High temperatures also cause chlorosis and burning
(scald) in coffee leaves (Cannell 1985; Wrigley 1988). Ex-
cluding the effect of light, chlorosis caused by high tempe-
ratures in coffee leaves resembles that caused by iron defi-
ciency (Franco 1970). The phenomenon is also a conse-
quence of high temperature and/or water deficits (Da Matta
and Rena 2001). In general, photo-oxidative damage causes
leaf chlorosis that rapidly evolves into tissue necrosis ( Fig.
1) leading to leaf abscission. It is believed that in this case,
the loss of water by transpiration is faster than its reposition
in the local cells. There is fading and the cells tend to die. In
general, these symptoms are visualized on the leaves’ extre-
mities and this type of damage frequently appears in plants
that are shaded and are rapidly exposed to full sunlight and,
consequently, high temperatures. Thus, it is common to ob-
serve this problem in coffee seedlings not adequately adap-
ted prior to be taken to the field (Franco 1970).