Ovicidal and larvicidal effectiveness of insecticides applied by dipping apples on the small fruit tortrix Grapholita lobarzewskii

The larvicidal and ovicidal effectiveness of twelve insecticides on Grapholita lobarzewskii Nowicki was tested by dipping apples in different concentrations of the insecticides. Emamectin was the most effective larvicidal product, with an LC 50 of 0.01 mg kg −1 , closely followed by spinosad, methoxyfenozide and chlorpyrifos‐methyl, with LC 50 values between 0.2 and 0.7 mg kg −1 . Products like imidacloprid, indoxacarb, phosmet and thiacloprid gave LC 50 values between 1 and 2 mg kg −1 . Lastly, chlorpyrifos‐ethyl and phosalone had LC 50 values of around 4 mg kg −1 , whereas tebufenozide and diflubenzuron had almost no larvicidal effect. Most of the products tested had low ovicidal effectiveness, and only fenoxycarb and emamectin gave LC 50 values worthy of note, close to 2 mg kg −1 . Copyright © 2007 Society of Chemical Industry