(C28)
BLUEBERRY: Vaccinium corymbosum L. ‘Rubel’
CONTROL OF BLUEBERRY BUDMITE, 2007
John C. Wise
Department of Entomology
Michigan State University
East Lansing, MI 48824-1115
Phone: (517) 432-2668
Fax: (517) 353-5598
E-mail: [email protected]
Ryan Vander Poppen
E-mail: [email protected]
Rufus Isaacs
E-mail: [email protected]
Blueberry budmite (BBM): Acalitus vaccinii Riley
This study was conducted at the MSU Trevor Nichol Research Complex in a Rubel blueberry planting (Blueberry 1), being
a variety that has shown high susceptibility to budmite attack. Insecticides were applied with a tractor-mounted FMC 1029
airblast sprayer calibrated to deliver 50 gpa at 2.5 mph, to plots consisting of 4 bushes (within a row) of 10-year old
blueberries, with a spacing of 4 ft by 12 ft. A pre-count was conducted on 10 Aug. Test materials were applied later the
same day. Budmite evaluations were made on 29 Aug and 17 Sept (Table 1.) by collecting 10 blueberry shoots from the
center of each plot and examining 3 buds per shoot with a dissecting microscope for budmite presence. Data is presented as
% shoots infested and as % buds infested. While actual counts are presented, ANOVA was run on arcsine square-root
transformed data. Transformed treatment means were analyzed using ANOVA and means separation by LSD at P = 0.05.
All treatments provided significant reductions in BBM shoot and bud infestations within 19 d of application, although Mesa
(32 oz) control was less than the others (Table 1). All treatments eliminated BBM infestations in blueberry shoots and buds
by the 17 Sept evaluation period.
Table 1.
% Infested
Pre-Count Aug 10
Aug 29
Sept 17
Treatment/forma
Amt. form/acre
Shoots
Buds
Shoots
Buds
Check
Thiodan 2 EC
Envidor 2 SC
Mesa .078 EC +
Damoil EC
Mesa .078 EC +
Damoil EC
Mesa .078 EC +
Damoil EC
--2 qt/a
18fl oz/a
16fl oz/a
1gal/a
24fl oz/a
1gal/a
32fl oz/a
1gal/a
22.5a
25.0a
22.5a
17.5a
10.8a
10.8a
9.2a
5.8a
30a
0c
0c
0c
13.3a
0.0c
0.0c
0.0c
25a
0b
0b
0b
10a
0b
0b
0b
42.5a
17.5a
0c
0.0c
0b
0b
40.0a
16.7a
5b
1.7b
0b
0b
Means followed by same letter do not significantly differ (P = 0.05, LSD)
All applications made on 10 Aug.
a
Shoots
Buds