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How to Stop Rust on a Pear Tree

How to Stop Rust on a Pear Tree


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Pear rust, also known as pear trellis rust, is a fungus spread by wind-blown spores. Pear rust is most common in Europe, on southern Vancouver Island, in one county in California and in one area of Washington State. Rust is difficult to stop, especially if your neighborhood has a lot of junipers and pear trees planted close enough to each other that the spores can spread through the air. There are some preventive measures you can take, however, to stop pear rust.

Determine whether pear rust is indeed your culprit. You should see orange spots covering the leaves in early summer, changing to fuzzy growth in autumn. In mid-summer, the orange spots will develop black spots, and then the spores will produce structures that erupt from the leaves’ lower surfaces.

  • Pear rust, also known as pear trellis rust, is a fungus spread by wind-blown spores.
  • In mid-summer, the orange spots will develop black spots, and then the spores will produce structures that erupt from the leaves’ lower surfaces.

Plant juniper trees as far away from your pear trees as possible. Make sure the junipers and pear trees are at least 100 feet apart, as this will prevent the spread of rust from the junipers to the pears. The rust fungus will over-winter on juniper trees.

Remove the nearby infected junipers in early spring to contain the spread of the fungus and damage to your pear trees. Be sure to remove from your yard all parts of the tree that you’ve cut down.

Pick off the infected leaves on your pear tree in the spring and early summer every year. This will help to prevent spreading the disease to your neighbors’ junipers.

  • Plant juniper trees as far away from your pear trees as possible.
  • Remove the nearby infected junipers in early spring to contain the spread of the fungus and damage to your pear trees.

Prune any infected pear trees frequently, cutting out any growths at the base of the twigs. These growths on severely infected pear trees are an unstoppable source of infection in the tree.

If you have neighbors nearby, talk with them to find out if they would remove their juniper trees to stop the spread of the rust on the pear trees. Chances are if your neighbors are close enough, they’re having rust problems as well.

You don’t need to worry about the disposal of leaves that you remove from an infected tree. After picking the infected leaves, the fungus will simply die after a few days.

Don’t bother to use fungicide sprays on your pear trees. These sprays are not usually effective on rust.


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