3.2. Effect of seed treatment on plant height and plant density
In 2010, limited evidence was found for differences in plant
heights among treatments (Table 3). Heights were marginally lower
(P ¼ 0.054) in untreated cuts than in cuts treated with chlorantraniliprole
or thiamethoxam (Table 3). In 2011, seed treatments
had small but significant (P < 0.05) effects on plant height. Plants
were generally taller in cuts treated with thiamethoxam or clothianidin
than in untreated or chlorantraniliprole-treated plots. No
differences in plant heights were detected among untreated and
chlorantraniliprole treated plots (Table 3).
In 2010, no significant differences in stand counts were found
among treatments (Table 3). In 2011, seed treatments had a
marginally significant effect on stand counts (P ¼ 0.06). In both
years, there was a trend toward higher stand counts in cuts treated
with neonicotinoids than in untreated cuts or cuts treated with
chlorantraniliprole (Table 3).