Arthropod Management Tests 2012, Vol. 37
doi: 10.4182/amt.2012.F48
(F48)
COTTON: Gossypium hirsutum L., ‘NexGen 4111RF’
EVALAUATION OF INSECTICIDES FOR CONTROL OF MIXED POPULAIONS OF BOLLWORM AND FALL
ARMYWORM IN COTTON, 2011
D. L. Kerns
Texas AgriLife Extension Service
Department of Entomology
Lubbock, TX 79403
Phone: (806) 746-4045
Fax: (806) 746-4057
Email: [email protected]
M. G. Anderson
Texas AgriLife Extension Service
Gaines County
Seminole, TX 79360
Phone: (432) 758-8193
Fax: (432) 758-4031
Email: [email protected]
B. A. Baugh
Texas AgriLife Extension Service
Lubbock County
Lubbock, TX 79408
Phone: (806) 775-1680
Fax: (806) 435-1658
Email: [email protected]
D. R. Patman
Texas AgriLife Extension Service
Crosby/Floyd counties
Crosbyton, TX 79322
Phone: (806) 675-2426
Fax: (806) 675-2348
Email: [email protected]
B. J. Kesey
Texas AgriLife Extension Service
Email: [email protected]
Bollworm (BW): Helicoverpa zea (Boddie)
Fall armyworm (FAW): Spodoptera frugiperda (J.E. Smith)
This test was conducted in a commercial cotton field located near Hobbs, NM. The field was planted on 40-inch rows, and was
irrigated using pivot irrigation. The test was a RCBD with four replications. Plots were 4-rows wide × 50 ft long. Insecticides were
applied on 19 Aug with a CO2 pressurized hand-boom sprayer calibrated to deliver 10 gpa through TX-6 hollow cone nozzles (2 per
row) at 40 psi. Treatments were evaluated by counting the number of small (< 0.25 inch), medium (0.25-0.625 inch) and large (>
0.625 inch) BW and FAW larvae per 10 whole plant samples from the middle two rows of each plot. A pretreatment evaluation was
made on 18 Aug, and post treatment evaluations on 24 and 30 Aug. Data were analyzed using ANOVA and means were separated
using an F-protected LSD (P ≤ 0.05).
On 17 Aug, prior to insecticide application, the population averaged 7.82, 11.26 and 14.20 small, medium and large BW and FAW
larvae per 10 plants respectively (Tables 1, 2 and 3). Before treatment there were no differences for either species of insect at any size
except for medium sized FAWs (Table 2). At that time the Prevathon plots had more of these larvae than the untreated check but not
more than the other insecticides. At 5 days after treatment (DAT), all of the insecticide treatments had fewer total BWs than the
untreated, although Belt did not differ from the untreated for large BWs (Table 1). Against FAWs at 4 DAT, Belt did not reduce the
population significantly lower than the untreated, and Mustang Max did not differ from either Prevathon or Belt (Table 2). This trend
was similar when combining BWs and FAWs (Table 3). By 11 DAT, all of the insecticides should have had sufficient time to fully
express activity. Because of the length of time, most of the larvae were large by this time. On BWs Prevathon and Mustang Max
offered the best control and were significantly better than Belt (Table 1). However, Belt did have fewer BWs than the untreated. For
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Arthropod Management Tests 2012, Vol. 37
doi: 10.4182/amt.2012.F48
FAWs, Prevathon offered significantly the best control (Table 2). For mixed populations of BWs and FAWs, Prevathon was the only
standalone product evaluated, although Belt and Mustang Max do offer some control (Table 3). This research was supported by
industry gifts of products and research funding.
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Arthropod Management Tests 2012, Vol. 37
doi: 10.4182/amt.2012.F48
Table 1.
Number of BW per 10 plants
18 Aug (pre-treatment)
Treatment/
a
formulation
Rate
ozt/acre
Untreated
Belt 4SC
Prevathon 0.43SC
Mustang Max 0.8EC
-3.0
27.0
3.6
a
24 Aug (5 DAT)
30 Aug (11 DAT)
small
med
large
total
small
med
large
total
small
med
large
12.50a
2.50a
6.25a
1.88a
6.25a
4.38a
3.13a
5.63a
8.75a
11.25a
6.88a
4.38a
27.50a
18.13a
16.26a
11.89a
1.75a
0.00b
0.25b
0.25b
4.00a
2.00a
0.25a
2.25a
13.75a
10.00ab
6.50b
6.00b
19.50a
12.00b
7.00b
8.50b
0.00a
0.00a
0.00a
0.00a
0.25a
0.25a
0.25a
0.25a
11.00a
6.50b
2.50c
2.75c
total
11.25a
6.75b
2.75c
3.00c
Values in a column followed by the same letter are not different (F protected LSD; P ≥ 0.05).
Table 2.
Number of FAW per 10 plants
18 Aug (pre-treatment)
Treatment/
a
formulation
Untreated
Belt 4SC
Prevathon 0.43SC
Mustang Max 0.8EC
Rate
oz/acre
small
med
-3.0
27.0
3.6
4.38a
1.88a
0.63a
1.25a
3.13b
6.25ab
10.00a
6.25ab
large
7.50a
7.50a
3.75a
6.88a
a
24 Aug (5 DAT)
30 Aug (11 DAT)
total
small
med
large
total
small
med
large
total
15.00a
15.63a
14.38a
14.38a
1.50a
1.50a
0.00b
1.00a
4.00a
2.00ab
0.25b
1.00b
5.00a
4.00a
1.50a
3.50a
10.5a
7.50ab
1.75c
5.50bc
0.25a
0.00a
0.00a
0.00a
2.00a
0.50a
0.00a
0.50a
5.25a
3.00a
0.25a
5.75a
7.50a
3.50ab
0.25b
6.25a
Values in a column followed by the same letter are not different (F protected LSD; P ≥ 0.05).
Table 3.
Number of BW and FAW per 10 plants
18 Aug (pre-treatment)
Treatment/
a
formulation
Rate oz/acre
Untreated
Belt 4SC
Prevathon 0.43SC
Mustang Max 0.8EC
-3.0
27.0
3.6
a
24 Aug (5 DAT)
30 Aug (11 DAT)
small
med
large
total
small
med
large
total
small
med
large
total
16.88a
4.38a
6.88a
3.13a
9.38a
10.63a
13.13a
11.88a
16.25a
18.75a
10.63a
11.26a
42.50a
33.76a
30.64a
26.27a
3.25a
1.50b
0.25b
1.25b
8.00a
4.00ab
0.50b
3.25b
18.75a
14.00ab
8.00b
9.50b
30.00a
19.50b
8.75c
14.00bc
0.25a
0.00a
0.00a
0.00a
2.25a
0.75a
0.25a
0.75a
16.25a
9.50b
2.75c
8.50bc
18.75a
10.25b
3.00c
9.25b
Values in a column followed by the same letter are not different (F protected LSD; P ≥ 0.05).
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