*8.2.1 Lorenzo*

In 2006 at the PM stage, diquat-dibromide at 0.28 kg ai ha<sup>1</sup> and glufosinateammonium at 0.58 kg ai ha<sup>1</sup> produced yields that were lower than the untreated check (**Table 3**). None of the other herbicide treatments produced yields that were different from the untreated check. At POST PM, all sesame yields were lower than the untreated check and no differences were noted between herbicide treatments.


#### **Table 3.**

*Sesame yield at Lorenzo and Uvalde as influenced by drydown herbicides.*

drydown. At the PM stage, diquat-dibromide at either rate produced the greatest drydown (63–70%), glufosinate-ammonium was intermediate (45–48%) and carfentrazone-ethyl and glyphosate resulted in ≤18% drydown. At the POST PM stage, the high rates of carfentrazone-ethyl and glyphosate and both rates of diquatdibromide and glufosinate-ammonium resulted in ≥94% drydown while the

*Sesame drydown (7–14 d after treatment) at Lorenzo and Uvalde as influenced by herbicides.*

*PRE PM, prior to physiological maturity; PM, physiological maturity; POST PM, after physiological maturity.*

At the PM stage, diquat-dibromide and glufosinate-ammonium resulted in 67–73% sesame drydown while glyphosate drydown was no more than 57% and no better than the untreated check (**Table 2**). At POST PM no herbicide treatment was

untreated check showed only 28% drydown.

**Carfentrazoneethyl (kg ai ha<sup>1</sup>**

Lorenzo 2006

2007

2008

Uvalde 2007

*a*

**Table 2.**

**)**

LSD (0.05) 6

LSD (0.05) 8

LSD (0.05) 6

LSD (0.05) 7

**Diquatdibromide (kg ai ha<sup>1</sup>**

*Pests, Weeds and Diseases in Agricultural Crop and Animal Husbandry Production*

**)**

Stage<sup>a</sup> 0.018 0.035 0.28 0.56 0.47 0.58 0.63 0.84 Check

PRE PM — — — — — — — —— PM 12 12 24 28 26 26 15 15 0 POST PM 28 36 26 40 44 46 36 52 16

PRE PM — — 78 84 65 73 12 7 4 PM — — 67 74 62 66 13 13 11 POST PM — — 87 93 60 59 38 56 39

PRE PM 14 18 67 80 63 57 4 7 1 PM 18 16 63 70 45 48 14 16 10 POST PM 88 94 97 98 96 98 86 94 28

PRE PM — — — — — — — —— PM — — 67 67 70 73 53 57 50 POST PM — — 80 80 80 77 67 70 73

%

**Glufosinateammonium (kg ai ha<sup>1</sup>**

**)**

**Glyphosate (kg ae ha<sup>1</sup>**

**)**

better than the untreated check.

*8.1.2 Uvalde*

**224**

In 2007 at the PRE PM stage, diquat-dibromide at 0.56 kg ha<sup>1</sup> and both rates of glufosinate-ammonium produced yields that were greater than the untreated check (**Table 3**). At the PM stage, both diquat-dibromide and glufosinate-ammonium increased yield over the untreated check while glyphosate was not different than the untreated check. At the POST PM stage, only diquat-dibromide at 0.56 kg ha<sup>1</sup> increased yield over the untreated check.

In 2008 at any sesame development stage, none of the herbicides improved yields over the untreated check. However, at the POST PM stage, diquat-dibromide at 0.56 kg ha<sup>1</sup> improved sesame yield 29–34% over diquat-dibromide at 0.28 kg ha<sup>1</sup> and glyphosate at 0.84 kg ha<sup>1</sup> (**Table 3**).
