7-10 days depending on the pressure of the disease.
Yes Liquid Copper Fungicide will help prevent peach leaf curl. It must be applied as a dormancy spray at 90% leaf fall and before bud break in the spring.
Yes, both early and late blight can be prevented with use of Liquid Copper Fungicide.
Corn is the only vegetable listed.
At first sign of disease. Follow label for re-app interval.
Keep all pets and people off the lawn until spray has thoroughly dried.