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AVERAGE PERFORMANCE OF EARLY VARIETES – 2002. AVERAGE PERFORMANCE OF EARLY VARIETES 2001-2002. AVERAGE PERFORMANCE OF EARLY VARIETES 2000-2002. AVERAGE PERFORMANCE OF MEDIUM VARIETIES 2002. AVERAGE PERFORMANCE OF MEDIUM VARIETIES 2001-2002. Mississippi 1997. History. History.

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history1
History
  • do not break the 4 leaf rule
  • make post-direct applications as low as possible
  • consider alternative chemistry on post-direct applications
slide13

No fruit on lower

portion of plant

Grower’s field

Wayne County, North Carolina.

Grower said he post-directed 15-20 cm from ground.

slide14

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.

slide16

DP 458BRR-UNT

DP 458BRR-4 lf

POST

DP 458BRR-4 lf

POST & 8 lf PD

slide19

Flower from non-treated

plant--Good pollen deposition

slide20

Flower from glyphosate-treated plant--

pollen deposition only on low stigma

slide21

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.

slide24

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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