NovaChem > Industry News > 2017 > Best kale ever after Exirel application.

Best kale ever after Exirel application.

Published on 26/04/2017

The Central Otago farmer says the timing of DuPont Exirel insecticide, at a critical stage in the crop, helped keep aphids and other pests in check.
It also allowed beneficial insects to work in the crop through until grazing.
“It was the best kale we had ever grown. The stems were the thickest they’ve been which was amazing because we’d had very
little rain.”
Macnicol’s kale was sown at the end of November 2015 and Exirel was applied to the crop in February on the recommendation of local PGG Wrightson technical field rep (TFR), Aimee Dyke.
Macnicol says he was keen to use the insecticide because of its ability to leave key beneficial insects in the crop during and after application, and also its length of residual control.
“An insecticide that doesn’t kill the good bugs - that’s what I thought was quite good about Exirel.”
The difference in the crop before and after application was very impressive, to the point he rang Dyke to find out whether fertiliser
has been included.
“A week later the paddock looked much better than it had before the spray. It was all due to the lack of insect pressure. I didn’t do
anything else differently. I could see the new growth out of the centre leaves.”
Forage rape was also grown on the property last season and didn’t receive an application of insecticide as it was planted in late January and fed off earlier than the kale.
“I left the rape untouched but I should have put the insecticide on as well.”

PGG Wrightson’s Aimee Dyke, says Macnicoll’s kale had insect pressure early in the season although the numbers did not appear to be high.
A decision was made to apply Exirel to the kale because it was the longer season crop.
“It was an easy choice. We know it lasts up to 21 days and often the beneficial insects can continue to do the job afterwards. That may mean not having to get a contractor back for a second spray.”
Exirel controls a wide range of pests including diamond back moth, leaf miner, cabbage white butterfly and aphids (suppression) but importantly leaves key beneficial insects in the crop to continue to work for a long time after the initial insecticide application.
Forage brassica crops have naturally occurring populations of beneficial insects such as predatory wasps, lacewings, ladybird beetles and others.
In many crops last season the excellent initial protection of the new insecticide, combined with beneficial insects working throughout the season, was a main reason only one application was needed through until grazing, she says

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