Is there an effective systemic insecticide for controlling spodoptera caterpillars on swamp lilies (crinum)? I am using pyrethrum sprays but the caterpillars keep coming back in droves and are causing horrific damage. I am thinking of using Rogor but am unsure of effectiveness. Am looking for a "wipeout" solution. Anyone?
Hey Jeremy, Rogor (Dimethoate) has now been withdrawn from the market for safety reasons.
I'd normally suggest 'Nature's Way Citrus & Ornamental Spray' but that uses pyrethrum as its main chemical, which is your current approach. We suggest that its best to stay as organic as possible as the knock on effects of powerful chemicals can be worse than the bug.
You can check it out here:
https://www.gardensonline.com.au/Shopping/GardenShop/Show_6535.aspx