Senior Member
Posts: 233
Joined: Sun Mar 24, 2013 5:50 pm
Location: northern Michigan

How long between different fungal/ insect treatment?

Hello everyone, I just treated my veggie garden with liquid copper sulfate for fungal deterrent and was wondering how long do I have to wait before I can treat same plants with a organic insecticide like neem oil? I am just using neem oil as a preventative.

Posts: 803
Joined: Fri Jul 25, 2014 11:11 am
Location: Sussex. England

Re: How long between different fungal/ insect treatment?

Neem oil is compatable with most other sprays.......but there are a few that it's best to avoid as a straight mix.
So apply the Neem a couple of hours later to ensure the first chemical has dried. Do not use in strong sunlight to avoid scorch.

Posts: 11231
Joined: Tue Jan 01, 2013 1:32 pm
Location: hawaii, zone 12a 587 ft elev.

Re: How long between different fungal/ insect treatment?

also neem and sulfur are not very compatible with each other. Application sulfur should be separated by one month before or after any oil. When used together, they burn plants. Sulfur is a preventive as well as a very old insecticide. Neem is also good for controlling some insects and as a preventive but does not work well as a control. In reality very few topical fungicides work well as cure. Both are not benign and are toxic to bees and other animals as well as being an eye and skin irritant so read and follow label directions, always. The label will tell you how to apply and how often.
"... But do not use sulfur if you have applied an oil spray within the last month. Sulfur can injure plants if used when
temperatures exceed 80 degrees Fahrenheit."
https://www.bbg.org/gardening/article/l ... t_diseases
https://www.biconet.com/botanicals/infos ... lLabel.pdf
Happy gardening in Hawaii. Gardens are where people grow.

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