Insect Pest Management in Virginia Cotton, Peanut, and Soybean

Table 64. Mean number of larvae per 3-ft beat cloth sample and percent control 1 , PT11-CEW-2 (Mike Grizzard farm,
Southampton Co., VA). Tidewater AREC, Suffolk, VA, 2011. Insecticide treatments were applied on August 16.
Aug 18 2 Aug 22
# Material Rate
Small
larvae
Medium
larvae
Large
larvae
Total
larvae
Small
larvae
Medium
larvae
Large
larvae
Total
larvae % control
1 Prevathon 0.43SC 9.8 oz/A 2.75 4.00 2.50 a-d 9.25 ab 0.00 b 1.00 b 0.00 b 1.00 b 53.4
2 Prevathon 0.43SC 13.4 oz/A 2.00 1.75 3.25 ab 7.00 bc 0.25 b 0.25 b 0.00 b 0.50 b 65.9
3 Coragen 1.67SC 5 oz/A 0.75 4.25 1.00 d 6.00 bc 0.00 b 0.00 b 0.25 b 0.25 b 71.6
4 Prevathon 0.43SC
+ Asana XL
4.15 oz/A
4.75 oz/A
0.75 2.25 1.25 cd 4.25 c 0.00 b 0.00 b 0.25 b 0.25 b 79.5
5 Belt 4SC 2 oz/A 2.00 3.75 3.00 a-c 8.75 bc 0.25 b 1.00 b 0.00 b 1.25 b 54.5
6 Steward 1.25EC 4.6 oz/A 1.75 2.75 3.00 a-c 7.50 bc 0.25 b 0.25 b 1.00 b 1.50 b 59.1
7 Exirel 10SE
+ MSO
8 Exirel 10SE
+ MSO
13.57 oz/A
0.25% v/v
20.67 oz/A
0.25% v/v
1.25 3.75 1.50 b-d 6.50 bc 0.25 b 0.75 b 0.00 b 1.00 b 65.9
1.25 3.25 1.25 cd 5.75 bc 0.00 b 0.50 b 0.00 b 0.50 b 71.6
9 Untreated 2.00 7.50 4.00 a 13.50 a 2.25 a 2.75 a 3.50 a 8.50 a ---
LSD NS NS 1.76 4.67 0.68 1.28 1.66 2.17 ---
Means within a column followed by the same letter(s) are not significantly different (Protected LSD, P=0.05).
1 Percent control is based on cumulative larval days (CLD) in the treatment relative to the untreated control. CLD’s are calculated with the following equation:
Σ (X i+1 – X i )[(Y i + Y i+1 )/2], where X i and X i+1 are adjacent sample dates and Y i and Y i+1 are corresponding points of total larvae per 3-ft beat cloth sample.
There were 44.0 CLD’s in the untreated control.
2 Larval numbers were multiplied by 2 in the untreated control on August 18.