Vol. 51—1997 - NorthEastern Weed Science Society

83
WEED CONTROL IN LIMA BEANS
M.J. VanGessel, W.E. Kee, Q. Johnson, and T. Wootten 1
ABSTRACT
Herbici s currently labeled for use in lima beans (Phaseo/us /unatus L) do not
consistently co trol weed species common in Delmarva. Two studies were conducted
to evaluate th potential of new herbicides for weed control and lima bean tolerance.
The experime tal area had high common ragweed (Ambrosia artemisiifolia L) and
ivyleaf mom in glory [Ipomoea hederacea (L) Jacq.] populations. The first study
examined PR herbicides. The herbicides evaluated were: chloransulam (Firstrate) at
0.01, 0.02, 0.0 ,and 0.04 Ib ai/A; f1umetsulam plus metolachlor (Broadstrike+Dual) at
1.2, 1.4, 1.7, a d 1.91b ai/A; sulfentrazone (Authority) at 0.1,0.15, 0.2, and 0.251bs
ai/A; lactofen ( obra) at 0.2 and 0.251b ai/A; and imazethapyr (Pursuit) plus metolachor
(Dual) at 0.05 nd 1.5 Ib ai/A, respectively. A weedy check was also included. Lima
bean injury, th ee weeks after emergence, was lowest for Pursuit plus Dual, the three
lowest rates a Firstrate and the two lowest rates of Broadstrike+Dual. The highest rate
of Firstrate an the two highest rates of Broadstrike+Dual resulted in 15% crop injury when rated 1 week after
treatment. AI other treatments resulted in