Psalis pennatula, the yellow hairy caterpillar, is a moth of the family Erebidae.

[1] It is found in India, Sri Lanka,[2] Thailand,[3] Australia and Java.

The forewings are coloured in two shades of brown divided by a line from the base to the wingtip.

[5] The caterpillar is known to feed on many agriculturally important crops such as Oryza sativa,[6] Sorghum bicolor, Saccharum officinarum, Imperata cylindrica, Camellia sinensis, Persea bombycina, Shorea robusta, Vigna mungo,[7] Solanum melongena, Tectona grandis, Triticum aestivum, Cucumis sativus, Eleusine coracana, Hyparrhenia, Cyperus and Pennisetum purpureum.

[9] A braconid parasitoid wasp Microplitis pennatula is known to induces rapid behavioral changes in the parasitized host, which is the caterpillar of P.