. Bulletin . runed trees there weremore apples that passed the color requirement than from the un-pruned trees. 12 Pruning Aids in Controlling Pests and Diseases.—Better con-trol of fruit pests is another result that can be obtained fromproper pruning. Where the branches are thick and matted it isalmost impossible to apply a thorough coating of spray result is poor controlof pests. Dense growthincreases humidity inthe tree, allowing mostfungi to thrive. Pruning secures goodpenetration of light andcirculation of air throughthe branches, decreasinghumidity so that fungido not thrive
. Bulletin . runed trees there weremore apples that passed the color requirement than from the un-pruned trees. 12 Pruning Aids in Controlling Pests and Diseases.—Better con-trol of fruit pests is another result that can be obtained fromproper pruning. Where the branches are thick and matted it isalmost impossible to apply a thorough coating of spray result is poor controlof pests. Dense growthincreases humidity inthe tree, allowing mostfungi to thrive. Pruning secures goodpenetration of light andcirculation of air throughthe branches, decreasinghumidity so that fungido not thrive as fact is especiallytrue with regard to theapple scab fungus, whichgerminates in wet weath-er very easily. Thick,dense, humid places donot dry out, and so pre-sent ideal conditions fordisease development. If all cankers are re-moved, diseases likeblght can usually bekept under control. Thisdisease winters over asa canker on large out the cankershelps to keep the diseasein Fig. 7.—A stub left in pruning will not heal. Noticethe healfcd cuts on the right limb. They were all madeclose and smooth. (Courtesy United States Depart-ment of Agriculture.) Example. — An illus-tration of the benefits ofpruning as an aid tospraying can be seen inresults from the AppleBlotch Control Demon-strations that were staged in southwestern Ohio by the Ex-tension Service. The report of results from these demonstrationssays, The trees in the demonstration plot of the Perria orchard 13 were sprayed with considerable difficulty owing to their lack ofproper pruning. The fruiting branches had matted together, mak-ing it tedious and difficult to give thorough spraying. This condi-tion also necessitated the use of an excessive amount of spraymaterial. The spraying could have been given in half the time hadthe trees been properly thinned out by judicious pruning before-hand. Pruning Increases the Size of Fruit.—Some trees like the peachsometimes set such a heavy cr
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