The Journal of Insect Science: Volume 5/Article 16/Table 2

Table 2. Effect of acetamiprid and esfenvalerate on phytophagous and predatory mite densities, September 2000.

Treatment	g AI/ha	CM cover sprays^x	Cumulative mite days
Treatment	g AI/ha	CM cover sprays^x	Twospotted spider mite^y	European red mite	Total tetranchid mites^y	G. occidentalis^y	Z. mali^y	Total predatory mites	Apple rust mite^y
Acetamiprid 70WP	167 g	C1,C2,C3,C4	33 a	181 a	274 a	12 c	24 a	36 b	25,592 a
Acetamiprid 70WP	85 g	C1,C2,C3,C4	4 ab	164 ab	206 ab	21 b	14 ab	35 b	22,793 ab
Esfenvalerate 0.66EC	92 g	C1,C2,C3,C4	9 ab	69 ab	95 ab	23 b	10 ab	33 b	20,780 ab
Untreated check	-----	-----	3 b	30 b	35 b	68 a	2 b	70 a	17,225 b

Means within columns not followed by the same letter are significantly different (Waller-Duncan k-ratio t-test).
Experimental design: RCB, 4 replicates, three-tree, single row; sampled 20 leaves/plot (center tree); airblast 1,871 liters/ha.
Tetranychid mite species composition (seasonal average): 71% ERM, 22% TSM, 7% MCD.
^x Cover sprays: C1, 23 June; C2, 6 July; C3, 24 July; C4, 10 August 2000.
^y Data transformed log(y+0.5) due to unequal variances.