surface of the lesions.
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Floral or vegetative parts are not malformed, and the leaves do not shred.
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| Management |
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Resistant varieties -Prabhat, Kohinoor, ICI-703, PAC-9401, PMZ-2, SEEDTEC-2331.
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Seed treatment with Acylalanine fungicide metalaxyl @ 6.0 g/kg.
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Rogue out infected plants at early stage.
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Control - Apron 35 WP, @ 2.5 g/kg as seed treatment.
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Spray with Metalaxyl 1g/lit or Metalaxyl + Mancozeb @ 2.5 g/lit.
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