Mr Ndwiga said there could be massive crop failure in the region due to the infestation.
In Turima Location, Tharaka Sub-County, farmers told Nation on Tuesday that they had lost hope of any maize harvest and asked the county government to intervene.
Ms Lucy Kagendo, a resident, said they had sprayed the pest using various pesticides without success.
“We urge the county government to help us get rid of the dangerous pest before it clears our maize farms,” said Ms Kagendo.
Another farmer, Mr James Kinoti, said despite Governor Muthomi Njuki having launched a campaign against the worm and directing extension officers to help growers control the pest, nothing had happened.
Mr Kinoti added that farmers in the area were not familiar with the worm and had no idea of the appropriate pesticide to use.
At the same time, more than 5,000 acres of the maize crop in Isiolo County have been destroyed by the worm.
Livestock Chief Officer Adan Jaldesa said farmers in Burat and Ngaremara have been affected by the infestation, sparking fears of losses among them.
He said the deadly pest, spotted this week, had already caused a lot of damage to crops.