Florida Agricultural Experiment Station


the invaded area involves from one-third to one-half the surface
the color becomes somewhat darker but the rind remains pliable
and is not easily punctured by pressure of the finger (Fig. 55).
If the fruit is opened the decay will be seen to have advanced
most rapidly along the center, where the segments join, and


4.
* F


Fig. 55.-Late stage of Phomopsis stem-end rot of grapefruit, in which
 the decay has involved more than half the fruit.
along the inner white part of the rind, but not so rapidly in the
juice sacs (Fig. 56).
 The stem-end rot caused by Diplodia starts in much the same
way as that caused by Phomopsis but usually becomes darker,
both externally and internally, and develops more rapidly. When
about one-third to one-half the surface of the fruit is involved
by Diplodia, streaks of decay frequently progress downward in
advance of the main decay (Fig. 57). The decay advances
rapidly through the center of the fruit to the stylar end, where
a patch frequently makes its appearance before all the surface
becomes involved. Diplodia decay may also start in punctures