Database Reference
In-Depth Information
Empty Days
Monthly Temp Baseline
~
Day Accumulation
Hourly Temp
~
Monthly Temp Amplitude
Convert to Days
Day Adder
Empty
Hours In
Fig. 11.17
through 11.19. Temperature is a large component to determining the development
of the pest, so a temperature model (Figure 11.17) was built based on weather data
from Grandfather Mountain, North Carolina
3
.
Developmental rates of
A. piceae
have been previously modeled in the litera-
ture and are used here between life stages. Developmental rates were previously
calculated in days and driven by temperature. Because of the habitat temperature
fluctuations (altitude effect) this model includes daily temperature variation and
developmental rates in hours. The temperature model thus gives hourly tempera-
ture on a 24-hour daily cycle. Changes in seasons are shown in Table 11.1.
Adelges piceae
has five life stages—egg, adult, and three larval instars—and a
stock are modeled for each stage (Figure 11.18). The adult reaches reproductive age
in three weeks, so a conveyor is constructed for both pre- and reproductive adults.
Development is modeled with flows from each stock, and egg laying is modeled with
an inflow to the egg stock.
Adelges piceae
can overwinter only as first instar larvae,
3
Washington Post. 1997. Weather Post, Grandfather Mountain, NC. http://www.weatherpost. com/
wp-srv/weath...orical/data/grandfather mountain nc.htm
