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Entomology Image Gallery > Plant Diseases and Damage > Soybean > Soybean Aphid Symptoms Soybean aphid symptoms Soybean aphids suck sap from the plant, which drops onto leaves as honeydew. Black sooty mold often grows on the honeydew and discolors the plant. This image appears in the following articles: Soybean aphid: distribution and impact on soybean (June, 2002)Concerns over soybean aphid continue (August, 2001) |