Effects of four potato varieties on nutritional measures of Colorado potato beetle Leptinotarsa decemlineata (Say)
Subject Areas :
Keywords: Potato, Leptinotarsa decemlineata, Consumption rate, Nutritional ecology,
Abstract :
Potato is one of the most important agricultural products worldwide and Colorado potato beetle (CPB), Leptinotarsa decemlineata (Say), is one of the most destructive pests of potato causing significant field loss in potato crops. In this research, the larval and adult feedings of CPB were measured on four most prevalent potato varieties (Agria, Marfona, Sabalan and Satina) in East Azerbaijan province, Iran. The investigation was conducted in laboratory conditions at 23±3 °C, 62±10% RH and natural photoperiod of Tabriz during June to August. Leaf consumption, as well as feces output (g) of different stages of CPB was compared within the mentioned varieties. The results indicated that the highest value of leaf consumption by overall immature stages occurred in Agria (0.182±0.007g) while there was no significant difference amongst other varieties. Maximum amount of adult feeding was also in Agria (1.024±0.056 g) where the lowest one was whether in Sabalan or Satina (0.548±0.051g and 0.570±0.076g respectively). The highest consumption rate of overall immature stages was observed in Agria (0.01297±0.00051 g/d) and the lowest one in Satina (0.0069±0.00041 g/d). Like the immature stages, the highest consumption rate of adult CPB also occurred in Agria (0.01667±0.0069 g/d) while the lowest amount of this parameter was in Sabalan (0.00973±0.00070 g/d). Consumption rate of both the third and fourth instar larvae was more accelerated than the adults upon all potato varieties. It could be concluded that the Sabalan and Satina potato varieties are less suitable for feeding by both CPB larvae and adults.
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