Gruys, P. 1979 Significance and prctical application of selective pesticides.. Proceedings: Internationales Symposium der IOBC/WPRS über Integrierten Pflanzenschutz inder Landund Forstwirtschaft. OILB/SROP Wien, Austria 648 pp.

Notes: [Book title in English: Proceedings: Iternational Symposium of IOBC/WPRS on Integrated Control in Agriculture and Forestry.] Targets for pesticides include Lepidosaphes ulmi and Quadraspidiotus perniciosus.