Home » Natural resources » Weeds, pests & disease management » Overview & SA period histories » Science to the rescue: 1921–1970 Section Navigation On This Page Within This Section Related Pages Control of pest animals and weeds in SA: 1921–1970 Scientific advancements have transformed the control of pest animals and weeds:Science to the rescue: 1921-1970 (PDF 2.7 MB) Share this page Top of page