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Table 4. Field-aged residue bioassays of neonate larvae of various lepidopteran species using neonicotinyl and standard insecticides, 1998-2004.
Rate
(gm AI/ha)b
Year
Corrected % mortality a
1 DAT
4 DAT
7 DAT
14 DAT
21 DAT
28 DAT
Pandemis pyrusana
Acetamiprid 70WP
167
2001
85.1
40.3
39.3
ns c
39.3
sn
4.7
ns
--- d
Thiacloprid 4F
211
2004
65.3
27.6
ns
0.0
ns
0.0
ns
---
---
Clothianidin 50WP
105
2003
15.7
ns
22.4
17.9
ns
8.7
ns
---
---
Spinosad 2SC
105
2004
100.0
100.0
100.0
100.0
89.8
59.1
Obliquebanded leafroller
Acetamiprid 70WP
167
2001
84.2
54.9
72.4
52.1
10.0
ns
---
Thiacloprid 4F
211
2004
90.9
41.5
ns
24.7
ns
0.0
ns
---
---
Clothianidin 50WP
105
2003
36.8
13.1
ns
42.8
ns
15.2
ns
0.0
ns
---
Spinosad 2SC
105
1998
100.0
100.0
100.0
92.6
91.8
61.2
Lacanobia subjuncta
Acetamiprid 70WP
167
2001
17.1
ns
---
---
---
---
---
Codling moth neonates (entries)
Thiacloprid 480 SC
210
2002
98.1
96.8
96.3
95.4
91.0
93.3
Acetamiprid 70WP
167
2002
100.0
100.0
98.8
98.9
97.7
96.6
Acetamiprid 70WP
167
2003
100.0
a
100.0
a
100.0
a
100.0
a
97.2
a
89.5
a
Clothianidin 50WP
210
2003
100.0
a
100.0
a
100.0
a
92.8
a
69.4
b
71.1
a
Azinphosmethyl 50WP
1121
2003
100.0
a
100.0
a
100.0
a
92.9
a
100.0
a
78.9
a
Codling moth ovicide (residual exposure)
Thiacloprid 480 SC
210
2002
81.4
a
89.3
a
61.2
b
44.9
b
70.0
b
50.1
b
Difluorobenzamide 7.5 WG
89
2002
76.9
a
90.1
a
93.5
a
96.6
a
98.8
a
93.0
a
Methoxyfenozide 2F
281
2002
87.9
a
82.5
a
90.4
a
93.6
a
96.2
a
86.6
a
Means within a bioassay in the same year followed by different letters are statistically different (Dunnett's Comparison with Control, P=0.05).
a DAT - Days after treatment application.
b Dilute applications simulating 3,741 liters/ha.
c ns, not significantly different than the untreated control (Dunnett's Comparison with Control, P=0.05).
d ---, test not continued because treatment mortality was not statistically different from untreated control on the previous assessment date.
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