Protective effects of the egg stalk of Paratrioza sinica (Hemiptera: Psyllidae) at various angles and spacings against three predaceous coccinellids, Harmonia axyridis, Coccinella septempunctata and Hippodamia variegata (Coleoptera: Coccinellidae).

The egg stalk serves as a physical protection against predators. The evolutionary selective advantage of the egg stalk in providing protection against predators requires more attention. Appropriate selection of predators and irrigation strategies may improve control of P. sinica. © 2017 Society of Chemical Industry.