OUST EXTRA COMBINATIONS FOR HERBACEOUS WEED CONTROL AND LOBLOLLY PINE SEEDLING PERFORMANCE J.L. YEISER STEPHEN F. AUSTIN STATE UNIVERSITY A.W. EZELL MISSISSIPPI STATE UNIVERSITY

INTRODUCTION IMPACT OF HWC WIDELY TESTED WELL DOCUMENTED COMMONLY ACCEPTED PRACTICE JUSTIFIES CONTINUED REFINEMENT

CLARIFICATION VELPAR DF=VELPAR OUST XP=OUST ESCORT XP=ESCORT ARSENAL AC=ARSENAL

OBJECTIVE TO COMPARE: ARSENAL, ESCORT, OUST, AND VELPAR MIXTURES FOR: HWC AND PINE GROWTH

METHODS STURGIS, MSNACOGDOCHES, TX PHYSIOGRAPHYUPPER CP SOILRUSTON FINE SANDY LOAM pH 5.3 SANDY CLAY LOAM OVER CLAY LOAM pH 5.0 PREVIOUS STANDNATURALPLANTATION HARVESTED2001DEC-00

METHODS STURGIS, MSNACOGDOCHES, TX SITE PREP #1APR-02 MAY-02 4 LB ULWSINGLE CHOP SITE PREP #2SEP-02JUN-02 BURNARSENAL+ACCORD+REBOUND 10 GPA PLANTEDJAN-03 HAND BARE ROOT DEC-02 MACHINE BARE ROOT

METHODS STURGIS, MS 13-APR-03 NACOGDOCHES, TX 8-APR-03 BAREGROUND<50%60% FORBS+GRASSES35%15%+8% FORBSCOMMON RAGWEED HORSEWEEDWOOLY CROTON LATE BONESET GRASSESBROOMSEDGEPANICUMS WOOLY PANIC GRASS WOODY15% SWEETGUM, OAKS<1% SWEETGUM, OAKS SEMI-WOODYAMERICAN BEAUTYBERRY NONE RUBUS<1%15%

NACOGDOCHES, TX 8-JUN DAT OUSTAR 13ozCHECK ARSENAL+OUST+ESCORT 6+3+1oz

NACOGDOCHES, TX 8-JUN DAT OUST+ESCORT 3+1oz ARSENAL 6oz ARSENAL+OUST+ESCORT 6+3+1oz

NACOGDOCHES, TX 8-JUL DAT CHECK OUSTAR 13oz

NACOGDOCHES, TX 8-JUL DAT CHECK ARSENAL+OUST+ESCORT 6+3+1oz

NACOGDOCHES, TX 8-OCT DAT CHECK ARSENAL+OUST+ESCORT 6+3+1oz OUSTAR 13oz

STURGIS, MS ARSENAL+OUST+ESCORT 6+3+1oz 13-JUN DAT

STURGIS, MS ARSENAL+OUST+ESCORT 6+3+1oz 13-JUL DAT

STURGIS, MS ARSENAL+OUST+ESCORT 6+3+1oz 13-AUG DAT

STURGIS, MS ARSENAL+OUST+ESCORT 6+3+1oz 13-SEP DAT

MONTHLY RAINFALL TOTALS NEAR NACOGDOCHES, TX 2003

NACOGDOCHES, TX BAREGROUND8-MAY DAT 8-JUN DAT 8-JUL DAT 8-OCT DAT CHECK26f24g 4d2e OUST 1383a74bcdef28c24bcd VO ab76bcde31bc23bcd VO abc61f26c18bcde AR 660cde66ef18cd10de AR 446e70cdef18cd13cde O+E 3+154de74bcdef23c19bcde O+E de69def21c19bcde A+O+E a94a66a44a A+O+E bcd83ab45b32abc A+O+E bcd86abc45b36ab A+O+E de80bcd28c19bcde

