VARIETYLINT/ACRELENGTHMIKE Deltapine DP555BG/RR 1038**1.054.8 +Deltapine DPLX99X35 10251.074.8 +Phytogen PH98M-2983 9721.074.3 Sure Grow 501BR 944*1.054.6.

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Presentation transcript:

VARIETYLINT/ACRELENGTHMIKE Deltapine DP555BG/RR 1038** Deltapine DPLX99X * Phytogen PH98M * Sure Grow 501BR 944* Phytogen PSC * Stoneville ST4892BR Sure Grow 215BG/RR Stoneville BXN49B Sure Grow FiberMax FM Stoneville ST Stoneville ST4793R BCG 28R Sure Grow Stoneville ST Sure Grow 521R NC Deltapine DP451B/RR BCG Deltapine DP436RR BCG 30R Deltapine PM 1218BG/RR Deltapine DP 20B Deltapine PM 1199RR AVERAGE PERFORMANCE OF EARLY VARIETES – 2002

AVERAGE PERFORMANCE OF EARLY VARIETES

AVERAGE PERFORMANCE OF EARLY VARIETES

AVERAGE PERFORMANCE OF MEDIUM VARIETIES 2002

AVERAGE PERFORMANCE OF MEDIUM VARIETIES

History Mississippi1997

do not break the 4 leaf ruledo not break the 4 leaf rule make post-direct applications as low as possiblemake post-direct applications as low as possible consider alternative chemistry on post- direct applicationsconsider alternative chemistry on post- direct applications History

North Carolina 1998

History North Carolina 1998

No fruit on lower portion of plant Grower’s field Wayne County, North Carolina. Grower said he post-directed cm from ground.

1 st position: No lint 2 nd position: Some lint 3 rd position: Normal Typical symptoms of glyphosate damage to GR cotton fruit. 5-6 days of growth between each new position.

History North Carolina 1998

DP 458BRR-UNTDP 458BRR-4 lf POST DP 458BRR-4 lf POST & 8 lf PD

Pollen from non-treated plants

Pollen from treated plants

Flower from non-treated plant--Good pollen deposition

Flower from glyphosate-treated plant-- pollen deposition only on low stigma

Glyphosate increases anther stigma distances b c b a b a c d b a b a e f d b c a c d b a a a * Means followed by with same letter within a week are not significantly different at alpha = Wk. 1Wk. 2Wk. 3Wk. 4 Stigma tip

History North Carolina 1998

Cross section of ‘cavitated’ boll (DP 90) and fruiting branch Xylem tissue, not sheared Sheared abscission zone Fruiting Branch Peduncle Area of V- shaped scar