Evaluation of two organosilicone adjuvants at reduced foliar spray volumes in South African citrus orchards of different canopy densities
J. Gideon van Zyl and Paul H. Fourie
Citrus Research International | Department of Plant Pathology, Stellenbosch UniversityEwald G. Sieverding
Evonik Industries AG, Goldschmidtstraße, GermanyDavid J. Viljoen
Evonik Africa (Pty) Ltd, Somerset West
South African citrus fruit producers rely heavily on medium to high volume fungicide spray applications (Grout, 1997, 2003) to protect citrus fruit from challenging diseases such as Citrus black spot (CBS) (Phyllosticta citricarpa (McAlpine) van der Aa (syn. Guignardia citricarpa Kiely)) (Kotze, 1981, 2000; Schutte et al., 1997) and Alternaria brown spot (Alternaria alternata (Fr: Fr) Keissl., tangerine pathotype) (Schutte, 1996).