Leaf Scanner: A portable and low-cost multispectral corn leaf scanning device for precise phenotyping

•Portable phenotyping devices are used to estimate plant health noninvasively.•Existing devices measure one small leaf area at one measurement.•We initiated a leaf stitching approach and developed a low-cost corn leaf scanning device.•It could clearly detect chlorophyll and leaf area differences of different treatments plants.•The device also enabled us to precisely explore the chlorophyll distributions over leaves.