Hi Deborah, applying it weekly should be sufficient. Hope that helps and good luck!

Hi Shefali, we get some rust on occasion on our garlic and leeks while also seeing it on some of the grass/weeds on our property. I am surprised copper didn’t work for you but you could also try micronized sulfur, for the copper and sulfur sprays, when you apply the spray may also have a direct correlation on the spray working to control your rust issue. Some need to be used as a preventative versus using it to solve the problem. We have removed plants in the past that just don’t seem to do well in our climate, if a plant consistently gets rust or powdery mildew, we typically decide to move on from it and grow something else. Check out this response to treating the disease for fine line buckthorn, hope that helps and good luck!

Would be great if you could talk about rust in the garden. I have been dealing with it for the past 3-4 years on my Fine Leaf Buckthorn and this year it surfaced on one of the roses. I’ve sprayed with neem oil but it doesn’t seem to work. I’ve also used copper fungicide by Bonide with no luck.

Hi Brenda, it really depends on the type of coreopsis you have as some can be annuals (they only live for one season) while others are perennials (will last for a number of years). Since you are in zone 7, I am sure you will be getting into some colder weather here shortly so if the coreopsis is a perennial, once frost hits, it is recommended to cut the plant back to about 6 inches above ground. Once spring and warmer weather hits, the plant will take off with new growth. Hope that helps and good luck!

Hi Jacqueline, be sure to clean up any leaf or plant debris in your garden to lessen the chances of the mildew staying around. PM is something that has to be managed as chances are, it will just come back the following year, we get PM here in various ways every season no matter what so it is just something we have to manage. We do this by planting PM resistant varieties of vegetables when possible, clean up all extra plant and leaf debris that falls on the garden soil, you can use micronized sulphur mixed with water to treat infected plants, or use potassium bicarbonate which helps but doesn’t work as well as the sulphur. I wouldn’t be concerned with treating your soil specifically, this article by Rodale Institute covers the benefits of planting hairy vetch cover crop for PM suppression of cucurbit vegetables. Hope that helps and good luck!