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Signs of damage
- Yellow or red spots on the needles after 1 year.
- Elliptical-shaped cankers will appear on branches after 2 years.
- Blisters. After 3 years, white and yellow blisters will appear in springtime.
- Dead branches. Lower branches will perish. Branches above cankers will die as well.
- Trunks develop oval or diamond-shaped cankers.
- Orange and gummy droplets. Cankers develop these in summer.
- Yellow leaf spots.
- Orange spots on the underside of the leaves.
- In late summer to early fall, hair-like structures, orange to brown, will form.
- Stunted growth.
- Falling of leaves during the growing season.
How to prevent
Well-drained soil, aeration between trees, and scouting for blisters and cankers are the primary preventive steps to ensure Pines are less susceptible to this disease. Regular inspections should be done beginning around May.
Preventive pruning is also advised, by removing the lower branches, regardless of symptoms is known to prevent the appearance and spread of these fungi.
Removing Ribes from the area is often employed, but it might not be effective, as these plants regenerate easily and have great survival abilities that make them hard to eradicate.
If lower branches are infected, they can be cut off, stopping the spread of this disease. However, if the trunk is infected, there isn’t any solution, and the tree will eventually die. Fungicides can be employed in late summer, and herbicides too, for Ribes control.
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