Effects of the insect growth regulator pyriproxyfen on immature stages of Sunn Pest, Eurygaster integriceps Puton (Heteroptera: Scutelleridae)

Abstract : The effect of insect growth regulator (pyriproxyfen) on immature stages (eggs and nymphs) of Sunn pest, Eurygaster integriceps Puton (Heteroptera: Scutelleridae), which is of great importance in wheat and barley fields as nymphal and adult stages, was determined. When one day old eggs were treated with concentrations of 0.0, 0.1, 10, 100 and 1000 ppm, the egg hatchability were 96.90, 92.38, 98.4, 93.21 and 55.23 %, respectively. Similar results obtained when 3 day-old eggs were treated. However, when 5 day-old eggs were treated, no significant differences in egg hatchability between treatments observed (F = 1.51, P > 0.01). Adult weight was significantly influenced by treatment of nymphal instars. Treatments of first nymphal instars caused significant differences in adult weight between control and treatments (F = 25.63, P < 0.01). Adult weights were 102.5, 86.14, 69.47, 56.84, 62.11, and 64.56 mg when first instar nymphs were treated with concentrations of 0.0, 0.1, 10, 100 and 1000 ppm pyriproxyfen, respectively. Reduction of adult weight was significantly more when the nymphs were treated with high concentrations of pyriproxyfen. Nymphal developmental time was not significantly affected by pyriproxyfen treatment (P > 0.1). Adult emergence, sex ratio, nymphal survival rate and adults abnormalities were also affected by pyriproxyfen treatments of nymphs
Keyword : Eurygaster integriceps, immature stages, pyriproxyfen
Author(s) : , M. Mojaver, A. R. Bandani
Downloads : 3004


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