weed management in cucurbits. curcurbits select max sinbar alanap sandea curbit herbicide/mulch...
TRANSCRIPT
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Weed Management in Cucurbits
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Curcurbits
• Select Max
• Sinbar
• Alanap
• Sandea
• Curbit
• Herbicide/Mulch relations
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What’s New - Select Max
• clethodim – Registered 2006– Select Max 0.97 EC
– Apply twice the rate of Select 2 EC– For Cantaloupe, Cucumber, Squash, and
Watermelon use 12-16 fl oz/A
– Label allows for use of NIS instead of COC
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Sinbar - Watermelon
2 to 3 oz of product applied preemergence
Seeded: make applications after planting but before the crop emergence
Transplants: Apply prior to transplant on bareground. May apply over mulch but ½ inch rainfall must occur following applications.
Now owned by Tessenderlo Kerley, Inc
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Sinbar – watermelon injury and pigweed control
0102030405060708090
100
%
2 wk 5 wk
1.5 oz 3.0 oz
Watermelon
InjuryPigweed
Control
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Palmer Amaranth Control8 WAT
0102030405060708090
100
Co
ntr
ol
(%)
&&
Curbit + Sinbar 3oz + Sinbar 6oz
Mulch
No Mulch
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Yellow Nutsedge Control8 WAT
0102030405060708090
100
Co
ntr
ol
(%)
&&
Curbit + Sinbar 3oz + Sinbar 6oz
Mulch
No Mulch
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Watermelon Harvest(Total Weight) 1000 lbs/A
0102030405060708090
100
To
tal
Wei
gh
t
&&
Curbit + Sinbar 3oz + Sinbar 6oz
Mulch
No Mulch
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Curbit 1.5 pt/A PRE
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Curbit 1.5 pt/A + Sinbar 2.5 oz
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Curbit 1.5 pt/A + Sinbar 6 oz
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Summary - Watermelon
Sinbar at 3 oz/A provided control of:a) Palmer amaranth = 78-89%
b) Yellow nutsedge = 26-44%
c) Tropic croton = 72-88%
Sinbar at 6 oz/A provided control of:a) Palmer amaranth = 95-97%
b) Yellow nutsedge = 78-80%
c) Tropic croton = 97%
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Cantaloupe – Sinbar• Mulch and Bareground All plots received
• Treatments (Sinbar applied pre-transplant)
– 1) Curbit @ 1 qt/A– 2) Curbit @ 1 qt/A + Sinbar @ 3 oz/A– 3) Curbit @ 1 qt/A + Sinbar @ 6 oz/A
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Cantalope Injury5 WAT
0102030405060708090
100
Inju
ry (
%)
&&
Curbit + Sinbar 3oz + Sinbar 6oz
Mulch
No Mulch
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Cantaloupe Runner Length5 WAT
0102030405060708090
100
Len
gth
(cm
)
&&
Curbit + Sinbar 3oz + Sinbar 6oz
Mulch
No Mulch
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Summary
Bareground Production
- Not a chance
Mulch Production
- Sinbar did not injury cantaloupe 5 WAT
- Sinbar at 6 oz/A reduced runner length 10%, 5 WAT
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Sinbar Carryover
• There are carryover issues after an application of Sinbar most notably the cole and greens crops.
• Sinbar– The label states “Do not replant treated areas
to any crop within 2 years after last application as injury to the subsequent crop(s) may result.”
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Sinbar Watermelon
CARRYOVER RESEARCH IN PROGRESS
Label is very restrictive; UGA preliminary results:
< 10% damage: sweet corn, squash, wheat, oat, rye, snap bean
1X rate 10 to 40% damage: cabbage, kale, broccoli, collard
2X rate: 40 to 80% damage: cabbage, kale, broccoli, collard
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Alanap Going Away – Spring 2008
Chemtura voluntarily canceling registration
Production was stopped Oct. 2007
50,000 gal inventory
2.5 years of inventory if normal use continues
Shelf life is about 3 years
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common ragweed chickweed
common cocklebur purslane
common lambsquarters white mustard
pigweeds smartweeds
Alanap: Weeds Controlled
Production of this herbicide has ceased; 2 yrs of inventory
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Non-treated
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Curbit Curbit followed by Alanap
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Sandea
• PRE/POST to crop: cucumber and cantaloupe
• Row middle only: squash
• PRE and row middle: watermelon
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Sandea Labeled for Watermelon
1) PREEMERGENCE: 0.75 oz/A
Seeded: Apply after planting, before cracking
Transplant bareground/mulch: Do not transplant
till 7 d after application.
