Travelers Rest, So
|Within the past 5 day 8 or 12 knockout roses have yellow leaves and they now have dropped of. I have applied the Bayer 3 in 1 systemic product to the affected plants. What is causing the leaves to turn yellow and how to I determine if a fungus is present?
|Answer from NGA
July 16, 2010
|The Bayer 3 in 1 will take care of any insect or fungal diseases but it won't correct a root rot problem. Be sure your roses are not getting too much water which can deplete the soil of oxygen and cause the leaves to yellow. I hope your roses recover!
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