Watermelon Update
GFVGA Annual Meeting
Watermelon Weed Management
1)
2)
3)
4)
5)
Strategy
Sandea
Pigweed control
Nutsedge control
Morningglory control
Strategy
• cucumbers, melons, squash and
watermelons
• contains 1.6 lb ethalfluralin (Curbit)
and 0.5 lb clomazone (Command)
per gallon
Curbit
• removed from the market????
• replaced with Strategy
Strategy
Soil
Texture
Coarse
Medium
Fine
Broadcast
Rate
2-3 pt
3-4 pt
4-6 pt
Amount of
Curbit
Amount of
Command
1-1.5 pt
1.5-2 pt
2-3 pt
0.33-0.5 pt
0.5-0.67 pt
0.67-1 pt
Georgia use rate for most fields should be 2-3 pt/A.
Strategy
• DO NOT incorporate prior to planting
• DO NOT apply under or OVER row covers,
mulches, or other plant covers
• Beware of the potential for heavy rain
• Do not make broadcast applications to
transplants
Watermelon Injury from Strategy
Applied Topical 1 wk After Transplant
Strategy
• Apply prior to weed emergence
• Apply to seeded crop prior to
emergence, or apply as a banded
spray between rows after crop
emergence or transplanting.
Strategy
• Should be able to obtain same rate of
ethalfluralin (Curbit).
• Command should enhance activity of annual
grasses (expect Texas panicum), sida, croton,
lambsquarters.
• Buffer restrictions are identical to Command
applied alone
• Be aware of carryover from clomazone
Gowan Company
&
Possible preemergence label for watermelon
Watermelon Label
-- Row middle application, 2003
– WILL NOT ALLOW POST APPLICATION
– Possible PRE label in 2004
Cooperative work with Ken Lewis, Crisp Co. and Tom Jennings, Wilcox Co.
Nontreated
Sandea
(0.024 lb ai/A)
Watermelon farm in Crisp County, May 2000. Treatment at 1-leaf. Pictures to scale.
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
Pigweed Control by Sandea
• 0.67 oz PRE = 90 to 100%
Non-treated Control
Sandea (0.5 oz/A) PRE
W1-00. Halosulfuron study with Ken Lewis in Cordele.
Nutsedge Control by Sandea
• 0.67 oz PRE = 65-80% for about 3 wk
No herbicide
Sandea PRE
15
D
A
T
non-treated
Sandea 2/3 oz +
Curbit 1.5 pt
Pigweed Management
Pigweed Management
1) Curbit preemergence
2) Strategy preemergence
3) Alanap preemergence or postemergence
4) Treflan row middle
Pigweed Response to Watermelon
Herbicide Systems at 26 DAT.
Crisp/Wilcox Co. 2002.
100
80
% control
b
a
a
a
Strategy +
Sandea
Strategy +
Alanap
Sandea +
Alanap
b
60
40
20
0
Curbit
Strategy
Curbit, 1.5 pt/A; Strategy, 3 pt/A; Sandea 0.75 oz/A; Alanap 5 qt/A.
Pigweed Response to Watermelon
Herbicide Systems at 42 DAT.
Crisp/Wilcox Co. 2002.
100
a
a
80
a
% control
b
60
c
40
20
0
Curbit
Strategy
Strategy +
Sandea
Strategy +
Alanap
Sandea +
Alanap
Curbit, 1.5 pt/A; Strategy, 3 pt/A; Sandea 0.75 oz/A; Alanap 5 qt/A.
Reduction of Herbicide Control
Tillage that disrupts herbicide layer will
reduce control drastically
Morningglory and Nutsedge
•
Sandea row middle for nutsedge
•
Tillage and competitive crop
Read Labels
1) Sandea carryover or tank clean out issues
2) Command or Strategy buffer requirements
Gowan Company
&