Pine shrub disease

Asked April 26, 2013, 12:15 AM EDT

Could you help me diagnose what is wrong with this pine shrub. I believe it may be a mugho. There are two shrubs, one on each side of the outside porch steps ( a sunny location). They were there when I moved into the house 4 years ago, and they are large and mature. I estimate that 20% of the branches on the one bush have turned brown. The other bush is healthy. Should I prune the brown branches, spray the bush? Can I do anything to save it? Thanks for any advice you can give me. Best, Carole Vail

Centre County Pennsylvania master gardener program plant disease

1 Response

Ms Vail,We have tentatively identified your problem as pine needle scale. It is difficult to accurately identify the problem without seeing a sample of the branch. If at all possible could you bring a sample to the extension office in Bellefonte, 420 Holmes Ave, the old Willowbank building? Please review the attached Penn State website for more information on this problem.http://ento.psu.edu/extension/factsheets/pine-needle-scalehttp://woodypests.cas.psu.edu/FactSheets/InsectFactSheets/html/Pine_Neede_Scale.html
The attached links will give you some recommendations about control of this problem. They recommend pruning and use of a dormant oil in early spring and fall and they also list other control methods for you to use.Again, please bring us a sample for identification. Feel free to either e-mail us at CentreMG@ag.psu.edu or call us at 814-355-4897 during hotline hours. Monday and Wednesday 9-12:00.