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This plant is cassava (also known scientifically as Manihot esculenta), a crop highly valued for its edible, starch-rich roots.
My plant is suffering from swollen growths on its leaves, commonly known as galls or "horns." This is caused by a small flying insect called the gall fly (Jatrophobia brasiliensis). The female of this insect lays her eggs on the leaf, and when the larva hatches, it stimulates the plant to grow in this abnormal way, forming small sacs or horns (in shades of green, white, or reddish) where the larva takes refuge and feeds. I'm told that if only a few leaves are affected, the plant can tolerate it well and it doesn't pose a serious threat.