Some fruit trees are known to overbear and produce too much fruit. Peaches are one, pears are another. One way to reduce overbearing is to crop load thin — either blooms or the fruit just after they start to develop. Early thinning will promote better fruit quality, fruit size, and reduce tree stress. If fruit is thinning late (after fruit starts to size up considerably), much of the benefit of improved size and quality may be lost, but reduced tree stress can still be beneficial. Overcropped trees tend to be stressed and can drop a considerable amount of fruit in order to ripen some of the load. Dropped fruit will rot, creating a haven for disease and insect pests that can re-infect the tree in subsequent seasons. Therefore, sanitation is extremely important. The photos below show an overbearing pear tree and some of the issues involved.