. Auxins and plant growth. Auxin; Plant growth promoting substances. Flower and Fruit Thinning 239 from apples (Southwick and Weeks, 1950). Similarly, it has been found that olives can be thinned with auxins only until natural drop has stopped, and after that auxin sprays have no thinning effect (Hart- mann, 1952). It is known that "June drop" of apples is associated with a low production of auxin (Luckwill, 1953), after which auxin production in the young fruit is relatively high (see figure 103). Many workers have noted that auxin applications selectively thin the fruits on weak or
. Auxins and plant growth. Auxin; Plant growth promoting substances. Flower and Fruit Thinning 239 from apples (Southwick and Weeks, 1950). Similarly, it has been found that olives can be thinned with auxins only until natural drop has stopped, and after that auxin sprays have no thinning effect (Hart- mann, 1952). It is known that "June drop" of apples is associated with a low production of auxin (Luckwill, 1953), after which auxin production in the young fruit is relatively high (see figure 103). Many workers have noted that auxin applications selectively thin the fruits on weak or small spurs preferentially. In fact, even on large, vigorous spurs the peripheral fruits are more susceptible to thinning, and the center or "king" fruits are the most tenaciously held (Batjer and Thompson, 1948). The fruit thinning action of auxin sprays brings about an in- O oc \- z o o u. o UJ o UJ Q. Average fruit weight at harvest. 10 20 30 DAYS TIME OF AUXIN APPLICATION Fig. 102. The differences in fruit weight and in per cent of fruits set on Craw- ley Beauty apples obtained with various times of application after petal-fall of a fruit thinning spray (20 naphthaleneacetic acid) (Luckwill, 1953).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Leopold, A. Carl (Aldo Carl), 1919-. Berkeley, University of California Press
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