sentences:  These fungicides require four applications at 10- to 14-day intervals, beginning at the first appearance of the disease, and produce a significantly reduced percent disease index and percent leaves infected in comparison to untreated plants.Benzimidazole fungicides are also known to be effective, though these have been out of production for several years.Since mangoes are a perennial crop and therefore the farmers that raise them are obligated to produce the same product from one year to the next despite any economic and production changes, fungicide applications may vary from year to year.