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Table 6. Effect of acetamiprid (with or without oil) on phytophagous and predatory mite densities, commercial orchard, 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
C1,C2
7 a
1 a
8 a
35 a
49 a
84 a
5 a
Acetamiprid 70WPx
167 g
C1,C2
3 a
1 a
4 a
71 a
34 a
106 a
5 a
Check (MD only)y
-----
-----
0 a
1 a
1 a
52 a
43 a
95 a
2 a
Means within columns not followed by the same letter are significantly different (Waller-Duncan k-ratio t-test).
Experimental design: RCB, 3 replicates (2 ha each); sampled 100-200 leaves/plot; airblast 1,871 liters/ha.
Tetranychid mite species composition (seasonal average): 36% ERM, 64% TSM, 0% MCD.
x Tank mixed with Orchex 796 Horticultural Spray Oil at 1% vol:vol.
y Low codling pressure in this block necessitated only spot treatment with azinphosmethyl during the second generation. CM cover spray dates were: 1st cover (1C) 31 May; 2nd cover (2C) 21 June; 3rd cover 26 July; 4th cover 12-19 August, 2002.
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