Investigating the biological and nutritional indices of Colorado potato beetle, Leptinotarsa decemlineata (Say) (Col. Chrysomelidae) on 33 potato cultivars: Evaluating cultivars antibiosis resistance

Document Type : Research paper-Persian

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In this research, the biological and nutritional indices of Colorado potato beetle, Leptinotarsa decemlineata (Say), were evaluated on 33 potato cultivars in greenhouse conditions. Tubers of cultivars were planted in pots and on each pot one sleeve cage were set up, in which 5 newly emerged female adults were released and the weight of them was measured on the 10th day after releasing. In another experiment, 15 first instar larvae were released on each pot and reared. Amounts of consumed foliage of treatments, larval weight on the 12th day after releasing, duration of larvae and pupae (immature stages) and mortality percentages of these stages were determined. Significant differences were observed for all of the studied traits at 1% level. The highest weight of reared adults was observed on the ‛Sinja’ and‛Bright’ cultivars. The least amount of foliage consuming by larvae was observed on the ‛Satina’ and‛Santana’ cultivars. The least weight of neonate larvae on 12th day after releasing was observed on the ‛Myryam’ and‛Carlita’ cultivars. The longest developmental time (larval and pupal time) on potato cultivars was on the ‛Bridjet’ and‛Delikat’ and the highest larval and pupal mortality were on the ‛Arrancar’ and‛Agata’ cultivars. The least weight of female adults, produced from reared larvae, was observed on the ‛Delikat’ and ‛Romina’ cultivars and the least weight of male adults was observed on the ‛Romina’ and‛Delikat’ cultivars. This research revealed that larval preference is independent from nutritional preference of adults.
 

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