Organophosphates
Pyrethroids
Phenylpyrazol
 
chlorethoxyphos
(Fortress 5G)
chlorpyrifos
(Lorsban 15G & others)
tebupirimphos & cyfluthrin
(Aztec .1G)
terbufos
(Counter CR)
tefluthrin
(Force G3)
fipronil
(Regent 4 SC)

Performance: test plots-
band application

  Root damage rating1,2
  Consistency of performance (%)3



2.8b
83


2.7b
90


2.3a
94


2.1a
95


2.3a
100


n/a
n/a
Performance: test plots - infurrow application
  Root damage rating1,2
  Consistency of performance (%)3


2.7b
92


2.5ab
93


2.3a
92


2.2a
92


2.2a
100


_4
_4

1Average root damage rating (Iowa 1-6 scale) in 12-20 tests over five years, where damage in the untreated plots exceeded 3.5, the damage level above which economic losses are likely to occur. All insecticides had less damage than the untresated plots, which averaged 4.67.
2Values followed by the same letter are not significantly different according to Ryan-Einot-Gabriel-Welsch-Q test (P<0.10).
3Percentage of tests where average damage rating was less than 3.5 when the untreated equaled or exceeded 3.5. Tets from 1993-1999.
4Not enough data are available to rate the perforamnce of this product.