Effect of Two Insect Growth Regulators (IGRs) on Trialeurodes vaporariorum (Homoptera: Aleyrodidae)‎

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Abstract

The effect of four concentrations (0.5, 1, 2.5, and 5 mg/lit) of two insect growth regulators ‎‎(IGRs) of Buprofezin and pyriproxifen on 1 and 4-day eggs, different nymphal instars, and ‎pupae of Trialeurodes vaporariorum (Homoptera: Aleyrodidae), was studied at 26 ± 2 °C, 80 ± ‎‎5% RH, and 16: 8 (L: D) on Lantana camara in the greenhouse. The effect of both IGRs was ‎positively related to increasing of concentrations. The susceptibility of one-day eggs of T. ‎vaporariorum to the insecticides was more than four-day ones, and also early nymphal instars ‎‎(1st and 2nd) than 3rd, 4th, and pupa. The mean percentage of adult eclusion from first to fourth ‎nymphal instars and pupa in 2.5 mg/liter of pyriproxifen was 0, 0, 0, 61.32 ± 11.06, and ‎95.73 ± 3.66, in 5 mg/liter of it was 0, 0, 0, 54.16 ± 10.55, and 98.09 ± 1.14, in 2.5 mg/liter of ‎buprofezin was 19.88 ± 7.67, 48.35 ± 12.05, 60.28 ± 11.34, 85.84 ± 7.18, and 91.85 ± 6.55, and in 5 ‎mg/liter of it was 12.15 ± 4.60, 34.72 ± 8.96, 45.92 ± 7.87, 79.27 ± 8.95, and 92.28 ± 7.13 percent, ‎respectively. ‎

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