Back One Page
Table 7. Effect of acetamiprid (with or without oil) on phytophagous and predatory mite densities, commercial orchard, September 2003.
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
8 ab
0 a
8 ab
14 a
0.0 a
14 a
1,301 ab
Acetamiprid 70WPx
167 g
C2
6 ab
3 a
9 ab
18 a
0.1 a
18 a
1,706 ab
Acetamiprid 70WP
167 g
C1,C2
8 ab
8a
16 ab
20 a
0.1 a
20 a
1,414 ab
Acetamiprid 70WPx
167 g
C1,C2
4 ab
1 a
4 ab
14 a
0.1 a
14 a
1,275 b
Acetamiprid 70WP
167 g
C1,C2,C3,C4
8 ab
2 a
10 ab
7 a
0.0 a
7 a
1,820 a
Acetamiprid 70WPx
167 g
C1,C2,C3,C4
15 a
5 a
20 a
20 a
0.1 a
20 a
1,605 ab
Imidan 70WP
3,923 g
[all]
2 b
6 a
9 ab
16 a
0.1 a
16 a
1,389 ab
Untreated check
-----
-----
4 ab
1 a
5 b
12 a
0.1 a
12 a
1,569 ab
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 × 9 trees); sampled 60 leaves/plot; airblast 935 liters/ha.
Tetranychid mite species composition (seasonal average): 26% ERM, 71% TSM, 3% 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), 20 May; C2 (+21 days), 23 June; C3 (1250 DD), 18 July; C4 (+21 days), 9 Aug 2003.
Back One Page