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

Table 2

Weed control at Lubbock and Yoakum as influenced by pyrasulfotole plus bromoxynil combinations in 2009, 4 weeks after MPOST applications.

			Weed control^4,5
Herbicide^1,2	Dose	Timing^3	A. palmeri	U. texana	C. melo
	Kg ai/ha			%
Untreated	—	—	0	0	0
Pyrasulfotole (P)	0.03
+Bromoxynil (B)	0.20	EP	100	64	100
+Atrazine (A)	0.58
P	0.04
+B	0.25	EP	100	66	100
+A	0.58
P	0.03
+B	0.20	EP	100	69	100
+A	0.58
+2,4-D Amine	0.22
P	0.03
+B	0.20	EP	100	59	100
+A	0.58
+dicamba	0.13
Atrazine	0.58	EP	100	66	100
+bromoxynil	0.21
P	0.03
+B	0.20	MP	100	54	100
+A	0.58
P	0.04
+B	0.25	MP	94	43	100
+A	0.58
P	0.03
+B	0.20	MP	100	58	100
+A	0.58
+2,4 Amine	0.22
P	0.03
+B	0.20	MP	100	38	100
+A	0.58
+dicamba	0.13
Atrazine	0.58	MP	77	69	100
+bromoxynil	0.21
P	0.03
+B	0.20	EP + MP	100	68	100
+A	0.58
LSD (0.05)			13	18	NS

1All herbicide treatments with the exception of atrazine + bromoxynil included ammonium sulfate at the rate of 3.9 kg/378 L.
²Agridex at 1.0% v/v added to all treatments at Yoakum while R-11 at 0.25% was added to all treatments at Lubbock.  
³Abbreviations: EP (early postemergence), weeds 5 to 10 cm tall; MP (mid postemergence), weeds 10 to 20 cm tall. A. palmeri, Amaranthus palmeri S. Wats; U. texana., Urochloa texana (Buckl.) L.; C. melo., Cucumis melo L.  
⁴Rating scale (% weed control), 0: no control, 100: complete control.  
⁵All weeds present at Yoakum while 𝐴. palmeri was present at Lubbock. A. palmeri ratings combined over locations due to a lack of interaction.