Carbaryl, Carbofuran, and Methomyl - National Marine Fisheries ...

The maximum single application rate for methomyl is 0.9 lbs a.i./acre. Considering labelrequired
buffer zones, simulations at the maximum labeled application rate predict initial average
concentrations of 1-57 μg/L for ground applications and 4-84 μg/L for aerial applications.
Incorporating voluntary buffers listed by CDPR predict concentrations ranging from 0.2 –
58 μg/L.
Table 52. Average initial pesticide concentration in 10 m wide off-channel habitat per lb of
pesticide applied based on AgDrift simulations.
Depth of aquatic habitat Buffer to Aquatic Habitat (ft) Average Initial
(meters)
Concentration in Surface
Water (μg/L)
Aerial Applications, EPA default (ASAE fine-medium droplet size distribution)
2 0 1 17
1 0 1 34
0.5 0 1 67
0.1 0 1 333
2 100 2 5
1 100 2 9
0.5 100 2 19
0.1 100 2 93
2 600 3 1
1 600 3 2
0.5 600 3 4
0.1 600 3 18
2
Aerial Applications, (ASAE very fine – fine droplet distribution)
0 1 22
1 0 1 45
0.5 0 1 89
0.1 0 1 447
2 450 2 4
1 450 2 8
0.5 450 2 16
0.1 450 2 79
2 600 3 3
1 600 3 6
0.5 600 3 13
0.1 600 3 Air Blast Applications, Dormant Spray
64
2 0 1 11
1 0 1 21
0.5 0 1 43
0.1 0 1 214
2 25 2 3
1 25 2 6
0.5 25 2 12
0.1 25 2 62
2 120 3 0.3
1 120 3 1
290