My daylilies had rust pretty bad last year, so I was wishing for a very cold winter (won't do that again) to help kill it. I also started using Neem Oil with applications being done on May 4th, May 18th, and May 26th. I was hesitant to apply too often so waited two weeks between the first and second application. Yesterday I saw a little rust and decided to go ahead and put on the third application.
The product says it can be applied every 7 days, and to spray until covered, using 2 Tbsp per gallon of water. I did that with the first application and it took half the bottle before I was done spraying 200 daylilies and about 6 rose bushes.
Would like comments on how others use horticultural oil to control rust on daylilies, or even on other plants (I used it on my roses too). Am I using it too often? Too liberally? Can it actually do more harm than good to my daylilies? Should I be using something else?
This is only May and I remember that the rust really looked bad by the end of July, so I really want to be proactive and thwart any rust before it takes hold again.
