Peaches and Nectarines Pest and Diseases Management Guide

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For Captan a pH of 5 is considered ideal and gives a half life of 32hrs. At a pH of 7 the half life is 8hrs. You want to measure the pH and adjust it if needed before adding the Captan. See the links in the post below for more details. For backyard use a range of 5-7 would be acceptable in most cases since you will spray right after mixing. It is possible to adjust the pH to be too low which can damage plant tissue. See the links in the post below for more details.

First Enterprise apple

Well bitter rot and scab can be controlled by captan. I have attached a link for a short article on apple scab control from Purdue University. It discusses using captan and other chemicals to control it. Since captan also works on bitter rot it would be a good choice for you. The main disadvantage of captan is it breaks down quickly when you add it to water that has a pH above 7. So in many cases you will need to lower your water’s pH before adding captan. Well water or city water is often…