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Table 5. Effect of acetamiprid (with or without oil) on phytophagous and predatory mite densities, September 2003.
Treatment
g AI/ha
CM cover spraysy
Cumulative mite days
Twospotted spider mitez
European red mite
Total tetranchid mites
G. occidentalis
Z. mali
Total predatory mites
Apple rust mite
Acetamiprid 70WP
167 g
C2
0 d
43 b
43 bc
30 bc
15 abc
45 ab
7,593 a
Acetamiprid 70WPx
167 g
C2
0 cd
72 ab
72 bc
27 cd
15 abc
42 ab
7,975 a
Acetamiprid 70WP
167 g
C1,C2
1 c
69 ab
70 bc
20 de
11 bc
31 b
7,192 a
Acetamiprid 70WPx
167 g
C1,C2
0 d
50 b
50 bc
18 de
30 ab
48 ab
7,871 a
Acetamiprid 70WP
167 g
C1,C2,C3,C4
11 b
148 ab
160 ab
12 e
32 a
44 ab
7,524 a
Acetamiprid 70WPx
167 g
C1,C2,C3,C4
41 a
213 a
254 a
19 de
15 abc
34 b
7,679 a
Phosmet 70WP
3,923 g
[all]
0 d
6 b
6 c
38 b
12 bc
51 ab
6,741 a
Untreated check
-----
-----
0 d
26 b
26 bc
59 a
1 c
60 a
4,754 b
Means within columns not followed by the same letter are significantly different (Waller-Duncan k-ratio t-test).
Experimental design: RCB, 5 replicates (3 rows × 6 trees); sampled 40 leaves/plot; airblast 1,871 liters/ha.
Tetranychid mite species composition (seasonal average): 92% ERM, 8% TSM, 0% MCD.
x Tank mixed with Orchex 796 Horticultural Spray Oil at 1% vol:vol.
y Cover 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), 21, 22 May; C2 (+21 days), 15 June; C3 (1250 DD), 17 July; C4 (+21 days), 7 Aug 2003.
z Data transformed log(y+0.5) due to unequal variances.
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