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All insecticide-treated plots had significantly less (P<0.05) PLH damage on each day
recorded for both the low and high rainfall regimens, as compared with plots that received
no insecticide (Fig. 5). In the insecticide-treated plots that received low rainfall, no
significant differences among the three treatments were recorded. Under the high rainfall
regimen, however, the dinotefuran-treated plots had significantly higher PLH damage on 25
Jun than did plots treated with either imidacloprid or thiamethoxam, and by 7 Jul, plots
treated with thiamethoxam had significantly (P<0.05) less PLH damage than all other
treatments.
35
Venom
Admire
Platinum
Ck
Low rainfall
c
30
b
25
b
20
bc
b
15
b
ab
10
ab
a
a
a
5
a
a
a
0
28-May
2-Jun
7-Jun
12-Jun
17-Jun
22-Jun
27-Jun
30
Venom
Admire
Platinum
Ck
High rainfall
25
bc
b
20
b
b
b
15
b
b
b
ab
ab
10
a
a
a
5
a
a
0
28-May
2-Jun
7-Jun
12-Jun
17-Jun
22-Jun
27-Jun
Figure 4.
Effect of two levels of simulated rainfall on percentage plant defoliation caused by Colorado
potato beetles on potatoes treated with neonicotinoids at planting, Bridgeton, NJ. 2007.
