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Table 3. Effect of neonicotinyl insecticides on phytophagous and predatory mites, Aug 2001.
Compound
g AI/ha
CM cover spraysx
Cumulative mite days
Twospotted spider mitey
European red mitey
Total tetranychid mitesy
G. occidentalisy
Z. mali
Total predatory mitesy
Apple rust mite
Acetamiprid 70WP
167 g
C1,C2,C3,C4
93 a
136 a
234 a
15 c
14 cd
29 b
33,650 a
Thiacloprid 480SC
140 g
C1,C2,C3,C4
23 bc
38 bc
62 bc
60 ab
12 cd
72 a
20,916 bc
Thiamethoxam 25WDG
96 g
C1,C2,C3,C4
9 cd
18 bc
30 bc
55 ab
43 ab
99 a
18,008 c
Imidacloprid 1.6F
112 g
C1,C2,C3,C4
6 de
17 cd
25 cd
33 bc
68 a
101 a
23,532 abc
Acetamiprid 70WP
168 g
C1,C2
20 b
32 b
53 b
16 c
14 cd
30 b
28,981 ab
Esfenvalerate 0.66EC
84 g
C1,C2,C3,C4
9 cd
8 bcd
17 cd
17 c
2 d
19 b
26,376 abc
Phosmet 70WP
4,182 g
[all]
1 e
2 d
4 d
57 ab
30 bc
86 a
20,200 bc
Check
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3 de
4 d
8 d
85 a
21 bcd
105 a
22,035 bc
Means within columns not followed by the same letter are significantly different (Waller-Duncan k-ratio t-test).
Experimental design: RCB, 4 replicates, 5 tree (single row); sampled 20 leaves/plot; airblast 1,871 liters/ha.
Tetranychid mite species composition (seasonal average): 59% ERM, 38% TSM, 3% MCD.
x Cover spray in this column refers to acetamiprid; all other cover sprays in that treatment were phosmet; all treatments received four cover sprays: 1st cover, 24 May; 2nd cover 28 June; 3rd cover 19 July, 4th cover 9 Aug, 2001.
y Data transformed log(y+0.5) due to unequal variances.
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