If you're interested in pear diseases and how to treat them, photos of diseased trees and our descriptions will help you understand the problems with your pears and how to treat them. Of course, it's best to try to prevent diseases, or at least recognize them early, so treatments are more effective. If this process is allowed to progress, the trees are often beyond saving. Furthermore, young and weak trees can be just as susceptible to disease as older ones.
See also: Blackcurrant pests and their control (photo).
Non-infectious diseases of pear
These diseases often arise due to improper care, inadequate nutrition, temperature fluctuations, sun and frost burn, unsuitable soil, and unsuitable site conditions. Insufficient soil nutrition can lead to leaf drop, deformed fruit, meager yields, and so on. To prevent this, fertilize the soil and apply fertilizers, both by watering and spraying.
Pears often suffer from severe frosts (above 27 degrees Celsius). Sunburn and frost burn can cause the bark to split, which then turns black and dies, allowing parasites to infest the area, and the tree begins to die. Damaged areas should be identified promptly, cut out with a few centimeters of extra space, and sealed with garden pitch.
In the fall, be sure to whitewash the trees using copper sulfate and lime, adding clay, mullein, laundry soap, glue, and Epin. These diseases are not contagious to other trees, so by taking timely measures, you will protect your pear trees, and they will delight you with a bountiful harvest.
Infectious diseases
These are more dangerous problems that are easier to prevent than to treat later, especially if the diseases are advanced. All sorts of sucking insects, plus the wind, spread the infection throughout the orchard, and then it will be difficult to stop an epidemic that will poison all the trees and destroy the orchard. So let's look at the infections that affect pears and try to prevent them. And if it's too late, treat them.
To spend less time on the site, read: growwise-en.techinfus.com, and you will have a lot of free time for other concerns.
Scab on a pear tree - how to fight it?
A common, insidious and dangerous disease caused by certain fungi. It can be caused by cool weather, prolonged rainfall, and excessive humidity, which favors the development of various types of fungi. Scab also spreads quickly from trees to other trees if they are planted too closely. Leaves turn brown, fruits darken and crack, flowers are damaged, and yield declines.
How to combat: destroy affected branches and treat the trees with fungicides. In the fall, carefully collect all leaves and burn them, including the affected parts of the tree. In the spring, treat the trees with a 7% urea solution, and also use Bordeaux mixture as a preventative measure on the branches and surrounding soil. Ideally, when purchasing seedlings, choose varieties resistant to this pest, to avoid the hassle of treating the pears later.
Fruit rot
If your pears are producing rotten, unappetizing fruit instead of juicy and delicious, you've got Maniliosis. The pears become covered in brown spots and don't fall off the branches, spreading the disease further.
How to stop the process: remove all affected fruit from branches and the ground, burn them, and treat the trees with Bordeaux mixture. Repeat in the spring.
Stem rot
Cytosporosis, also known as "stem rot," often attacks weakened trees, causing red-brown ulcers to appear, branches to dry out, bark to die, and this can even kill the tree.
How to combat: Remove affected branches. Burn them, cut out the affected bark, treat the wounds first with copper sulfate, then seal them with pitch. In the fall, whitewash the trees, spray with Bordeaux mixture, and then repeat the process in the spring.
Black crayfish
If you notice red spots on your trees, it could be a sign of this insidious disease, also known as St. Anthony's Fire. This disease also causes black rot. Fruit becomes deformed and dry out, and the spots on the bark progress. To prevent the infection from spreading to other trees, it's essential to burn fallen leaves, trim away damaged bark, and fill wounds with copper sulfate or cover them with clay and mullein.
Codling moth and leafhopper
To prevent your fruits from being eaten by this pest, use Agravertin, followed by Kinmiks after three weeks, then after flowering you can treat with Iskra. Burning the leaves in the fall is essential. Spraying with yarrow and chamomile infusions, and Karbofos also helps.
If you feed the trees, remove diseased branches and leaves, destroy them, whitewash and spray the trees, they will reward you with a good harvest and will delight you for many years.

Peculiarities of growing pears from seeds at home
Black spots on pears: causes and treatment methods
How to graft a pear onto an apple tree: step-by-step instructions with photos
Why does a pear tree dry out? Control methods and prevention