EFFECTS OF ADJUVANTS ON THE EFFICACY OF CORAGEN AND
SYNAPSE AGAINST DIAMONDBACK MOTH IN CABBAGE
Cabbage - DBM - Coragen/Synapse +/- DyneAmic - Lang Farm, 2009
Alton N. Sparks, Jr., Extension Entomologist
David G. Riley, Research Entomologist
University of Georgia, Tifton Campus
P.O. Box 748
Tifton, GA 31794
asparks@uga.edu
Introduction
Coragen and Synapse are two new insecticides that have shown excellent control of
caterpillar pests. Both products have been reported to perform better when mixed with a
penetrating adjuvant. This test was conducted to evaluate the efficacy of these two products, with
and without a adjuvant, against diamondback moth on cabbage.
Materials and Methods
A small plot efficacy trial was conducted in cabbage at the University of Georgia’s Lang
Farm in Tifton, Georgia. Plots measured one row (36 inches) by 19 feet. The test was established
as a randomized complete block design with four replications. Insecticide treatments were
applied on 29 April and 15 May, 2009. Applications were made with a CO2 pressurized
backpack sprayer (60 psi) in 40 gpa with 3 hollow-cone nozzles per row (one over-the-top; 2 on
drops). Treatments evaluated were:
Coragen 1.67SC at 5 oz/ac with and without DyneAmic at 0.5% v/v,
Synapse 24WG at 2 oz/ac with and without DyneAmic at 0.5% v/v,
Radiant 1SC at 6 oz/ac (included as a standard),
And a non-treated Check.
Five randomly selected plants in each plot were visually searched on each sample date to
determine insect densities. All caterpillars found were identified and counted. Diamondback
moth was the predominant species and is the only one for which data is reported. Data were
analyzed with the PROC ANOVA procedure of PC-SAS. Where significant differences were
detected (P<0.05), means were separated with LSD (P=0.05).
Results:
All insecticide treatments tested provided good control of DBM. Following the first
application there was a trend for both Coragen treatments and the Synapse+DyneAmic treatment
8
to provide longer residual activity. This difference did not appear after the second application
(DBM populations were in decline after the second application).
9
Table 1. Cabbage Efficacy Trial, Lang Farm, Tifton, Georgia, 2009.
Treatment
Number of Diamondback moth larvae per five plants
1 May
5 May
8 May
11 May
13 May
15 May
20 May
22 May
26 May
28 May
1 June
2 DAT-1
6 DAT-1
9 DAT-1
12 DAT-1
14 DAT-1
16 DAT-1
5 DAT-2
7 DAT-2
11 DAT-2
13 DAT-2
17 DAT-2
Check
12.50 a
12.8 a
10.75 a
14.75 a
13.00 a
19.75 a
23.75 a
22.25 a
10.50 a
6.75 a
8.00 a
Radiant
1.50 b
0.75 b
4.25 bc
4.00 b
3.75 bc
9.75 b
3.25 b
4.25 b
2.50 b
1.25 b
1.25 b
Synapse
2.00 b
2.75 b
6.25 b
0.75 b
6.50 b
8.75 b
4.50 b
4.50 b
1.25 b
1.00 b
0.75 b
Synapse
+DyneAmic
2.00 b
0.50 b
6.00 b
1.25 b
2.25 c
6.25 bc
5.75 b
3.50 b
0.25 b
0.00 b
0.50 b
Coragen
3.00 b
0.75 b
5.75 b
0.25 b
1.75 c
2.25 c
2.50 b
0.50 b
0.25 b
0.00 b
0.50 b
Coragen
+DyneAmic
3.25 b
1.00 b
1.75 c
1.00 b
1.75 c
3.75 c
3.25 b
1.50 b
1.25 b
0.50 b
0.00 b
10