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Dissipation and Off-site Movement of Aerially Applied Forestry Herbicides Pam Wofford Department of Pesticide Regulation Tribal Environmental Work Group Klamath, CA February 14, 2001. Plant Monitoring. Spring 2000: Two dissipation sampling sites Beargrass One off-site sampling site - PowerPoint PPT Presentation
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Dissipation and Off-site Movement of Aerially Applied Forestry Herbicides
Pam WoffordDepartment of Pesticide Regulation
Tribal Environmental Work GroupKlamath, CA
February 14, 2001
Spring 2000: Two dissipation sampling sitesBeargrass
One off-site sampling siteBeargrass
Fall 2000: Two dissipation sampling sitesYarrowHuckleberryManzanita
Two off-site sampling sitesBeargrassHuckleberryYarrow
Plant Monitoring
â
ââ
(/10 1
P
Q
S
1 0 1 2 Miles
Off-site Movement Sampling Sites
Spring 2000Triclopyr & 2,4-DBeargrass225 acres
Fall 2000Triclopyr & 2,4-DYarrow35 acres
Fall 2000Triclopyr & 2,4-DBeargrass Huckleberry25 acres
Site Plant
Type
Distance (feet)
# of Samples
Triclopyr (ppm)
2,4-D (ppm)
P Beargrass 121 1 NDa NDa
210 1 ND ND
Q Beargrass 185 – 215 3 ND ND
220 – 240 3 ND ND
250 – 285 3 ND ND
Huckleberry 185 – 210 3 NDa NDa
220 – 235 3 ND ND
245 – 260 3 ND ND
S Yarrow 20 – 23 3 NDb – 0.24 NDb – 0.20
100 – 150 4 ND ND
ano detectable amount. MDL is 0.05 ppmbno detectable amount. MDL is 0.10 ppm
Results of sampling for off-site movement
Dissipation Sampling SitesDel Norte County
â
â
â
(/10 1
O
N
R
N0.8 0 0.8 1.6 2.4 Miles
Spring 2000Triclopyr 2,4-DBeargrass25 acres
Spring 2000Triclopyr 2,4-DBeargrass66 acres
Fall 2000Triclopyr 2,4-DYarrow Huckleberry116 acres
Dissipation Sampling SitesHumboldt County
â
Tectah Creek
Mettah Creek
T
2000 0 2000 Feet
N
Fall 2000Tricloypr 2,4-D
Manzanita44 acres
Dissipation of Triclopyr
0
1
2
3
4
5
6
7
0 1 7 9 13 14 16 28 31 43 62 65 91 146
Days after application
Tri
clo
pry
co
nc
en
tra
tio
n (
pp
m)
BeargrassHuckleberryYarrowManzanita
Dissipation of 2,4-D
0
1
2
3
4
5
6
7
0 1 7 9 13 14 16 28 31 43 62 65 91 146Day after application
2,4
-D c
on
ce
ntr
ati
on
(p
pm
) BeargrassHuckleberryYarrowManzanita
Hupa & Karuk Water Monitoring
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