Best Time to Apply Fungicides?

[Henlus]

There are other fungicides I know but i've not seen them in nigeria, though they can be imported. They include:
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1. Zampro (contains ametoctradin and dimethomorph)
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2. Previcure flex (propamocarb hcl)
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3. Ranman (cyazofamid)
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4. Gavel 75WG (zoxamide and mancozeb)
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5. Presidio 4FL (fluopicolide)
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6. Tanos (famoxadone and cymoxanil).
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You can use the following fungicide program to combat many diseases that affect cucumber. Apply at 5-7 days interval. When disease appear, apply at 5 days interval:
1. Zampro - (after 5-7 days apply tanos) - (after 5-7 days apply gavel)
2. Ranman - tanos - gavel
3. Presidio - tanos - ranman
4. Presidio - previcure flex - ranman
5. Ranman - tanos - gavel
6. Presidio - tanos - gavel
7. Presidio - gavel - ranman
8. Presidio - previcur flex - zampro.
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For any program u choose to follow, mix each fungicide with Bravo or Mancozeb to prevent resistant strains from developing. For example if you'll follow program 2, do this: mix ranman and bravo or mancozeb and spray. After 5-7 days mix tanos and bravo or mancozeb and spray. After another 5-7 days, mix gavel and bravo or mancozeb and spray. After another 5-7 days, start afresh from ranman and bravo or mancozeb and repeat the cycle.