Arthropod Management Tests 2011, Vol. 36
doi: 10.4182/amt.2011.G20
G20
ST. AUGUSTINEGRASS: Stenotaphrum secundatum (Walt.) Kuntze
SOUTHERN CHINCH BUG CONTROL WITH CLOTHIANIDIN, 2010
Eileen A. Buss
University of Florida
Entomology & Nematology Dept.
P.O. Box 110620
Gainesville, FL 32611-0620
Phone: 352-273- 3976
Fax: 352-392-0190
Email: [email protected]
Paul Ruppert
Email: [email protected]
Southern chinch bug (SCB): Blissus insularis Barber
Knockdown and residual effects of different clothianidin formulations and dose rates were evaluated against an existing population of
bifenthrin-resistant SCB on St. Augustine grass. The residential site was in Ocala, FL (Marion County). Treatments (Table 1) were
assigned to plots (3×3 m) in a RCB with four replicates. Sprayable formulations were applied on 14 Jul 2010 with a backpack sprayer
and a CO2 tank (32 psi, spray volume: 11.3 liters per 92.9 m2) onto plots that received 0.5 cm of irrigation. Control plots remained
untreated. Granular formulations were applied on the same day with a hand-held shaker on dry grass. Application conditions: 11.4 cm
turf height, sandy soil, 31.6ºC (89ºF) air temperature, 25.5ºC (78ºF) soil temperature, 56% RH. Plots received 0.6 cm of water
immediately post-application. SCB were vacuum-sampled for 15-s each in three 0.09-m2 circular areas per plot (total: 0.28 m2 for 45
s/plot) at 7, 14, 33, 47, 62, and 75 DAT. The number of live SCB were counted and totaled per plot. Percentage of SCB-caused
damage per plot was evaluated at 50, 62, and 75 DAT. Data were square root transformed before using ANOVA to determine
treatment effects; where appropriate means were separated using Tukey’s test.
Control plots and plots treated with Talstar consistently had more SCB and damage than other treatment plots (Table 1). The best
knockdown effect was provided by Aloft SC LC (6.8 ml), Arena 50WDG at both doses, and by the combination treatment of Arena +
Safari. Both rates of Arena 50WDG and the combination treatment exhibited the longest effect on SCB mortality, even under
considerable population pressure and turfgrass damage (Table 2). SCB damage in the control and Talstar-treated plots approached
50% by 63 DAT. The least amount of feeding damage occurred in plots treated with the low rate of Aloft SC LC.
Table 1.
Total number of live SCB
Treatment/
formulation
Rate2
amt/92.9 m
Aloft SC LC
5.4 ml
Aloft SC LC
6.8 ml
Arena 0.25G
1,062 g
Arena 50WDG
4.2 g
Arena 50WDG
4.2 g
+ Safari 20 SG 5.2 g
Arena 50WDG
6.3 g
Arena 50WDG
8.3 g
Talstar 0.67 LC
29.9 ml
Check
--
7 DAT
14 DAT
33 DAT 47 DAT
62 DAT
75 DAT
6.3bc
1.8c
21.0abc
6.3bc
0.50.2c
5.0bc
1.0c
12.0bc
5.3bc
1.0c
7.3b
4.3b
25.8b
28.0b
4.0b
22.5b
8.7b
22.5b
29.3b
12.3b
37.0b
63.3b
99.5b
75.0b
44.3b
96.8ab
103.3ab
100.3ab
52.3ab
54.3b
3.0bc
2.3bc
36.3ab
57.3a
2.0c
2.3c
32.0ab
83.5a
4.8b
7.5b
212.3a
244.8a
5.0b
5.3b
479.0a
505.3a
22.5b
38.8b
117.0ab
358.5a
47.5b
23.8b
129.3ab
304.0a
Means within columns not followed by the same letter are significantly different (Tukey’s
test, P < 0.05).
Data sqrt-transformed before analysis; non-transformed means presented.
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Arthropod Management Tests 2011, Vol. 36
doi: 10.4182/amt.2011.G20
Table 2.
Percentage of SCB damage within each plot
Treatment/
formulation
Rate -amt/
2
92.9 m
Aloft SC LC
Aloft SC LC
Arena 0.25G
Arena 50WDG
Arena 50WDG
+ Safari 20 SG
Arena 50WDG
Arena 50WDG
Talstar 0.67 LC
Check
5.4 ml
6.8 ml
1,062 g
4.2 g
4.2 g
5.2 g
6.3 g
8.3 g
29.9 ml
--
50 DAT
62 DAT
75 DAT
13.5a
9.5a
19.3a
29.3a
6.5a
5.8b
15.3ab
14.0ab
24.3ab
13.3ab
12.5a
14.8a
21.5a
31.3a
12.3a
13.3a
12.3a
30.3a
36.0a
9.5ab
10.5ab
48.3a
47.8a
15.8a
20.3a
49.0a
48.8a
Means within columns not followed by the same letter are significantly
different (Tukey’s test, P < 0.05).
Data sqrt-transformed before analysis; non-transformed means presented.
2