(F20)
SOYBEAN: Glycine max L. ‘Croplan Genetics RT3253’
SEED TREATMENTS IN SOYBEAN, 2007
Ronald B. Hammond
Department of Entomology
Ohio Agricultural Research & Development Center
The Ohio State University
Wooster, OH 44691
Phone: (330) 263-3727
Fax: (330) 263-3686
E-mail: [email protected]
Seedcorn maggot (SCM): Delia platura (Meigen)
Soybean aphid (SA): Aphis glycines Matsumura
Bean leaf beetle (BLB): Cerotoma trifurcate (Förster)
Japanese beetle (JB): Popillia japonica Newman
Various seed treatments along with one foliar insecticide treatment were tested against soybean insects at the OARDC and
the Northwest Agricultural Research Station near Wooster and Custar, OH, respectively, in separate trials. Each test was
designed as a RCB with various insecticide and/or fungicide seed treatments and check plots, with 4 replications. Plot size
was 4 rows by 50 ft at the OARDC and 4 rows by 75 ft at the Northwest Station, with 4 replications at each location. Seed
treatments were commercially applied. At Wooster where SCM was the primary insect of interest, alfalfa was plowed on 27
Apr to enhance maggot populations. Soybean was planted on 8 May in 30-inch rows. At the Northwest Station, fields were
planted no-till into corn residue on 22 May in 30-inch rows. Warrior was applied to two of the treatments at a rate of 3.84 fl
oz/acre on 9 and 16 Aug at Wooster and the Northwest Station, respectively, a time meant to control SA. Stand counts were
taken following emergence by counting the number of plants in 5-ft sections at three locations per plot. The levels of
defoliation from overwintered adult BLB were recorded by rating the plots on a 5 point feeding rating scale. SA sampling
began at both locations in June. Sweep-net sampling began in late July for JB adults and first generation BLB adults.
Harvest data were taken in Oct at both locations. BLB data from sweep-nets were transformed with square root (x + 0.5),
while JB data were transformed with ln (x + 0.5). Data were analyzed with ANOVA and means separated using LSD.
A significant stand loss caused by SCM occurred at Wooster (Table 1). The insecticides Cruiser and V-10170 were able to
prevent loss; however, the 2 treatments with Gaucho were unable to avoid such a loss. A stand loss did not occur at the
Northwest Research Station. Foliage feeding from the BLB cohort that overwintered was evident at the Wooster location,
where seed treatments with Cruiser, Gaucho, or V-10170, were able to significantly reduce feeding (Table 2). The
overwintered BLB population was not observed at the Northwest location because of the late planting (Table 3).
Observations indicated very few SA; thus, aphids were not counted. Because SA did not occur at economic levels, the
application of Warrior provided no benefit. There were no significant differences among the plots at either location for
either adult BLB or JB on any sampling date (Table 2 and 3). Significant yield differences were observed at both locations
(Table 1). At Wooster, yield losses were because of the stand loss, with higher plant stands providing higher yields. At the
Northwest Station, which is known to have greater incidence of various soil pathogens, yields were highest when seed
fungicides were applied.
Table 1.
Plant stands (5 ft)
Treatment/
formulation
Check
Maxim 4FS +
Apron XL
Cruiser 5.0 FS1
Gaucho 600 FS1
V-10170 5.0 SC 1673a
V-10170 5.0 SC 1667a
V-10170 5.0 SC 1667a
Trilex + Allegiance
Gaucho 600 FS +
Trilex + Allegiance
ApronMaxx
CruiserMaxx
ApronMaxx +
Warrior
CruiserMaxx
Warrior
Rate
Wooster
--0.08 fl oz/cwt +
0.16 fl oz/cwt
50.0 gm ai/hkg seed
62.5 gm ai/hkg seed
50.0 gm ai/hkg seed
50.0 gm ai/hkg seed
100.0 gm ai/hkg seed
0.32 + 0.197 fl oz/cwt
1.6 fl oz/cwt +
0.32 + 0.197 fl oz/cwt
6.25 gm/hkg seed
56.25 g ai/hkg seed
6.25 gm/hkg seed +
3.25 fl oz/acre
56.25 g ai/hkg seed +
3.25 fl oz/acre
Yield (bu/acre)
Northwest
Wooster
Northwest
16.5c
18.2c
29.7a
33.6a
39.3cde
37.3ef
54.8c
54.8c
28.3b
21.5c
33.7ab
33.5ab
36.4a
17.0c
21.5c
30.9a
32.3a
33.3a
31.7a
31.7a
35.5a
32.1a
41.3abc
39.7bcde
42.0ab
41.3abc
41.0bcd
39.0cdef
39.7bcde
57.5abc
56.6abc
56.4abc
55.2bc
56.4abc
58.3ab
58.9a
16.2c
30.9ab
18.5c
35.8a
34.5a
34.6a
36.5f
43.3a
38.5def
58.7a
58.9a
58.9a
31.2ab
35.2a
42.8a
59.6a
Means in a column followed by the same letter are not significantly different using LSD (P = 0.05).
