Toxicity of nine insecticides on four natural enemies of Spodoptera exigua

Sci Rep. 2016 Dec 13:6:39060. doi: 10.1038/srep39060.

Abstract

Spodoptera exigua, which feeds on various crops worldwide, has natural enemies that are susceptible to the insecticides used against S. exigua. We investigate the toxicity and residue risk of 9 insecticides on the development of H. axyridis, C. sinica, S. manilae and T. remus. S. manilae and T. remus adults were sensitive to all 9 insecticides (LC50 less than 2.75 mg a.i. liter-1), while H. axyridis and C. sinica adults were less sensitive (LC50 between 6 × 10-5 mg a.i. liter-1 and 78.95 mg a.i. liter-1). Emamectin benzoate, spinosad, indoxacarb, alpha-cypermethrin, chlorfenapyr and chlorantraniliprole showed no toxicity on H. axyridis, C. sinica, S. manilae and T. remus pupae with the recommended field concentrations. The risk analysis indicated that chlorantraniliprole is harmless to larvae of four natural enemies and adult of H. axyridis, C. sinica and S. manilae. Emamectin benzoate and spinosad had higher safety to the development of H. axyridis, C. sinica, S. manilae and T. remus with the risk duration less than 4d. Indoxacarb, tebufenozide, chlorfenapyr, methomyl, alpha-cypermethrin and chlorpyrifos showed dangerously toxic and long risk duration on S. manilae and T. remus adults.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Coleoptera / drug effects*
  • Coleoptera / growth & development
  • Drug Combinations
  • Holometabola / drug effects*
  • Holometabola / growth & development
  • Hymenoptera / drug effects*
  • Hymenoptera / growth & development
  • Insecticides / toxicity*
  • Ivermectin / analogs & derivatives
  • Ivermectin / toxicity
  • Larva / drug effects
  • Larva / growth & development
  • Lethal Dose 50
  • Macrolides / toxicity
  • Oxazines / toxicity
  • Pyrethrins / toxicity
  • Spodoptera / drug effects
  • ortho-Aminobenzoates / toxicity

Substances

  • Drug Combinations
  • Insecticides
  • Macrolides
  • Oxazines
  • Pyrethrins
  • ortho-Aminobenzoates
  • cypermethrin
  • indoxacarb
  • chlorantranilipole
  • Ivermectin
  • emamectin benzoate
  • chlorfenapyr
  • spinosad