Young galls on young noni roots (Morinda citrifolia). The galls are the result of hyperplasia following infection by root-knot nematodes (Meloidogyne sp.). |
 Large, swollen root galls on mature noni plant (Morinda citrifolia). The galls are the result of hyperplasia following infection by the root-knot nematodes (Meloidogyne sp.).
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 Hyperplasia on Malay apple (Syzygium malaccense) caused by parasitic psyllids. |
 Hperplastic Hibiscus foliage caused by the hibiscus erineum mite (Aceria hibisci). |
Hyperplasia is abnormal increase in the number of cells, often resulting in the formation of galls or tumors.
Hyperplasia may indicate a hormonal imbalance in a plant caused by parasitism or disease. Plant pathogens and parasitic insects can cause hyperplasia in plants.