Getting the most out of your imidacloprid application

Date Posted

5 July, 2022

Posted by

Eli Lin

Growers at an on-farm SRA/MAPS demonstration at the end of June were able to see at close hand the practical issues in applying liquid imidacloprid in ratoons effectively.

The UV dye demonstration on a farm at Mirani was put on with the hope of seeing the difference between three different StoolZippa configurations.

Instead, SRA District Manager Central Dylan Wedel, District Delivery Officer, Steph Duncan, and MAPS Productivity Officer, Shane Hare found out there were larger issues for growers to contend with.

“Because it is difficult to see liquid imidacloprid being applied to the soil, a fluorescent dye was added to it. Growers could see the imidacloprid going into the slot behind the double disc openers in the paddock,” said Dylan.

“Imidacloprid is an important control for cane grubs and with current high greyback canegrub pressure it is important there are no product losses and it is effectively applied to do its job.

“It must be placed accurately at a depth of 100 – 125 mm, to be able to contact the grubs feeding on the roots and to protect it from sunlight degradation.

“However, you can see in our video (below) that in this example the spray isn’t directly between the double disc openers so it is not reaching the bottom of the slot.

“Soil is already falling back into the slot and the chemical application is therefore only 50mm deep.

“The StoolZippa is then exacerbating the problem by taking the soil with the chemical and mixing it with soil on the surface,” said Dylan.

“As a result of the demonstration, the grower has lowered his double disc openers and will change how the liquid is applied.”

Dylan Wedel gave growers the following tips in applying imidacloprid:

  1. Your double disc openers must be set up to open a slot in the soil that is 100 – 125 mm deep.
  2. Your applicator must be set up to ensure that the stream of imidacloprid is being accurately applied to the very bottom of the slot.
  3. The StoolZippa is then able to close the slot ensuring there is 100 – 125 mm of soil cover over the chemical application, protecting it from run-off, volatilisation and sunlight degradation. The spike closing wheels must be set up in their optimum position to do this correctly.

Give Dylan a call on O49O O29 387 if you’d like to discuss your imidacloprid applicator set-up in more detail.




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