- Cabbage -
CABBAGE: Brassica oleracea capitata L.
Diamondback moth; Plutella xylostella (L.)
Cabbage Looper; Trichoplusia ni (Hübner)
Cabbage aphid; Brevicoryne brassicae (L.)
Green peach aphid; Myzus persicae (Sulzer)
CONTROL OF LEPIDOPTEROUS LARVAE AND APHIDS IN A COMMERCIAL CABBAGE FIELD, OKLAHOMA, 1998: Cabbage was direct seeded to a commercial production field near Hydro, OK in Apr. The experimental design was a RCB with 4 replicates and 6 treatments. Plots were 72 inches wide and 25 ft long. Plants in plots were treated with insecticides, not including Admire, using a CO2- powered backpack sprayer with a broadcast application of 72 inches from 4 conejet (TXVS26) nozzles applying 26 gpa at 40 psi. Plots were treated on 23 Apr, 5 and 14 May, 3 and 9 Jun. Admire was applied to the soil surface to the side of the plant rows using the same equipment on 23 Apr. Plots were surveyed to determine insect abundance on 6 and 16 Jun. Three plants per plot were visually examined 6 Jun and 5 plants per plot were examined on 16 Jun. Plants in plots were visually evaluated and a damage rating assigned to 5 plants per plot on 16 Jun. A 0-5 scale was used with 0 being no damage and 5 being damage on entire plant including the head.
Pests were present in low numbers throughout the production cycle. There were no significant differences in abundance of pests in any plots in comparison to the untreated check plots with the exception of the plots treated with Admire. Number of lepidopterous larvae was greater in plots treated with Admire than in plots treated with other insecticides and the untreated plots as was expected based on the selective activity of Admire for controlling aphids and other sucking insects. Plants in the untreated plots had significantly more feeding damage from lepidopterous larvae than did plants in plots receiving any insecticide with the exception of Admire. Plants in plots treated with Warrior had significantly less damage than plants in all other treatment plots.
|
|
|
No.
Larvae/ 3
plants |
No.
Aphids/ 3
plants |
|
|
|
Treatment |
Rate lb
(AI)/acre |
CLa |
DBMa |
Aphidsa |
Damage
rating |
|
Admire |
0.4 |
1.0a |
0.2a |
0.04a |
3.1a |
|
Agree |
2 lbs
/ acre |
0.5b |
0.04b |
0.08a |
2.1b |
|
Thiodan |
0.75 |
0.8ab |
0.0b |
0.00a |
1.3c |
|
Lannate |
0.9 |
0.5b |
0.04b |
0.04a |
1.7bc |
|
Warrior |
0.03 |
0.4b |
0.0b |
0.04a |
0.4d |
|
Untreated |
- |
0.6ab |
0.04b |
0.13a |
3.0a |
Numbers in a column followed by the same letter are not significantly different, LSD, P = 0.1.
aMean numbers averaged across 2 dates, 6 and 16 Jun (date X treatment interaction not significant, P = 0.05).