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Spots on the leaf may occur along the veins as well as on the tissue between the veins and on the petioles . The scion is the aboveground part of the tree that produces the type of fruit desired ( for example , ‘ Keepsake ’ or ' Summercrisp ' ) . However , evidence indicates that some pear varieties may be self-fruitful under some conditions , and you might be able to get a small amount of fruit with only one tree . By this we mean that , within a given pixel , the position of radar scatterers has not changed to any significant degree , but the ensemble of scatterers ( i.e ., the entire ground surface within that pixel , as well as some adjacent ones ) has moved up , down , or sideways in some correlated fashion . Some research indicates that the use of oat straw mulch may reduce leafhopper numbers . Birds can eat the entire crop of a small planting if it is not protected . This type of pruning can be delayed until the extent of flowering can be determined .