20. Preirrigation Conclusions
Preirrigation Conclusions
• Maximum weed emergence occurred at
120 to 130 cumulative degree days (base
temperature = 10°C)
10 C)
• Preirrigation/weed removal was less
beneficial when weed density is low
• Hand weeding times are reduced if preirrigation d
i i ti and weed removal are performed
d
l
f
d
prior to crop planting.
21. Cultivation
• Best when weeds are small
• Dry conditions after cultivation
help to prevent re-rooting
• Shallow cultivation reduces the
quantity of new seeds brought
to the surface
23. Weed Seed Emergence
relative to Depth (inches)
Optimum depth
Maximum depth
Wild oat
1.0
10
7.0
70
Shepherdspurse
0.2
0.8
Lambsquarters
0.3
2.0
g
Crabgrass
0.4
1.6
Foxtail
1.0
3.0
Chickweed
Chi k
d
0.4
04
0.8
08
King 1966
24. Night Cultivation?
• Some studies have found that
cultivation at night reduces weed
germination
• GPS guided systems (?)
p
• Better results after repeat treatments
• At worst, you lose a little sleep
26. Propane Flamers
• Kills weeds like a contact
eeds
herbicide
• Treated leaves go from a glossy
g
g
y
to a mat finish
• Fuel cost??
34. Organic Herbicides
Registered for
Food Use
•
•
•
•
•
C-Cide
Green Match O
Matran EC
Weed Zap
Green Match EX
Not Registered for
Food Use
• Pine Oil
• Racer*
• Acetic Acid –
must be food grade
All are contact type herbicides – no residual activity
42. C Cide
C-Cide 25% 70gpa + 0.5% Natural Wet
81 ºF at 1st and 76 ºF at 2nd application – treated twice
43. For Control of Annual and Broadleaf
Weeds In Non-Crop Areas
ACTIVE INGREDIENT: d-limonene …………… 70%
INERT INGREDIENTS
INGREDIENTS:……….…..………….…. 30%
Total ........................................................................100%
KEEP OUT OF REACH OF CHILDREN
CAUTION
EPA Reg. No. 82052 - 1
R N
EPA Est. No. 82052-GA-1
Manufactured by:
Cutting Edge Formulations, Inc.
5106 Bristol Industrial Way
y
Buford, GA 30518
(866) 906-WEED
DIRECTIONS FOR USE:
It is a violation of Federal Law to use this product in a manner inconsistent with its labeling.
General information: GREENMATCH O is a broad spectrum weed killer that contains a
citrus extract. It is non-selective and controls most annual weeds, both grasses and broadleaves.
For best performance, complete coverage of target weeds is necessary. Spray until thoroughly
wet. It is recommended for non-food areas such as borders, driveways, sidewalks, around mature
trees and ornamentals, around buildings, in greenhouses and around flower beds.
73. Does age (size) make a difference?
d
2nd application d
li i date
Gr
rass control (%
%)
Youngest
g
Oldest
100
90
80
70
60
50
40
30
20
10
0
C-Cide
GreenM
GreenM EX
Matran
Vinegar
WeedZap
S. Horimoto, unpublished
79. Organic Herbicides
• Good spray coverage is essential
70 GPA?
• Work better in warm (sunny?) weather (80ºF)
• Organic adjuvants improve weed control
• Treat when weeds are small
• Repeat applications are needed for larger
weeds