Management of Downy Mildew in Onions

Management of Downy Mildew in Onions:-

Symptoms:-

  • Violet colour fungus on the surface of leaves or flower stalk, which later becomes pale greenish yellow colour.
  • Finally, the leaves or seed stalks collapses.
  • The disease is worst in damp condition, late planting and application of higher doses of fertilizer and numerous irrigation.

Control

  • Onion bulb used for seed crop should be exposed to sunlight for 12 days to destroy the fungus.
  • Spray with Mancozeb + Metalxyl or Carbendazim + Mancozeb @ 400 Gm/Acre at fort night interval.

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How to Control Downy Mildew in Cauliflower

  • Proper water management so that there is no excess moisture on the soil surface.
  • Saaf (Carbendazim 12% + Mancozeb 63% WP) @ 300-400 gm/acre or
  • Ridomil gold (Metalaxyl 4%+ Mancozeb 64% WP) @ 300-400 gm/acre.
  • Amistar (Azoxystrobin 23%Sc) @ 200 ml/acre.
  • Netivo (Tebuconazole50%+Trifloxystrobin 25%WG) can be sprayed @120 gm/acre.
  • Follow the crop cycle and keep the field clean.

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How to Control Downy Mildew in Cauliflower

  • Proper water management so that there is no excess moisture on the soil surface.
  • Saaf (Carbendazim 12% + Mancozeb 63% WP) @ 300-400 gm/acre or
  • Ridomil gold (Metalaxyl 4%+ Mancozeb 64% WP) @ 300-400 gm/acre.
  • Amistar (Azoxystrobin 23%Sc) @ 200 ml/acre.
  • Netivo (Tebuconazole50%+Trifloxystrobin 25%WG) can be sprayed @120 gm/acre.
  • Follow the crop cycle and keep the field clean.

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What’re the Symptoms of Downy Mildew in Cauliflower

  • The stem shows dark brown, depressed lesions which later develop downy growth of the fungus.
  • On leaves, purplish-brown spots appear on the under surface followed by the appearance of downy growth on such lesions.
  • It causes damage to curd, producing curd-rot.

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Control of downy mildew in bottle gourd

  • Water soaked lesions appear on under surface of leaf lamina.
  • Angular spots appear on upper surface similar to water-soaked lesions.
  • Lesions appear first on the older croton leaves and progressively on the younger leaves.
  • As the lesions expand, they may remain yellow or become dry and brown.
  • Affected vines do not set fruit properly.
  • Plucking and destroy of affected leaves.
  • Use resistant cultivars.
  • Crop rotation and sanitation reduces the severity of the disease.
  • Spray with Mancozeb 75% WP @ 350-400 gm/acre or Chlorothalonil 75% WP @ 200-250 gm/ acre.

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Downy mildew control in muskmelon

  • Water soaked lesions appear on undersurface of leaf lamina.
  • Angular spots appear on upper surface similar to water-soaked lesions.
  • Lesions appear first on the older leaves and progressively on the younger leaves.
  • As the lesions expand, they may remain yellow or become dry and brown.
  • Affected vines do not set fruit properly.
  • Plucking and destroy of affected leaves.
  • Spray with Mancozeb 75% WP @ 350-400 gm/acre or Chlorothalonil 75% WP @ 200-250 gm/ acre.
  • Crop rotation and sanitation reduces the severity of the disease.

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Downy mildew control in watermelon

  • Water soaked lesions appear on undersurface of leaf lamina.
  • Angular spots appear on upper surface similar to water-soaked lesions.
  • Lesions appear first on the older leaves and progressively on the younger leaves.
  • As the lesions expand, they may remain yellow or become dry and brown.
  • Affected vines do not set fruit properly.
  • Plucking and destroy of affected leaves.
  • Spray with Mancozeb 75% WP @ 350-400 gm/acre or Chlorothalonil 75% WP @ 200-250 gm/ acre.
  • Crop rotation and sanitation reduces the severity of the disease.

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Control of downy mildew in Snake gourd

  • During wet season, corresponding lower surface is covered with faint purplish fungal growth.
  • The entire leaf dries up quickly.
  • Use of bed system with wide spacing with good drainage and air movement and exposure to sun help to check the disease development.
  • Spray with Mancozeb 75% WP @ 350-400 gm/acre or Chlorothalonil 75% WP @ 200-250 gm/ acre.

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Control Of Downy Mildew in Cauliflower

Control Of Downy Mildew in Cauliflower:-

  • The stem shows dark brown, depressed lesions which later develop downy growth of the fungus.
  • On leaves, purplish-brown spots appear on the under surface followed by appearance of downy growth on such lesions.
  • It causes damage to curd, producing curd-rot.

Control:-

  • Give hot water treatment to seed at 50°C for 30 min with Thiram(0.3%).
  • Remove the diseased portions of the curd and apply copper oxychloride 50% WP @ 3 Gm/ litre to the cut surface.
  • Spray the crop with Mancozeb 75% WP@ 400 Gm/Acre at 10-15 days intervals, first spray be given on the appearance of symptoms.
  • Follow crop rotation and sanitation practices.

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Downy Mildew in Cucurbitaceae

Downy Mildew in Cucurbitaceae

Symptoms:-

  • Water soaked lesions appears on under surface of leaf lamina.
  • Angular spots appear on upper surface similar to water soaked lesions.
  • Lesions appear first on the older leaves and progressive on the younger leaves.
  • As the lesions expand, they may remain yellow or become dry and brown.
  • Affected vines do not set fruit properly.

Control:-

  • Plucking and destroy of affected leaves.
  • Use resistant cultivars.
  • Spray Mancozeb 3 Gm/litre on under surface of leaves.
  • Crop rotation and sanitation reduces the severity of the disease.

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