Costa Comelles, J., Botargues, A., Moreno, A., Portillo, J., Torné, M., & Garcia Marí, F. 1989 Eficacia de algunos plaguicidas sobre las larvas del piojo de San José Quadraspidiotus perniciosus (Comstock). Efecto secundario en la acarofauna del manzano.. Agricola Vergel 88: 209-214.

Notes: Title in English: [Efficacy of some pests on the larvae of the San José scale Quadraspidiotus perniciosus (Comstock). Secondary effect on apple fauna.] Nine chemical control treatments were evaluated against this scale species and its natural enemy Panonychus ulmi.