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

Figure 4. A leaf that showed strong blotchy mottle symptoms of HLB infection stains very dark grey to black along cut surfaces when immersed in iodine solution for 2 minutes. Note that all cell layers of the leaf are stained unlike in a healthy leaf (see Figure 3B).

Credit: Pedro Gonzalez