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Table 1. Dose-mortality bioassays of neonate larvae of various lepidopteran species using neonicotinyl and standard insecticides, 1999-2003.
Insecticide
Year
No.
individuals
MFR
mg AI/liter
Slope (SE)a
LC 50
Toxicity Index
Estimated mortality (%) at proportion of maximum field rate
Estimated value
mg AI/liter (95% CI)
1 ´ MFR
0.1 ´ MFR
Pandemis pyrusana larvae
Acetamiprid 70WP
2001
400
45
1.4 (0.4)
410.5 (245.7-1627.4)
7.56
0.23
Thiacloprid 480SC
2001
400
75
3.0 (0.9)
58.6 (23.9-81.0)
62.37
0.36
Clothianidin 50WP
2003
350
56
2.9 (0.7)
186.0 (127.7-251.8)
7.07
0.00
Spinosad 2SC
2001
400
46
3.0 (0.8)
0.4 (0.2-0.6)
99.98
96.76
Obliquebanded leafroller larvae
Acetamiprid 70WP
2001
400
45
1.8 (0.4)
107.6 (67.2-154.6)
22.84
0.55
Thiacloprid 480SC
2001
400
75
4.1 (0.7)
56.6 (43.0-70.2)
69.77
0.02
Clothianidin 50WP
2003
350
56
2.1 (0.4)
75.0 (45.1-109.1)
42.12
1.08
Spinosad 2SC
2001
400
46
4.8 (1.0)
0.5 (0.3-0.6)
100.00
100.00
Lacanobia subjuncta larvae
Acetamiprid 70WP
2000
400
45
3.0 (0.6)
71.3 (46.8-100.3)
26.10
0.0136
Thiacloprid 480SC
2000
400
75
3.9 (1.1)
110.3 (62.5-149.5)
28.53
0.0004
Spinosad 2SC
2000
400
46
2.4 (0.6)
1.6 (0.9-2.5)
99.97
85.5568
Codling moth larvae (no. entries)
Acetamiprid 70WP
1999
600
45
2.0 (0.4)
3.1 (1.4-5.1)
99.0
62.42
Thiacloprid 480SC
1999
600
75
1.2 (0.2)
3.5 (0.7-8.7)
94.3
64.81
Clothianidin 50WP
2003
700
56
1.2 (0.2)
2.4 (0.2-6.7)
95.1
67.65
Azinphosmethyl 50WP
1999
600
449
2.4 (0.5)
6.9 (3.0-10.1)
100.0
97.64
a A 't' ratio test on the slope parameter of each probit line was conducted and in each case was greater then 1.96 indicating a linear fit for the data.
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