Control of citrus black spot disease. 1. A comparison of the relative merits of a copper fungicide and maneb for the control of the black spot disease on the Valencia orange
South African Citrus Journal 36(1): 5-11
Treatment of 15-year-old Valencia orange trees with a mixture of calcium arsenate and maneb hastened maturity more effectively, and reduced the percentage of low grade (unexportable) fruits by 17%, compared with a mixture of calcium arsenate and Perenox.