*Avoid heavy rain right after application
*DO NOT APPLY OVER MULCH and then transplant.
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Nontreated Sandea (0.5 oz/A)
Watermelon farm in Crisp County, May 2000. Treatment at 1-leaf. Pictures to scale.
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Sandea for PRE Weed Control
common cocklebur
wild radish
pigweeds
common ragweed
common lambsquarters
yellow nutsedge - suppression purple nutsedge - suppression
2 to 3 weeks residual weed control
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Non-treated Control Sandea (0.5 oz/A) PRE
W1-00. Halosulfuron study with Ken Lewis in Cordele.
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Sandea PRE
No herbicide
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Sandea for POST Weed Control
1-3 inch 1-9 inch
passionflower cocklebur
redroot pigweed ragweed
pokeweed velvetleaf
yellow and purple nutsedge – heavy infestations may require sequential applications
2 to 3 weeks residual weed control
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Curbit
1. Curbit is labeled for many cucurbits, Sonalan is not
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Curbit
1. Curbit is labeled, Sonalan is not
2. Do not apply under mulch
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Cucumber Injury from Curbit
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Over mulch, washed off Under mulch
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Over mulch, washed off Under mulch
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Recommend 1 pt if seeded bareground.
If not contacting the crop (row middle or mulch) can go up to 3 pts
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0
20
40
60
80
100
0 1 2 3 4 5
washed
no washed
Amount of Curbit remaining on plastic mulch. TyTy GA, 2005.
perc
ent
daysGrey
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Herbicide/Mulch Relations
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0
20
40
60
1 2 3 4 5
no wash
washed
Amount of paraquat remaining on plastic mulch. TyTy GA, 2005.
perc
ent
daysGrey
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0
20
40
60
80
100
1 2 3 4 5
no wash
washed
Amount of glyphosate remaining on plastic mulch. TyTy GA, 2005.
perc
ent
daysGrey
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Halosulfuron dissipation on mulch
Event
0 1 2 3 4 5
hal
osu
lfu
ron
ret
ain
ed (
%)
0
20
40
60
80
100
% halosulfuron Dry % halosulfuron Wash off
65%
6%
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Non-treatedSandea prior to transplant
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Aim dissipation from mulch
Harvest event
0 1 2 3 4 5
ca
rfen
tra
zon
e r
eta
ine
d (
%)
0
20
40
60
80
100
% carfentrazone Dry
% carfentrazone Wash off
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New Herbicide for Watermelons – 2010?
Preplant or PRE application of Reflex
SEVERE INJURY IF APPLIED TO EMERGED PLANTS
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Percent watermelon injury from Reflex.
Bareground System.
0
5
10
15
20
25
30
Loc 1, 2002
Loc 2, 2003
Loc 3, 2003
Loc 4, 2004
Loc 5, 2006
Loc 6, 2007
Reflex pre-transplant applied 16 oz/A.
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Percent watermelon injury from Reflex.
Mulched System.
0
20
Loc 1, 2003
Loc 2, 2006
Loc 3, 2007
Reflex applied 16 oz/A over mulch. Half inch irrigation prior to transplant.
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Carryover from Reflex applied under mulch. Crops planted 6 months later. 2007
0
20
40
60
80
100
Seeded cucumber Transplant cucumber Seeded squash
Transplant squash Seeded collard Transplant collard
Transplant cabbage Transplant broccoli Sweet corn
% in
jury
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