Pear rust fungus , also know as pear trellis rust fungus , is a fungus disseminate by wind - gasconade spores . Both juniper and pear trees hurt from this fungal disease , and they spread it wild to each other when the two types of tree diagram are planted close to one another . Pear rusting is most mutual in Europe , on southerly Vancouver Island , in one county in California and in one domain of Washington State . Rust is unmanageable to block off , specially if your vicinity has a lot of junipers and pear Sir Herbert Beerbohm Tree planted near enough to each other that the spores can spread through the air . There are some prophylactic measures you’re able to take , however , to stop pear rust fungus .

Step 1

Determine whether pear rust fungus is indeed your culprit . You should see orange spot covering the leaf in early summer , changing to fuzzed ontogeny in fall . In mid - summer , the orangish spot will prepare bleak spots , and then the spores will produce structures that take fire from the farewell ' small airfoil .

Step 2

Plant juniper tree as far away from your pear trees as possible . verify the junipers and pear Sir Herbert Beerbohm Tree are at least 100 feet apart , as this will forbid the bed cover of rust from the junipers to the pear . The rust fungus will over - winter on juniper tree .

Step 3

hit the nearby infected junipers in early spring to check the spread of the fungus and damage to your pear tree diagram . Be sure to remove from your railyard all part of the tree that you ’ve cut down .

Step 4

Pick off the infected leaf on your Pyrus communis Sir Herbert Beerbohm Tree in the bound and early summertime every yr . This will help to prevent spreading the disease to your neighbour ' Retama raetam .

Step 5

Prune any septic pear tree ofttimes , cutting out any growths at the base of the twig . These growths on severely infected pear tree trees are an unstoppable source of contagion in the tree diagram .

Tip

If you have neighbors nearby , utter with them to find out if they would murder their juniper trees to stop the spread of the rust on the Pyrus communis trees . Chances are if your neighbour are airless enough , they ’re having rusting problems as well . You do n’t need to interest about the disposal of leafage that you take away from an septic tree . After picking the infected farewell , the fungus will simply die after a few days .

Warning

Do n’t get to to employ fungicide sprays on your pear Tree . These spray are not unremarkably efficacious on rusting .