ChileanJAR

Fungicide treatments were tested during four years (1983 to 1986) in field trials conducted at Matanzas (non-irrigated zone of the VI Region, Chile) for efficacy against lentil rust (Uromyces viciae fabae). The fungicide tank-mixture triadimefon plus propineb was applied as foliar spray, in formulation rates of 0.5 + 2.0 kg/ha, at three phenological stages: prebloom, full bloom, and early pod maturity. The large seeded lentil cultivar Araucana-INIA, with a high yielding potential but very susceptible to the disease, was utilized. The objectives ofthe experiments were to determine the best relationship between number and timing of applications to control lentil rust, and to establish the effect of chemical control on yield and seed size of the variety. Disease control and yield were significantly better in plots treated with fungicides applied at prebloom and fuI! bloom, while seed size was also improved.