NACOGDOCHES, TX ARSENAL Bareground 30 DAT60 DAT90 DAT120 DAT180 DAT 456a78a30a26a23a 670a82a43a38a28a Grass Cover 47a4a7a11a14a 68a3a5a10a Forb Cover 413a12a49a47a52a 6 9a 41a44a45a Rubus Cover 418a16a19a 23a 610a14a17a 21a

NACOGDOCHES, TX c b a Duncan’s New Multiple Range Test b ab a b a a c b a b a

NACOGDOCHES, TX b ab a Duncan’s New Multiple Range Test b ab a b a b a a b a b

NACOGDOCHES, TX b b a Duncan’s New Multiple Range Test b b a b a a b a b b a b

NACOGDOCHES, TX SEEDLING SURVIVAL TREATMENTSS1 (%)S2 (%)S3 (%) A+O+E 4+3+1oz100a 99a A+O+E oz 98ab 98a96a A+O+E 6+3+1oz100a A+O+E oz 96ab 94a OUSTAR 13oz 98ab 98a VO oz 98ab 96a94a VO oz 96ab 96a O+E 3+1oz 92b 92a O+E oz100a AR 6oz 96ab 96a AR 4oz100a 90a CHECK100a 98a

NACOGDOCHES, TX TOTAL HEIGHT TREATMENTSHT1 (FT)HT2 (FT)HT3 (FT) OUSTAR 13oz1.93a5.32a8.07a A+O+E 4+3+1oz 1.84ab5.32ab8.14a VO oz 1.77abc5.08abc7.91a A+O+E oz 1.75abc4.86abc7.71a A+O+E 6+3+1oz 1.75abc5.03abc8.01a VO oz 1.72bc4.95abc7.54a O+E oz 1.63cde4.57abcd7.91a AR 6oz 1.66bcd4.48abcd7.11ab A+O+E oz 1.60cde4.70abcd7.34ab AR 4oz 1.47de4.07cd6.88ab O+E 3+1oz1.44e4.30bcd6.69ab CHECK1.43e3.72d6.03b

NACOGDOCHES, TX GROUND LINE DIAMETER TREATMENTSGLD1 (IN)GLD2 (IN)GLD3 (IN) A+O+E 6+3+1oz0.420a1.31ab2.07ab A+O+E 4+3+1oz 0.414ab1.36a2.12a OUSTAR 13oz 0.409abc1.36a2.09ab A+O+E oz 0.399abc1.24abc2.04abc VO oz 0.379abcd1.24abc1.96abc VO oz 0.374bcd1.19abc1.87abc O+E oz 0.361cde1.14abc1.96abc AR 6oz 0.352de1.06abcd1.73abc A+O+E oz 0.346ef1.09abcd1.76abc O+E 3+1oz 0.326ef1.01bcd1.68bcd AR 4oz0.294f0.96cd1.64cd CHECK0.293f0.80d1.32d

NACOGDOCHES, TX VOLUME INDEX TREATMENTSVI1 (FT 3 X10 -3 )VI2 (FT 3 x10 -2 )VI3 (FT 3 ) A+O+E 4+3+1oz2.76a7.81a.281a A+O+E oz2.73a6.79ab.264a OUSTAR 13oz2.63a7.57a.261a A+O+E 6+3+1oz2.40a6.79ab.262a VO oz2.15ab5.76abc.210ab VO oz2.04ab6.06abc.221ab O+E oz2.04ab5.01abcd.243ab A+O+E oz1.54bc4.55abcd.180abc AR 6oz1.98ab4.23bcd.173abc O+E 3+1oz1.37bc4.06bcd.165abc AR 4oz0.98c3.12cd.140bc CHECK1.09c2.15d.088c

