Results and Discussion
Insect-Host Plant Relationship
In the first analysis, the set of plant characteristics
was compared with the set of variables representing numbers
of Agasicles and Vogtia present and a measure of Agasicles
feeding damage. As a result of these correlations, 3 new
canonical variates were formed (Table 5 and Table 6). Each
of these new variates was significant at the .01 level of
probability, indicating that 3 independent and significant
linear relationships existed.
If we examine the coefficients of the individual
variables (Table 7), we can explain the combinations of
variables making up each of these associations. The first
canonical variable represents the most important of the
linear associations, and in this case there is a positive
association between plant height, internode length, inter-
mode diameter and the number of Agasicles and Vogtia, and
a negative association between the same plant characteristics
and Agasicles feeding. Therefore, both Vogtia and Agasicles
tend to occur more frequently in alligatorweed with larger,
taller stems. Vogtia, having a larger coefficient, probably
favors these conditions more than Agasicles. The negative
association between the plant characteristics and Agasicles
damage was expected. The more damage done by Agasicles,
the more stress is placed on the growing plants, resulting
in smaller unthrifty stems.