Condy's Crystals (potassium permanganate) for Curl Grubs?

[Drac0]

Just wondering if anyone has tried using Condy's Crystals (potassium permanganate) to treat curl grub infections? Read somewhere that a pinch of this in 5 litres of water and saturating the pot gets them. Currently have quite a number showing up in some of my bigger pots with a bad soil mix & it's a few months away from re-potting time.

Was going to just try drowning them but read on here that someone put one in water for 3 days & it was still going strong so that may not work.

Cheers

[63pmp]

NO!!!! Don't do it!!!!!

While manganese is an essential trace element, in concentrations needed to kill curl grubs it would be toxic to your plants.

In the past to treat curl grubs I would make a standard solution (aphid strength) of pyrethrum and submerge the pots in this, leave for 12 hours. Since moving to inorganic potting mix I don't get them anymore.

Paul