Climbing rose about 3 yea... - Ask Extension
Climbing rose about 3 years old. Came on strong then this. See Pic.
I have more pictures but your site only accepts one so if you need more just let ...
Knowledgebase
Climbing rose about 3 yea... #130372
Asked May 28, 2013, 5:13 PM EDT
Climbing rose about 3 years old. Came on strong then this. See Pic.
I have more pictures but your site only accepts one so if you need more just let me know. This is the only rose I have so I don't know much about them
Cecil County Maryland
Expert Response
Your climbing rose has both black spot and the leaves are being eaten by an insect called a rose slug. Your one photo was was sufficient for diagnosis. Both of these are common problems on roses and can cause serious damage. For additional information on both go to the 'plant diagnostic' section of our website,
http://plantdiagnostics.umd.edu/level3.cfm?causeID=194
http://plantdiagnostics.umd.edu/level3.cfm?causeID=41
Rose slugs (look like tiny green caterpillars) on the underside of the foliage during the growing season. You can treat with either a systemic insecticide (a once a year application is sufficient) or spray, targeting the underside of the foliage, with an insecticidal soap or horticultural oil. Spinosad is also labeled for control. The problem with the sprays: you can't spray either when the outside temperatures are above 80-85º. An advantage of the systemic is that it gives you season-long control.
Black spot is treated with a fungicide. To reduce the incidence of the black spot becoming resistant to the fungicide you are using alternate between two different kinds. There are many products on the market labeled to control black spot on roses. Roses need to be sprayed pretty much throughout the growing season to control this disease.
dr
http://plantdiagnostics.umd.edu/level3.cfm?causeID=194
http://plantdiagnostics.umd.edu/level3.cfm?causeID=41
Rose slugs (look like tiny green caterpillars) on the underside of the foliage during the growing season. You can treat with either a systemic insecticide (a once a year application is sufficient) or spray, targeting the underside of the foliage, with an insecticidal soap or horticultural oil. Spinosad is also labeled for control. The problem with the sprays: you can't spray either when the outside temperatures are above 80-85º. An advantage of the systemic is that it gives you season-long control.
Black spot is treated with a fungicide. To reduce the incidence of the black spot becoming resistant to the fungicide you are using alternate between two different kinds. There are many products on the market labeled to control black spot on roses. Roses need to be sprayed pretty much throughout the growing season to control this disease.
dr
