The morphological development of apple spurs.pdf

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-6- Moreover, observations hare shown that normal** ly less than ten per oent of the apple biossome which open in the spring produce fruit. Many of the flow* ers are lost a few days after the petals fall, while equally as large a number of the partially developed fruits are thrown off during the next few weeks. An* other conspicuous drop often occurs In June and the early part of July and is usually refered to as the June drop. The failure of a large portion of the apple blossoms to set fruit and the heavy loss of partially developed fruits are frequently associated with poor pollination and the lack of fertilisation. However, many flowers set fruit even though they are poorly pollinated and develop into fruit of good ooomerclal quality. Obviously,ttoere are other factors aside from the destructive agendas as frost, hail, wind and isease, in addition to poor pollination and lack of fertilisation whioh Influence the abscission of flow* ers and partially developed fruits of the apple. Also, there must be faotors which work for or against the development of fruit spurs and flower buds. In the later instance several possible explan-
-7- ations seem readily availahle; the oauae may result from lack of vigor due to the scarcity of available plant foods, conditions of moisture* season, priming methods, etc. Again the enviromental factors alone may not he the stimuli, there is the possibility that structural differences ooour in the fruiting branches muion m turn Influence strongly the development of rlower-budB and the setting of fruit. What ever the factors working together results in fruitfulness or sterility in a tree, the immediate branches upon which the fruit-bud develops and the fruit is borne should throw some light on the problem if carefully studied through their periods of formation and develop ment* This work had such an aim in view and all in* veetigation lias been carried out with the one purpose, the morphological development of apple spurs. mam M j
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The morphological development of apple spurs.pdf

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