Effects of the IGRs compounds,lufenuron and fenoxycarb on Leptinotarsa decemlineata (Say) (Col.: Chrysomelidae) |
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Authors: | Jafar Hosseinzadeh Shadi Delkhoon |
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Affiliation: | 1. Faculty of Agriculture Science, Department of Plant Protection , Urmia University , Urmia , Iran jafar.entomologist@gmail.com;3. Faculty of Human Sciences, Department of Curriculum , Islamic Azad University , Urmia , Iran |
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Abstract: | In this research work, the susceptibility of egg and four larval instars of Leptinotarsa decemlineata (Say) (Col.: Chrysomelidae) to Insect Growth Regulators (IGRs) compounds (lufenuron 25% EC and fenoxycarb 25% WP) was determined. Different larval instar groups were separated by measuring the head capsule width and were used in all bioassays. The data were analysed with log-probit transformation using the SPSS software. The LC50 for egg was determined by dipping egg masses in different concentration of either compound for 10 s, and LC50 values for each group of larvae was estimated by using treated potato plants. The LC50 values of lufenuron on egg, first, second and third instars of larvae were 682.65, 40.58, 47.83 and 261.38 ppm, respectively, and for fenoxycarb, these were estimated as 897.50, 35.60, 57.91 and 355.23 ppm, respectively. The LD50 values of lufenuron and fenoxycarb on second instar larvae were 139.56 and 228.42 ppm, respectively. |
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Keywords: | IGRs compounds lufenuron fenoxycarb Leptinotarsa decemlineata |
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