Tom from Warwick, Ri writes
Bonide Systemic Insect Control and similar products are not labeled to control Iris Borers. This can be a difficult pest to control on infested plants, so the best prevention is good sanitation and elimination of infested plants. You can use Neem Oil and/or Evergreen Pyrethrum Dust to treat plants before egg hatch of Iris Borer. This article has more information about this common pest.
Answer last updated on: 01/02/2017