Duncan’s New Multiple Range Test NACOGDOCHES, TX c a b ab b a b a

Duncan’s New Multiple Range Test NACOGDOCHES, TX c a b ab b a b a

Duncan’s New Multiple Range Test NACOGDOCHES, TX b a ab NS c a ab

NACOGDOCHES, TX TREATMENTSJUNE MEAN BAREGROUND MEAN VI (FT 3 ) A+O+E 6+3+1oz A+O+E oz A+O+E 4+3+1oz OUSTAR 13oz VO oz VO oz A+O+E oz O+E 3+1oz O+E oz AR 6oz AR 4oz CHECK21.088

STURGIS, MS BAREGROUND13-MAY DAT 13-JUN DAT 13-JUL DAT 13-SEP DAT CHECK26f24g 4d2e OUSTAR 1383a74bcdef28c24bcd VO ab76bcde31bc23bcd VO abc61f26c18bcde AR 660cde66ef18cd10de AR 446e70cdef18cd13cde O+E 3+154de74bcdef23c19bcde O+E de69def21c19bcde A+O+E a94a66a44a A+O+E bcd86abc45b36ab A+O+E bcd83ab45b32abc A+O+E de80bcd28c19bcde

STURGIS, MS GRASS COVER13-MAY DAT 13-JUN DAT 13-JUL DAT 13-SEP DAT CHECK21b15b12ab13ab OUSTAR 134a 1a 9a VO a 2a 2ab10ab VO a 2a 2ab 9ab AR 65a 1a1b9b AR 43a 2a2b7b O+E 3+13a 2a 2ab 19b O+E a 1a 1ab20a A+O+E a 1a 1ab 9a A+O+E a 15a1a A+O+E a 8a1a A+O+E a 1a 11a

STURGIS, MS FORB COVER13-MAY DAT 13-JUN DAT 13-JUL DAT 13-SEP DAT CHECK53c85c90c94d OUSTAR 137a 6a36b69c VO a 2a14a60c VO a 8a41b65c AR 613b50b78c90d AR 421b49b80c88d O+E 3+14a 8a38b O+E a 31b A+O+E a 2a 5a10a A+O+E a 2a 18ab A+O+E a 6a35b A+O+E a 3a 5a 20ab

AGE 1 & 2—STURGIS, MS TREATMENTSHT1 (FT)HT2 (FT)D1 (IN)D2 (IN) A+O+E 4+3+1oz1.84a5.30a.53a1.34a A+O+E oz1.73ab4.90ab.37c1.22a A+O+E 6+3+1oz1.75ab5.05a.51a1.32a A+O+E oz1.73ab5.13a.52a1.24a OUSTAR 13oz1.84a4.76b.43b1.12b VO oz1.70ab4.78b.38c1.06b VO oz1.52b4.33c.36c1.03b O+E 3+1oz1.60b4.57bc.42b1.11b O+E oz1.69ab4.78b.43b1.09b AR 6oz1.61b4.21c.36c.91b AR 4oz1.63b4.51bc.41b.99b CHECK1.55b3.97c.32d.75c

AGE 1 & 2—STURGIS, MS TREATMENTSBAREGROUNDGLD (IN) A+O+E 6+3+1oz91.51 A+O+E oz88.52 A+O+E 4+3+1oz87.53 O+E oz82.43 A+O+E oz83.37 O+E 3+1oz80.42 VO oz75.36 OUSTAR 13oz66.43 VO oz65.38 AR 6oz39.36 AR 4oz37.41 CHECK6.32

CONCLUSIONS NO HERBICIDE DAMAGE OBSERVED THREE-WAY MIXTURES: MOST BARE GROUND MORE MONTHS BG % GROWTH TXMS 1 A+O+E THREE-WAY MIXTURES11 2 HEX TWO-WAYS23 3 OUST EXTRA TWO-WAYS32 4 ARSENAL STAND ALONE44 5 CHECK55 Arsenal AC did not control Rubus and common ragweed Velpar DF+Oust XP did not control wooly croton and Rubus Escort XP controlled horseweed and Rubus and partial on wooly croton ACROSS BOTH SITES 3+1oz WAS BETTER THAN oz