Study on the development and digestive enzyme activity of Plodia interpunctella feeding on five dried fruits
The effects of five kinds of dried fruits,including red date,raisin,preserved apricot,walnut,and almond,on the growth,development,and digestive enzyme activities of Plodia interpunctella were studied.The results were as follows:dried fruits significantly influenced the oviposition selectivity of P.interpunctella.The egg-laying proportion and amount of P.interpunctella on raisins were the highest,which were 49.17％and 181.20 eggs,respectively,significantly higher than that on other dried fruits.The egg-laying proportion and amount on preserved apricots were 24.23％and 89.20 eggs,respectively.Dried fruits also significantly impacted the development of P.interpunctella.The shortest developmental periods of P.interpunctella larvae were observed when feeding on preserved apricots and raisins,which were 29.91 days and 31.63 days,respectively,showing no significant difference between them,but significantly shorter than those of P.interpunctella feeding on walnuts and almonds.The pupae weight of P.interpunctella feeding on raisins was the heaviest,and the generation survival rate was the highest(17.9 mg/individual and 39.54％,respectively),significantly higher than those feeding on red dates,walnuts,almonds,and preserved apricots.Dried fruits significantly influenced the activities of amylase,lipase,total protease,and trypsin.In conclusion,raisins were the most suitable host for P.interpunctella,followed by red dates,walnuts,almonds,and preserved apricots.P.interpunctella larvae balance the uptake of nutrients from food by regulating digestive enzyme activity.
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