Apple and Pear Trees need Help! #737499 - Ask Extension


Apple and Pear Trees need Help! #737499

Asked January 27, 2021, 7:00 PM EST

HI- I have a few apple and pear trees that showed signs of disease last year. Copper Sulfate spray has been recommended but I am not sure of when and how often to spray the trees. I was also told to add oil to the spray but I have no idea as to what type of oil and if I add it directly with the copper sulfate.
Thank you in advance for your help in this matter.

Jackson County Oregon

Expert Response

The best way to manage diseases and insects in your orchard is to combine methods. Along with using pesticides, there are cultural and biological practices also that can help prevent or manage diseases and insects. Pesticide timing and thorough spray coverage are the keys to good pest management. For good coverage, wet the leaves, twigs, and branches thoroughly. (Note: This can be difficult with hand sprayers.) When you use wettable powders, be sure to shake or stir the spray mix often during application because the powders tend to settle at the bottom of the spray container after mixing.

To avoid excess chemical residues, be sure to use the correct rate and proper interval between the last spray and harvest.

Here is a terrific publication to help you:


chris Rusch Replied January 28, 2021, 12:51 AM EST

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