Definition
Frass is pelletized fecal matter produced by plant-parasitic insects and depositied on plant foliage.
Discussion
Frass is a reliable indicator of insect parasitism of plants.
Banana skipper caterpillar (Erionota thrax ) on a banana leaf (Musa sp.) with frass pellets that it defecated. |
 Sugarcane lace bugs on a sugarcane leaf, with tiny fass pellets. |
Frass is pelletized fecal matter produced by plant-parasitic insects and depositied on plant foliage.
Frass is a reliable indicator of insect parasitism of plants.