TITLE:

Peanut Tolerance to Prowl at AG-CARES, Lamesa, TX, 2000.

AUTHORS:

Peter Dotray, Wayne Keeling, Jarred Karnei, Associate Professor, Professor, Graduate Research Assistant

MATERIALS AND METHODS:

Plot Size:                   4 rows X 40′, 3 replications

Soil Type:                  Amarillo fine sandy loam

Planting Date:          May 2, 2000

Variety:                      Flavorunner 458

Irrigation:                  23.25 inches total season

Application dates:   PPIMarch 28, incorporated with Springtooth harrow

PRE    May 2

Digging Date:           October 1

Harvest Date:           November 15

RESULTS AND DISCUSSION:

Prowl is a dinitroaniline herbicide registered for use in peanut and cotton. Prowl controls annual grass and small-seeded broadleaf weeds such as tumble weed and carelessweed. Previous research indicated good peanut tolerance to Prowl when applied PPI, but little information is available when Prowl is applied preemergence. This study was established to evaluate peanut tolerance to Prowl applied PPI and PRE, Valor applied alone and in combination with Prowl PRE, and Pursuit applied PRE (not currently labeled PRE).

Prowl at 0.75, 1.0, and 1.25 lb ai/A applied PPI or PRE did not injure peanut throughout the growing season (Table 1). Valor at 0.063 lb/A applied alone or in combination with Prowl PRE also did not injure peanut season long. Pursuit at 0.063 (1X) and 0.032 (0.5X) injured peanut 48 to 75% on May 23, 35 to 62% on June 8, and 16 to 40% on July 26.

The only plot that yielded less than the weed-free check plot received a full rate of Pursuit PRE. Previous research has shown that this rate of Pursuit applied POST did not cause a yield reduction. This research indicates that Prowl PPI or PRE may be used in peanut without a loss in peanut yield.

Table 1. Peanut injury and yield as affected by herbicide treatments.
Treatment Name	Rate (lb/A)	Application Method	Peanut Injury (%)			Yield (lb/A)
			May 23	June 8	July 26
Prowl 3.3 EC	0.75	PPI	0      c	0       c	0        c	3330       ab
Prowl 3.3 EC	1.0	PPI	0      c	0       c	0        c	2870       bc
Prowl 3.3 EC	1.25	PPI	0      c	0       c	0        c	3410       ab
Prowl 3.3 EC	0.75	PRE	0      c	0       c	0        c	2980       bc
Prowl 3.3 EC	1.0	PRE	0      c	0       c	0        c	3240       b
Prowl 3.3 EC	1.25	PRE	0      c	0       c	0        c	3190       b
Valor 50 WP	0.063	PRE	0      c	0       c	0        c	3910       a
Prowl + Valor	0.75 + 0.063	PRE	0      c	0       c	0        c	3140       b
Prowl + Valor	1.0 + 0.063	PRE	0      c	0       c	0        c	3210       b
Prowl + Valor	1.25 + 0.063	PRE	0      c	0       c	0        c	3230       b
Pursuit 70 DG	0.063	PRE	75    a	62     a	40      a	2390       c
Pursuit 70 DG	0.032	PRE	48    b	35     b	16      b	3060       b
Weed Free Check	–	—	0      c	0       c	0        c	3330       ab
Means within a column followed by the same letter are not different at the 5% probability level.