A VISITING US entomologist has slammed Australia’s use of insecticide seed dressings as a prophylactic treatment saying the treatments may be doing more harm than good by killing off beneficial insect species. Jonathan Lundgren, Blue Dasher Farm, South Dakota, said both predatory insect species that feed on problem pests and bees, critical for the pollination of some crops, were adversely impacted by seed dressings in particular by neo-nicotinoid products, which are popular as seed treatments in Australia. “In North America in particular we have eliminated biodiversity in favour of a simplified rotation of soy and corn and we are replacing the function of the biodiversity with chemicals.”
“It easier in the short term to maintain these simplified, degraded agro eco systems with pesticides but this is not sustainable, we’ve replaced biotic resistance with pesticide and this won’t work forever.”
He said the problem for farmers was not that there were insects in the paddocks but that there were uneven populations where problem insects built up in large numbers because of a lack of predator species.
“We need to increase the biodiversity and that means smaller paddocks, wider verges and margins on the edge of fields and more diverse rotations.”
“In research, we’ve found rotations with four to seven different crop types work best.”
Dr Lundgren also suggested growers look at cover crops over summer as a means of building up a habitat capable of sustaining a range of beneficial insect species, along with intercropping two crop species within the one paddock.
Dr Lundgren previously worked for the US Department of Agriculture (USDA) but quit after he alleged he was suspended after complaining USDA was blocking his research into the harmful effects of insecticides on pollinators.
Source: Stock and Land, 20 July 2016
http://www.stockandland.com.au/story/4042325/overuse-of-insecticides-sl…
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