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Average Performance Analysis of Early and Medium Cotton Varieties in North Carolina (1997-2002)

This study outlines the average performance of early and medium cotton varieties in North Carolina from 2000 to 2002. Key findings include the effects of glyphosate application on cotton fruit and pollen deposition, revealing significant implications for growers. The work emphasizes the importance of following best practices like adhering to the four-leaf rule, making minimal post-directed applications, and exploring alternative chemistry. Results aim to guide farmers in improving cotton yields while minimizing potential damage to crops.

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Average Performance Analysis of Early and Medium Cotton Varieties in North Carolina (1997-2002)

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  1. AVERAGE PERFORMANCE OF EARLY VARIETES – 2002

  2. AVERAGE PERFORMANCE OF EARLY VARIETES 2001-2002

  3. AVERAGE PERFORMANCE OF EARLY VARIETES 2000-2002

  4. AVERAGE PERFORMANCE OF MEDIUM VARIETIES 2002

  5. AVERAGE PERFORMANCE OF MEDIUM VARIETIES 2001-2002

  6. Mississippi 1997 History

  7. History • do not break the 4 leaf rule • make post-direct applications as low as possible • consider alternative chemistry on post-direct applications

  8. North Carolina 1998 History

  9. North Carolina 1998 History

  10. No fruit on lower portion of plant Grower’s field Wayne County, North Carolina. Grower said he post-directed 15-20 cm from ground.

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

  12. North Carolina 1998 History

  13. DP 458BRR-UNT DP 458BRR-4 lf POST DP 458BRR-4 lf POST & 8 lf PD

  14. Pollen from non-treated plants

  15. Pollen from treated plants

  16. Flower from non-treated plant--Good pollen deposition

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

  18. Glyphosate increases anther stigma distances Wk. 1 Wk. 2 Wk. 3 Wk. 4 d f d c Stigma tip c e c d b b b b b c a a a b b a a a a a * Means followed by with same letter within a week are not significantly different at alpha = 0.05.

  19. North Carolina 1998 History

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

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