Effect of various potato cultivars on the nutritional indices and activity of some digestive enzymes of Leptinotarsa decemlineata
عنوان دوره: دومین کنگره بین المللی حشره شناسی ایران
نویسندگان
چکیده
Nutritional indices and digestive enzymatic activity of Leptinotarsa decemlineata (Say) (Coleoptera: Chrysomelidae) was studied on eight potato cultivars including Agria, Dayfla, Ceasar, Labadia, Lady Rozeta, Lotta, Marfona, and Santae under laboratory conditions (25±1 °C, 65±5% R.H. and a photoperiod of 16L:8D h). Leptinotarsa decemlineata third instar larvae reared on cultivar Ceasar had the lowest values of food consumed and given larval weight. Approximate digestibility values were highest and lowest on cultivars Agria and Marfona, respectively. The larvae reared on cultivar Santae showed the highest efficiency of conversion of digested food and efficiency of conversion of ingested food. Those larvae that fed on cultivar Agria had the highest relative consumption rate. In contrast, the larvae fed on cultivars Labadia and Ceasar had the lowest relative consumption rate. Furthermore, the larvae fed on cultivars Santae and Agria had the highest relative growth rate. Amylolytic activity in the 4th instar larvae was the lowest on cultivars Ceasar and Labadia. The highest activity was obtained in the larvae fed on cultivars Lotta and Santae. The highest larval proteolytic activity was detected on cultivars Agria, Santae and Lotta. The results indicated that cultivars Labadia and Ceasar were the most unsuitable cultivars for feeding of L. decemlineata.
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