a
These treatments also had the fungicides Maxim 4FS + Apron XL added at 0.08 + 0.16 fl oz/cwt added, respectively
Table 2. Wooster
Treatment/
formulation
Check
Maxim 4FS +
Apron XL
Cruiser 5.0 FSa
Gaucho 600 FSa
V-10170 5.0 SC 1673a
V-10170 5.0 SC 1667a
V-10170 5.0 SC 1667a
Trilex + Allegiance
Gaucho 600 FS +
Trilex + Allegiance
ApronMaxx
CruiserMaxx
ApronMaxx +
Warrior
CruiserMaxx
Warrior
Rate
BLB Ratingb
0-5
--0.08 fl oz/cwt +
0.16 fl oz/cwt
50.0 gm ai/hkg seed
62.5 gm ai/hkg seed
50.0 gm ai/hkg seed
50.0 gm ai/hkg seed
100.0 gm ai/hkg seed
0.32+0.197 fl oz/cwt
1.6 fl oz/cwt +
0.32 + 0.197 fl oz/cwt
6.25 gm/hkg seed
56.25 g ai/hkg seed
6.25 gm/hkg seed +
3.25 fl oz/acre
56.25 g ai/hkg seed +
3.25 fl oz/acre
BLB (15 sweeps)
Jul 25
Jul 30
4.0a
3.9a
1.0a
2.8a
0.5d
0.6d
1.0d
0.9d
0.6d
4.0a
1.9c
JB (15 sweeps)
Aug 7
Jul 25
Jul 30
Aug 7
2.5a
2.0a
1.3a
1.3a
46.5a
66.0a
38.0a
45.3a
38.8a
8.0a
4.5a
1.8a
2.5a
1.0a
3.8a
1.8a
3.0a
1.5a
3.8a
1.8a
2.0a
1.8a
0.8a
2.5a
1.5a
2.0a
1.0a
1.0a
1.5a
1.0a
0.8a
52.8a
90.0a
47.8a
39.5a
35.0a
46.0a
67.5a
29.5a
34.3a
29.0a
38.3a
36.8a
29.8a
39.5a
32.0a
26.3a
22.0a
36.3a
25.0a
17.0a
29.0a
3.1b
0.8d
3.9a
2.3a
2.8a
2.5a
1.0a
2.8a
3.0a
1.5a
1.5a
0.3a
41.3a
57.0a
67.3a
38.5a
23.0a
31.8a
36.8a
24.0a
28.0a
0.5d
1.5a
2.3a
1.3a
54.0a
31.3a
18.5a
Means in a column followed by the same letter are not significantly different using LSD (P = 0.05).
a
These treatments also had the fungicides Maxim 4FS + Apron XL added at 0.08 + 0.16 fl oz/cwt added, respectively
b
BLB ratings: 0 = no feeding, 5 = heaviest feeding
Table 3. Northwest Station
Treatment/
formulation
Check
Max 4FS +
Apron XL
Cruiser 5.0 FSa
Gaucho 600 FSa
V-10170 5.0 SC 1673a
V-10170 5.0 SC 1667a
V-10170 5.0 SC 1667a
Trilex + Allegiance
Gaucho 600 FS +
Trilex + Allegiance
ApronMaxx
CruiserMaxx
ApronMaxx +
Warrior
CruiserMaxx
Warrior
Rate
BLB Ratingb
0-5
--0.08 fl oz/cwt +
0.16 fl oz/cwt
50.0 gm ai/hkg seed
62.5 gm ai/hkg seed
50.0 gm ai/hkg seed
50.0 gm ai/hkg seed
100.0 gm ai/hkg seed
0.32+0.197 fl oz/cwt
1.6 fl oz/cwt +
0.32 + 0.197 fl oz/cwt
6.25 gm/hkg seed
56.25 g ai/hkg seed
6.25 gm/hkg seed +
3.25 fl oz/acre
56.25 g ai/hkg seed +
3.25 fl oz/acre
BLB (15 sweeps)
Jul 20
Jul 26
Jul 31
JB (15 sweeps)
Jul 20
Jul 26
Jul 31
0.0
0.0
16.3a
18.5a
18.0a
14.5a
7.3a
8.8a
0.8a
0.8a
1.8a
2.3a
2.8a
6.8a
0.0
0.0
0.0
0.0
0.0
0.0
0.0
18.3a
18.0a
20.8a
15.8a
15.8a
21.3a
20.3a
18.5a
17.8a
10.8a
15.8a
15.5a
16.8a
17.8a
9.8a
8.5a
11.0a
10.0a
6.8a
7.3a
8.3a
0.0a
0.3a
0.8a
0.0a
1.0a
0.8a
0.8a
3.4a
3.3a
4.8a
3.3a
2.8a
4.5a
3.8a
6.3a
4.5a
2.0a
2.3a
5.8a
5.8a
3.3a
0.0
0.0
0.0
20.0a
17.8a
17.5a
13.0a
14.3a
12.3a
17.0a
8.0a
8.0a
0.8a
0.3a
0.3a
3.5a
5.8a
2.5a
2.5a
3.3a
3.0a
0.0
17.3a
15.0a
9.3a
1.8a
3.8a
5.3a
Means in a column followed by the same letter are not significantly different using LSD (P = 0.05).
a
these treatments also had the fungicides Maxim 4FS + Apron XL added at 0.08 + 0.16 fl oz/cwt added, respectively
b
BLB ratings: 0 = no feeding, 5 = heaviest feeding