Weed Control And Watermelon Tolerance

To SANDEA

Herbicides Labeled for Watermelons

1. Gramoxone,Boa (paraquat)…..…Preplant,

Row Middles

2. Roundup, others (glyphosphate)…Preplant

3. Prefar (bensulide)……………PPI or PRE

4. Curbit (ethalfluralin)…………….…PRE

5. Command (clomazone)……………PRE

6. Alanap (napthalam)………PRE or POST

7. Poast (sethoxydim)…………………POST

8. Treflan HFP (trifluralin)…..Row Middles

Watermelon Trials, Cordele, GA

Vidalia, GA Attapulgus, GA

Non-treated Control Sandea (0.5 oz/A) PRE

Non-treated Control Sandea (0.5 oz/A) POST

2-leaf watermelon

2” Palmer Amaranth

non-treated Sandea 2/3 oz + Curbit 1.5 pt

Crop Injury??

Herbicide Injury RatingsSandea… Pre

0

10

20

30

40

50

60

70

80

% In

jury

April 23 April 27 May 9 May 23 June 18

0.5 oz0.75 oz1.0 ozCheck

Herbicide Injury RatingsSandea… Post (1-2 Leaves)

0

10

20

30

40

50

60

70

80

% In

jury

May 9 May 23 May 29 June 18

0.5 oz0.75 oz1.0 ozCheck

Herbicide Injury RatingsSandea… Post (12-15” Runners)

0

10

20

30

40

50

60

70

80

% In

jury

May 23 May 29 June 18

0.5 oz0.75 oz1.0 ozCheck

Sandea 0.75 oz Post

Untreated

Sandea 0.75 oz/acre Post

Sandea 0.75 oz/acre Post

Sandea 0.75 oz/acre Post

Sandea POST to Watermelon with 12” Runner

Sandea 0.75 oz/acre Late Post

Nontreated Sandea (0.5 oz/acre)

Watermelon farm in Crisp County, May 2000. Treatment at 1-leaf. Pictures to scale.

Sandea (0.5 oz/A) PRE Sandea (0.5 oz/A) POST

2-leaf watermelon

Effects on Yield

Yield DataSandea… 0.5 Oz/acre

0

50

100

150

200

250

lbs

/plo

t

Pre 1-2 leaf 12" runners Check

July 9 July 16 July 23Total

Yield DataSandea… 0.75 Oz/acre

0

50

100

150

200

250

lbs

/plo

t

Pre 1-2 leaf 12" runners Check

July 9

July 16

July 23

Total

Yield DataSandea… 1.0 Oz/acre

0

50

100

150

200

250

lbs

/plo

t

Pre 1-2 leaf 12" runners Check

July 9 July 16 July 23Total

Melon SizeSandea…0.5 Oz/acre

020406080

100120140160180200

lbs

/plo

t

Pre 1-2 Leaf 12" Runners Check

< 20 lb 20-30 lb

Melon SizeSandea…0.75 Oz/acre

020406080

100120140160180200

lbs

/plo

t

Pre 1-2 Leaf 12" Runners Check

< 20 lb 20-30 lb

Melon SizeSandea…1.0 Oz/acre

020406080

100120140160180200

lbs

/plo

t

Pre 1-2 Leaf 12" Runners Check

< 20 lb 20-30 lb

Conclusions1. Curbit is a useful tool in the control of

nutsedge and pigweeds.

Conclusions1. Curbit is a useful tool in the control of

nutsedge and pigweeds.

2. Do not allow Sandea to contact foliage.

Conclusions1. Curbit is a useful tool in the control of

nutsedge and pigweeds.

2. Do not allow Sandea to contact foliage.

3. Sandea PRE may slightly delay maturity.

Conclusions1. Curbit is a useful tool in the control of

nutsedge and pigweeds.

2. Do not allow Sandea to contact foliage.

3. Sandea PRE may slightly delay maturity.

4. Need label for Sandea PRE and

row middles.

Conclusions1. Curbit is a useful tool in the control of

nutsedge and pigweeds.

2. Do not allow Sandea to contact foliage.

3. Sandea PRE may slightly delay maturity.

4. Need label for Sandea PRE and

row middles.

5. Need additional research in

plasticulture systems.