Castor (Ricinus communis L.) Tolerance to Postemergence Herbicides and Weed Control Efficacy

Table 1

Castor response and weed control to postemergence herbicides in south Texas, 2008-2009.

		Stunting		Control
Treatment^a,b	Dose (Kg ai/ha)	17 DAT^c	40 DAT	Cucumis melo	Urochloa texana	Yield (Kg/ha)
		%
Untreated	—	0	0	0	0	349
Acifluorfen	0.42	35	29	82	0	375
Bentazon	1.12	34	10	45	0	162
Clethodim	0.21	0	0	0	98	673
Fluazifop-P-butyl	0.21	0	0	0	100	663
Imazapic	0.03	44	57	93	65	26
Imazapic	0.07	60	74	99	73	0
Imazethapyr	0.03	46	22	80	75	205
Imazethapyr	0.07	38	15	94	57	149
Lactofen	0.05	25	5	92	0	279
2,4-DB	0.25	88	78	86	0	82
2,4-DB	0.46	96	99	82	0	0
LSD (0.05)		20	25	19	33	306

^aUntreated was not maintained weed free and contained all the weeds found in the test area.
^bAgridex added to all treatments at 0.25% v/v.
^cAbbreviations: DAT: days after POST application.