14

IV.

Codacide Oil Reduces Drift:

Water has a tendency to produce a wide range of droplet sizes.

Small droplets are prone to drift,

and large droplets are prone to bounce and target run-off.

Codacide provides the ability to attain

more uniform optimum droplet sizes, that reduces the number of driftable fines (small droplets

under 100 um) and the number of run-off prone large droplets (over 200 um).

By improving the

quality of the spray produced by agricultural nozzles, Codacide has important consequences for

optimising pesticide inputs and minimising off-target contamination (Butler Ellis and Tuck, 1999).

From standard flat fan (Butler Ellis

et al,

1997; Miller, 2006), pre-orifice, hollow cone (Butler Ellis and

Tuck 1999) to low pressure, air assisted, mist blowers (Bateman

et al

, 2005; Bateman and Alves,

2000), even spray (Hollaway

et al

2000) to Ultra Low Volume (ULV) and Controlled Droplet

Application (CDA) (Alves

et al

, 2000; Leemon and Jonsson, 2008; Bateman

et al

2000; Dobson, 1986),

Codacide improves droplet uniformity, Volume Median Diameter (VMD) and reduces driftable fines

and the creation of large run off prone droplets.

Fig. 1:

Spray Sheet Length with Standard Flat Fan Nozzle.

Butler Ellis and Tuck (1999) investigated the influence of seven spray liquids (water alone and water

plus one of six adjuvants) on five different hydraulic nozzles (standard flat fan, pre-orifice, hollow

cone, low pressure and evenspray nozzles).

Codacide significantly reduced the liquid sheet length as

compared to water alone and water plus the other six adjuvants (

fig 1,2 & 3

).

Fig 2:

Spray Sheet Length with Hollow Cone Nozzle.

Standard flat fan nozzle spraying 0.5%

Ethokem at 1.0 bar

Standard flat fan nozzle spraying Water

at 1.0 bar

Standard flat fan nozzle spraying 1.0%

Codacide at 1.0 bar

Hollow cone nozzle spraying 0.5%

Ethokem

at 1.5 bar

Hollow cone nozzle spraying water at

1.5 bar

Hollow cone nozzle spraying 1%

Codacide at 1.5 bar