The use of Hi-Cane has caused controversy in the past. In the Bay of Plenty Times in September, opponent Rangi Ahipene said the spray posed a potential risk to people and the environment and the industry needed to start looking at alternatives.
Mr Wilson said when complaints were made about the misuse of Hi-Cane, the orchardists were only given a slap on the wrist.
"It's just unacceptable ... this has been going on for 15 years. I have met with all the industry people, I have met with the regional council yet nothing changes."
School caretaker and parent Shane Ritai said the use of Hi-Cane caused a lot of debate but "having to get the kids to leave the fields and go inside with the windows and doors closed, that's just not on".
"I know it's a touchy subject and we have plenty of good people out there that will tell you when they are spraying, but then you get others who are a bit blase about it."
Bay of Plenty Regional Council pollution prevention officer John Morris confirmed the council had received a complaint about notice periods for spraying Hi-Cane in the vicinity of Te Puna School and an investigation was underway.
The complaint did not relate to any particular spray incident.
The school wanted more than 12 hours' notice and for spraying to be done outside of school hours. The council was working with industry to arrange a meeting between growers and school representatives to resolve the issue.
Mr Morris said Hi-Cane was commonly sprayed on kiwifruit orchards from mid-July through to the end of August.
The council has requirements about notification and managing spray drift when using agrichemicals, including notifying the occupier of any adjoining properties within 50m of spray use about the date of spraying and the type of chemical to be used.
The council had received 32 spray complaints since July 2015, eight of which had been substantiated. Of these, one resulted in a formal warning letter, three investigations were continuing and four had been resolved through mediation and education. The other 24 complaints comprised general inquiries and people seeking information and reassurance about spraying.
Mr Towersey said he understood orchardists needed to spray but it was important for the school to be adequately notified.
He said most of the school's neighbours were good at this.
"We require adequate notification so we can get the information to our parents so they can make their own choice about whether their children attend school on those days. If there's no notification, people can't make an informed choice.
"There have been incidents where orchardists have sprayed without adequate notification to the school. When and where that happens, we're obviously not happy about it."
Te Awanui Huka Pak chairman Neil Te Kani said it sounded like the orchardist had not followed the protocols in place for the safety of adults and children.
Te Awanui Huka Pak is a large Maori-owned kiwifruit company based in Tauranga.
"It concerns me they [the school] weren't notified. These protocols weren't developed overnight."
New Zealand Kiwifruit Growers Inc chief executive Mike Chapman said he was "very concerned" and the organisation had zero tolerance for any breach.
Based on Mr Wilson's video, Mr Chapman said it appeared the correct nozzles were being used and there were no signs of spray drift. He did not know which orchard was involved and was reluctant to comment further until the matter was substantiated.
He encouraged people with any sightings or concerns about spray drift to contact them immediately.
Mr Chapman said 2211 orchards sprayed hydrogen cyanamide in the Bay of Plenty Region in 2014.
NZKGI can be contacted on 0800 232 505.Additional reporting Ruth Keber
