Why black spots on rose bushes? - Knowledgebase Question

San Antonio, TX (Zone 8B)
Avatar for jybarra22
Question by jybarra22
June 24, 2005
The leaves on my rose bushes get black spots on them, then turn yellow and fall off. I water the rose bushes about once a week or less, I have fertilized them, sprayed them for insects but nothing helps. Pretty soon my rose bushes will lose all their leaves and die. Why?

Answer from NGA
June 24, 2005

Black spot fungus of rose is everywhere. If you have roses, you will have some black spot. There are varieties that are resistant and seldom get black spot. When they do it is usually not a significant problem and seldom if ever requires a spray. Cultural conditions can make black spot a rampant problem or a minor nuisance. Overcrowding, poor air circulation, and frequent wetting of the foliage all predispose plants to black spot infection.

Most varieties however, must be sprayed on a regular basis to prevent black spot infections from becoming severe. In severe cases it can even cause defoliation of the plant. There are many fungicide products labeled for black spot on roses. Check with your local Home Depot garden center for available options.

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