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HS1122: An Iodine-Based Starch Test to Assist in Selecting Leaves for HLB Testing

Figure 3. A healthy citrus leaf will show no (A) or very little (B) staining after immersion in the iodine solution for 2 minutes. Note how the staining that does occur in a healthy leaf (B) is limited to a couple of cell layers along the leaf surface (arrow).

Credit: Pedro Gonzalez