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

Table 2

Castor response to postemergence herbicides in the High Plains of Texas under weed-free conditions.

Treatment^a,b	Dose (Kg ai/ha)	Stunting
		2008		2009		2008
		21 DAT^c	42 DAT	28 DAT	42 DAT	Yield (Kg/ha)
		%
Untreated	—	0	0	0	0	1532
Acifluorfen	0.42	15	13	27	5	1479
Bentazon	1.12	18	5	27	17	1237
Clethodim	0.21	0	0	2	0	1311
Fluazifop-P-butyl	0.21	0	0	5	0	1240
Imazapic	0.03	68	50	78	79	691
Imazapic	0.07	75	65	83	90	375
Imazethapyr	0.03	12	5	25	10	1191
Imazethapyr	0.07	25	15	42	30	1232
Lactofen	0.05	17	10	18	7	1403
2,4-DB	0.25	91	87	97	94	0
2,4-DB	0.46	97	95	94	88	0
LSD (0.05)		6	7	11	12	281

^aUntreated was maintained weed free.
^bR-11 surfactant added to all treatments at 0.25% v/v.
^cAbbreviations: DAT: days after treatment.