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Infection often begins at the site of the flower or bud . For now , however , sanitation ( promptly removing and destroying fallen fruit and leaves ) , cultural practices designed to promote optimum tree health , and perhaps occasional physical or chemical intervention are all that is normally needed to obtain a satisfying crop in most years . Lesion delimitation by the veins should make you suspicious of nematode , however , examination with a 10 hand lens is essential . Rid the proposed planting site of all perennial weeds as they are much more difficult to control after planting . Finally , the polarization combination of the received backscatter is dependent on the polarization of the transmitted microwave power and on the horizontal and / or vertical orientation of the scattering elements present in the vegetation .