Colorado potato beetle (CPB), Leptinotarsa decemlineata (Say), is an important pest of potato crops. Potato foliar amino acids play essential roles in CPB growth. In this study, amino acids were classified into four groups according to their different roles in promoting CPB growth. Then, nitrogen (N) rate effects on the concentrations of amino acid groups were investigated under field conditions. Experiments were carried out with five N rates of 0, 60, 120, 180, and 240 kg N ha⁻¹ in a randomized complete block design. Twenty leaves were collected at 40, 54, 68, and 82 days after planting (DAP) for amino acids analysis. Results showed that N rate had no significant effect on concentrations of each amino acid group at 40 DAP. However, their concentrations linearly increased as N rate increased at 54, 68, and 82 DAP, suggesting that higher N rates could potentially favor CPB growth after potato enters tuber initiation stage.

中文翻译：

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氮肥对赤褐色伯班克马铃薯叶片氨基酸组成的影响

Leptinotarsa decemlineata（Say）是科罗拉多马铃薯甲虫（CPB），是马铃薯作物的重要害虫。马铃薯叶面氨基酸在CPB生长中起重要作用。在这项研究中，根据氨基酸在促进CPB生长中的不同作用，将其分为四类。然后，在田间条件下研究了氮（N）速率对氨基酸基团浓度的影响。以0、60、120、180和240 kg N ha ^-1的5种N速率进行实验在随机完整块设计中。种植后40、54、68和82天（DAP）收集了二十片叶子用于氨基酸分析。结果表明，在40 DAP下，氮的施用量对每个氨基酸的浓度均无显着影响。然而，它们的浓度随着N速率在54、68和82 DAP上的增加而线性增加，这表明在马铃薯进入块茎起始阶段后，更高的N含量可能有利于CPB的生长。