WET weather across the eastern Wheatbelt has left many growers turning to aerial spraying for knockdown applications.
Areas around Bruce Rock, Quaraiding and York have been hardest hit, with extensive rains making ground application difficult.
Taurus Aviation, based in Northam, have been kept busy over the last four weeks.
Owner Scott Powell said it was unusual to begin spraying so early.
He said while normally aerial spraying wouldn't start until late May, he had begun spraying late last month.
"So far, we've sprayed glyphosate on between 4,000-5,000 hectares as growers couldn't get on to their paddocks to do their knockdown spray."
Mr Powell said he expected strong demand to continue for post-emergent sprays, topdressing nitrogen and insecticide application due to the wet start to the season.
"The good start of the season means that we expect demand to continue through the season.
"The costs benefit tilts towards aerial spraying later in the season due to potential damage to the crop from wheel tracks. It is also a lot faster than ground spraying."
