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homeguides.sfgate.com/troubleshoot-pear-tree-disease-leaves-53759.html

The good news is that a pear tree (Pyrus communis), sometimes called European pear or common pear, is relatively resistant to insects and disease if you have the right type. The bad news is that ...

www.gardeningknowhow.com/edible/fruits/pear/fixing-pear-tree-problems.htm

If you are just installing pear trees, look for cultivars with some resistance to this disease. Fabraea leaf spot. Other common diseases that damage pear trees include Fabraea leaf spot, caused by the fungus Fabraea maculate. Keep a look out for dark spots on leaves that then yellow and fall. Cankers appear on fruits too, and cause them to crack.

www.gardenfocused.co.uk/fruitarticles/pears/pest.php

Most of the problem areas have pictures to clearly illustrate the damage caused which helps to identify the pest / disease. Feel free to email us using the form at the end of this page or via our contact us page for advice on pear pests and diseases. ... These leaf marks are caused by Pear Leaf Blister Mites. Picture from Ontario Crop IPM.

en.wikipedia.org/wiki/List_of_pear_diseases

List of pear diseases. Jump to navigation Jump to search. The following is a list of diseases of pears (Pyrus communis Bacterial diseases. Bacterial diseases; Crown gall Agrobacterium tumefaciens: Fire blight ... Black rot, leaf spot and canker Botryosphaeria obtusa Sphaeropsis malorum [anamorph]

gardenerdy.com/flowering-pear-tree-diseases

A flowering pear tree is a valuable landscaping tree, and is susceptible to diseases like fire blight and leaf spot. Gardenerdy explains the occurrence of such diseases, and also suggests some preventive measures that can be taken to avoid infections.

www.gardeningknowhow.com/edible/fruits/pear/pear-tree-diseases.htm

Home-grown pears are really a treasure. If you have a pear tree, you know just how sweet and satisfying they can be. Unfortunately that sweetness comes at a price, as pear trees are susceptible to quite a few easily spread diseases that can wipe them right out if left untreated. Keep reading to ...

www.gardenguides.com/96287-diseases-bradford-pear-trees.html

Leaf Spot Disease. In Bradford pear trees, the fungus entomosporium causes leaf spot disease in the fall or spring during or shortly after exceptionally rainy weather. The initial infection causes purple red spots on the leaves. And, as the disease progresses, the spots grow and the leaves turns red and eventually drop.

www.starkbros.com/.../how-to-grow/fruit-trees/pear-trees/pest-and-disease-control

Read about pest & disease control for pear trees in this Stark Bro's Growing Guide article. Cultivate ideas and grow your knowledge.

www.gardenguides.com/90536-ornamental-pear-tree-diseases.html

Both bacterial and fungal diseases can affect ornamental pear trees, causing deformed leaves and blossoms or the die-back of branches. Some diseases may even result in the death of the infected tree. A combination of good cultural practices and chemical treatments will work to prevent and control many diseases.

www.rhs.org.uk/advice/profile?pid=236

Pear rust is a disease caused by the rust fungus Gymnosporangium sabinae, which causes bright orange spots on the upper surfaces of pear leaves in summer and early autumn. This fungus attacks both pears and junipers. In fact it needs both plants in order to complete its life cycle.