Further, by clicking the "Show
Accumulation" link in the pop-up, we
can see the pattern of heat accumu-
lation (Figure 3) at the site so far in
2018 (in blue) and on average (black
line). This plot indicates that the 500
GDD threshold at which management
should commence is normally reached
in Charlotte, North Carolina on April
30. However, the region experienced
a very warm spell in late February,
and as of March 2, heat accumulation
for this location was 29 days ahead
of schedule (difference from normal
shown by red line). A tree care special-
ist in the region might use this infor-
mation to anticipate an earlier start
to lilac borer emergence—and might
schedule treatments accordingly.
Figure 3: Pattern of heat accumulation
for Charlotte, North Carolina as
discussed in text.
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16 CityTREES
