Insecticide to kill aphids kills plant. I love growing lots of different Kohlerias, my favorite houseplant (from Dibleys). I find aphids if too prolific start to harm them. But spraying with insecticide (Provado) causes it to shrivel its leaves, and the leaves discolour also, seemingly due to the toxicity. I have several of this variety, and this specimen deteriorated in a couple of days. Insect sticky traps only catch a few aphids. Spraying with soapy water has also failed to reduce them. What do people feel is the best way to treat aphid infection. Advice much appreciated.
- 29 May, 2011