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Table 4. Effect of acetamiprid (with or without oil) on phytophagous and predatory mite densities, September 2002.
Treatment
g AI/ha
CM cover spraysy
Cumulative mite days
Twospotted spider mite
European red mite
Total tetranychid mites
G. occidentalis
Z. mali
Total predatory mites
Apple rust mite
Acetamiprid 70WP
167 g
C2
852 ab
123 ab
975 ab
35 b
118 a
152 a
5,278 a
Acetamiprid 70WPx
167 g
C2
871 ab
208 a
1,079 ab
37 ab
31 ab
68 ab
2,494 a
Acetamiprid 70WP
167 g
C1,C2
1,012 ab
43 ab
1,055 ab
37 ab
94 ab
130 ab
4,944 a
Acetamiprid 70WPx
167 g
C1,C2
541 bcd
144 ab
685 bc
61 a
7 b
69 ab
2,897 a
Acetamiprid 70WP
167 g
C1,C2,C3,C4
1,395 a
79 ab
1,476 a
36 ab
64 ab
100 ab
3,931 a
Acetamiprid 70WPx
167 g
C1,C2,C3,C4
817 abc
172 ab
988 ab
27 b
21 ab
48 b
3,288 a
Phosmet 70WP
3,923 g
[all]
105 d
44 ab
150 c
21 b
42 ab
63 b
7,038 a
Untreated check
---
---
182 cd
25 b
209 c
32 b
32 ab
65 ab
4,629 a
Means within columns not followed by the same letter are significantly different (Waller-Duncan k-ratio t-test).
Experimental design: RCB, 3 replicates, 3 rows × 4 trees; sampled 40 leaves/plot; airblast 935 liters/ha.
Tetranychid mite species composition (seasonal average): 13% ERM, 87% TSM, 0% MCD.
xTank mixed with Orchex 796 Horticultural Spray Oil at 1% vol:vol.
yCover spray in this column refers to acetamiprid; all other cover sprays in that treatment were phosmet; all treatments received 4 cover sprays: C1 (250 DD), 1 June; C2 (+21 days), 21 June; C3 (1250 DD), 20 July; C4 (+21 days), 8 Aug, 2002.
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