Checks and balance

Checks and balance

Prevention is always better than cure at David Nix’s Atherton Tablelands farm.

After all, the arrival of an unwanted pest or disease can instantly devastate the far-north Queensland potato grower’s livelihood – together with those of his neighbours, and regional and state colleagues if quarantine restrictions are imposed.

That threat looms large every day, David says, with tomato potato psyllid (TPP), fire ants, fruit flies and golden cyst nematode among the pests he wants to avoid at all costs.

Therefore, maintaining strict biosecurity practices is essential for growers to play their part in protecting Australia from exotic pests that could impact productivity, the national economy and our way of life.


Clean sweep

The first step towards maintaining biosecurity measures on David’s farm is buying certified seed, predominantly from Victoria.

Second is paddock rotation and a goal to rarely, if ever, grow a crop twice in the same paddock in a five-year period.

This is complemented by weekly spraying (booms and aerial) and the agronomist-assisted introduction of beneficial species, such as parasitic wasps and lady beetles, to control the aphids and other ‘bad bugs’.

 Image: by Michael Petersen

Image: by Michael Petersen

Another protection is iodine, which is used in the packing shed before shipping to Mitchell Foods for use in Lite n’ Easy products. Two computer-controlled systems control the doses of iodine in the washing water – an expensive but necessary practice that is “the best disinfectant you can get”.

Thinking ahead, David suggests a compensation scheme could be introduced for growers inadvertently caught in an outbreak.

“We are clean in comparison with a lot of other countries, including America, and miles cleaner disease-wise. But we’ve got to remain vigilant to keep it that way,” David says.

“Biosecurity comes in with a big hammer, which is understandable as the consequences of disease or pests escaping us are enormous.

“That’s why it’s so important to realise that biosecurity affects us all, and that we take whatever steps we can to prevent any outbreaks.”

Acknowledgement: from the 2017 Potato Grower Success Stories