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significantly (P<0.01) more toxic to CPB larvae than all other treatments through 7 Jul.
Under the high rainfall regimen, larvae placed on leaves treated with imidacloprid or
thiamethoxam had a significantly (P<0.01) higher mortality on 28 May and 7 Jun than did
larvae placed on leaves treated with dinotefuran or leaves from plants that received no
insecticide; mortality of CPB on leaves treated with thiamethoxam was still significantly
higher than that of CPB larvae on leaves treated with dinotefuran or the leaves that received
no insecticide through the end of Jun (Fig. 1
)
.
CPB larvae placed on leaves from potato plants treated with imidacloprid or thiamethoxam
ate significantly (P<0.01) less leaf tissue than did larvae on potato leaves from plants treated
with dinotefuran or on leaves with no insecticide on each day recorded for both the low and
high rainfall regimen (Fig. 2
).
Leaves from potato plants treated with dinotefuran under the
low rainfall regimen had significantly (P<0.01) less CPB feeding damage as compared with
100
c
b
90
b
Low rainfall
b
b
b
80
b
c
70
60
b
Venom
Admire
Platinum
Ck
50
40
b
30
20
a
a
10
a
a
a
a
a
a
a
0
28-May
7-Jun
17-Jun
27-Jun
7-Jul
100
c
b
High rainfall
b
b
90
b
c
c
b
c
b
80
70
60
Venom
Admire
Platinum
Ck
50
40
a
30
a
20
a
a
a
10
a
a
a
0
28-May
7-Jun
17-Jun
27-Jun
7-Jul
Figure 2.
Effect of two levels of simulated rainfall on percentage leaf tissue eaten by Colorado potato
beetle larvae on potato treated with neonicotinoids in a laboratory bioassay. Bridgeton, NJ 2007.
