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Table 2. Dose-mortality biossays of codling moth eggs using neonicotinyl and insect growth regulator insecticides, 2001-2004.
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
Codling moth eggs (topical exposure)
Acetamiprid 70WP
2004
1476
45
1.3 (0.1)
0.5 (0.3-0.7)
99.4
89.2
Thiacloprid 480 SC
2002
597
75
1.4 (0.1)
2.0 (0.6-4.0)
98.5
78.1
Clothianidin 50WP
2004
1457
56
2.0 (0.1)
27.1 (15.1-41.1)
72.1
7.9
Methoxyfenozide 2F
2002
596
75
1.6 (0.1)
0.4 (0.1-0.8)
100.0
97.9
Difluorobenzamide 0.83EC
2004
1547
78
1.0 (0.04)
0.2 (0.1-0.3)
99.6
94.8
Codling moth eggs (residual exposure)
Acetamiprid 70WP
2001
758
45
0.8 (0.04)
34.9 (7.9-207.4)
53.3
23.7
Thiacloprid 480 SC
2004
1192
75
0.9 (0.1)
281.0 (145.2-3765.5)
33.3
9.1
Clothianidin 50WP
2004
1780
56
0.7 (0.03)
62.3 (31.2-185.5)
49.4
23.7
Methoxyfenozide 2F
2001
995
75
1.0 (0.04)
0.9 (0.1-2.2)
97.3
82.3
Difluorobenzamide 0.83EC
2004
1470
78
2.4 (0.1)
7.0 (5.2-8.8)
99.4
53.6
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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