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Reason

Reason® fungicide provides disease protection in many crops including potatoes, bulb vegetables, brassica leafy vegetables, carrots, cucurbits, spinach, tomato and turnip green. When applied in a foliar application and mixed with a contact fungicide like Dithane DG or Bravo® 500, Reason provides early and late blight protection in potatoes and tomatoes, downy mildew control in many vegetables and cavity spot control for carrots. Its local systemic activity protects new growth and its translaminar movement protects both sides of the leaf.

Reason can also be used as a potato seed-piece treatment when seed-borne late blight is a threat. Applied as is or in a tank-mix, it gives you the highest level of disease and insect protection available from a seed-piece treatment program.

Product Summary

Fungicide

Product Type

  • Fungicide
Crops

Crops

Diseases Controlled

Diseases Controlled (Top 3)

Diseases Supressed

Diseases Suppressed (Top 3)

  • Downy Mildew
  • Cottony Leak
  • Phytophthora Blight
Groups and Active Ingredients

Groups and Active Ingredients

  • Fenamidone Group 11
Formulation Type

Formulation Type

  • 500 g/L liquid flowable
Packaging

Packaging

  • Available in 2 L jugs

Active Ingredients

Fenamidone

Crops

Bok Choy
Broccoli
Brussel Sprouts
Cabbage
Carrot
Cauliflower
Cucumber
Cucurbits
Garlic
Ginseng
Kale
Melon
Mustard greens
Onions
Potatoes
Pumpkin
Squash
Spinach
Tomato
Turnip green

Diseases Controlled

Cottony leak
Downy mildew
Early blight
Late blight
Phytophthora blight
Seed-borne late blight

Diseases Suppressed

Downy Mildew
Cottony Leak
Phytophthora Blight

Registered Tank Mixes

In potatoes and tomatoes always tank mix Reason with a contact fungicide.

Province of Registration

Alberta
British Columbia
Manitoba
New Brunswick
Newfoundland
Northwest Territories
Nova Scotia
Nunavut
Ontario
Prince Edward Island
Quebec
Saskatchewan
Yukon

Overview



  • Group 11 fungicide
  • Locally systemic activity to protect new growth
  • Translaminar movement to protect both sides of the leaf
  • Strong anti-sporulant activity
  • Concentrated flowable formulation reduces amount of product to handle
  • An economical way to add the above benefits to your contact spray program in potatoes and tomatoes

Application Tips



  • Rainfast in 1 to 2 hours
  • Begin applications as soon as conditions become favourable for disease development
  • Applications should be made 8-14 days apart for ginseng and 5-10 days apart for all other crops
  • Reason needs to be tank-mixed with a contact spray for foliar applications in tomato and potato crops
  • To limit the possibility of fungicide resistance, Reason (or any other Group 11 fungicide) should be used on alternate applications

 

 

Crops Diseases Method of Treatment Rates Pre-harvest intervals (days) Max Applications
Bulb vegetables
(Crop group 3)
Downy mildew
(suppression)
Foliar,
ground application
400 mL/ha
(162 mL/ac.)
7 4
Brassica leafy vegetables
(Crop group 5)
400-600 mL/ha
(162-243 mL/ac.)
2 3
Carrots Damping off
Cavity spot/pythium
600 mL/ha
(243 mL/ac.)
14 2
Cucurbit vegetables
(Crop group 9)
Downy mildew 400 mL/ha
(162 mL/ac.)
4
Edible-podded beans
(Crop subgroup 6A)
Cottony leak (pythium),
Phytophthora blight
(suppression)
600 mL/ha
(243 mL/ac.)
3 3
Ginseng Phytophthora blight
and root rot
14
Spinach Downy mildew
(suppression)
400 mL/ha
(162 mL/ac.)
2 4
Succulent beans
(except succulent shelled cowpeas)
(Crop subgroup 6B)
Cottony leak (pythium),
Phytophthora blight
(suppression)
600 mL/ha
(243 mL/ac.)
3 3
Tomatoes Late blight
Early blight
200 mL/ha
(81 mL/ac.)
plus 1.25 kg/ha
(0.5 kg/ac.) of Dithane DG* or Bravo® 500 at registered rates
14 6
Turnip greens Downy mildew 400-600 mL/ha
(162-243 mL/ac.)
2 2
Potatoes Late blight
Early blight
200 mL/ha
(81 mL/ac.)
plus 1.25 kg/ha
(0.5 kg/ac.) of Dithane DG* or Bravo® 500 at registered rates
14 6
Seed-borne late blight Seed-piece treatment 10 mL/100 kg seed
(4.5 mL/cwt seed)
N/A N/A

* For other mancozeb products (Manzate®, Penncozeb®) use equivalent rates (935g ai/ha).

 

Alternate with fungicides having a different mode of action other than Group 11 every 7 to 10 days after each application of Reason fungicide.

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