how do I mix this manzate and what do I mix with it, how offend do I spray with it. I have some mancozeb but it will be gone by July or August and I need some other choses when it is gone. Tried some thing last year was not satisfied with then. I live in a hot and dry area sometime not much rain like now, had no rain in two weeks and there is none in site for week or more
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Mancozeb, Manzate or Dithane are basically the same active ingredient. It is a contact fungicide and is very helpful in controlling blackspot. It is best to premix it in a separate container to ensure it dissolves and not clumps. However, it only persists about 5 days on rose leaves, that is why you should mix it with a systemic fungicide, for example, Myclobutanil, Propiconazole or Tebuconazole. The systemic fungicides are preventative and last 10 to 14 days. Since it has been so dry you should see less black spot, unless you have irrigation that wets your rose leaves. When you water you want the leaves to dry off quickly. Leaves that stay wet for six hours or more create the environmental conditions that will encourage black spot spores to grow.