Weed Control and Grain Sorghum (Sorghum bicolor) Tolerance to Pyrasulfotole plus Bromoxynil

Table 3

Grain sorghum injury and yield as influenced by pyrasulfotole plus bromoxynil combinations in 2008.

Herbicide^1,2	Dose	Timing^3	Chlorosis^4,5			Stunting		Yield
			Corpus	Yoakum	Lubbock	Yoakum	Lubbock	Yoakum	Corpus
	Kg ai/ha				%			Kg/ha
Untreated	—	—	0	0	0	0	0	2072	3465
Pyrasulfotole (P)	0.03
+Bromoxynil (B)	0.20	EP	13	3	6	3	0	2539	3385
+Atrazine (A)	0.58
P	0.04
+B	0.24	EP	13	8	7	3	0	2333	3253
+A	0.58
P	0.03
+B	0.20	EP	8	12	13	7	6	2268	3375
+A	0.58
+2,4-D	0.27
P	0.03
+B	0.20	EP	8	10	7	3	2	2430	3266
+A	0.58
+dicamba	0.13
Atrazine	0.58	EP	0	0	0	0	0	2051	3521
P	0.03
+B	0.20	MP	0	20	12	23	0	1639	3411
+A	0.58
P	0.04
+B	0.24	MP	0	20	13	10	0	1486	3582
+A	0.58
P	0.03
+B	0.20	MP	4	6	5	0	10	1344	3527
+A	0.58
+2,4-D	0.27
P	0.03
+B	0.20	MP	0	5	5	0	0	1758	3134
+A	0.58
+dicamba	0.13
Atrazine	0.58	MP	0	0	8	0	4	1583	3267
P	0.03
+B	0.18	EP + MP	8	17	15	3	0	2203	3493
+A	0.58
P	0.03
+B	0.21	EP
+A	0.58		10	15	16	2	3	2430	3237
P	0.03	MP
+B	0.18
P	0.04
+B	0.26	EP
+A	0.58		13	22	20	7	5	2137	3724
P	0.03	MP
+B	0.18
P	0.03
+B	0.26	EP
+A	0.58		25	25	20	23	0	1324	3668
P	0.03	MP
+B	0.26
LSD (0.05)			5	7	4	10	2	678	NS

1At Corpus Christi and Yoakum, all herbicide treatments with the exception of the untreated check included S-metolachlor at 1.11 kg ai/ha applied preemergemce. Also, all treatments with the exception of atrazine alone include ammonium sulfate at the rate of 3.9 kg/378 L.
²Agridex at 1.0% v/v added to all treatments at Corpus and Yoakum while R-11 at 0.25% was added to all treatments at Lubbock with the exception of the atrazine only treatments which included Agridex at 1.0% v/v.  
³Abbreviations: EP (early postemergence), grain sorghum 5 to 10 cm tall; MP (mid postemergence), grain sorghum 30 to 41 cm tall.
⁴Rating scale: 0: crop injury; 100: crop death.
⁵Chlorosis and stunting ratings taken 10 days after herbicide application.