Importance of foliar diseases over grain yield of wheat varieties in Cauquenes dryland area of Chile

Mario Mellado Z.1, Iván Matus T.1 y Ricardo Madariaga B.1

A field trial to evaluate the importance of foliar diseases over grain yield ofwheat and triticale varieties was carried out at the driyland area of Cauquenes (Iat. 35°38' S; long. 72°17' W; alt. 177 m.s.n.m.) during three cropping season, 1989 to 1991. A split plot design with three replications was used: two treatments (fungicide), and subtreatments (varieties) with 15 genotypes of cereal. The conclusions were: Foliar diseases are secondary in importance tb wheat a d triticale production evaluated in dryland conditions as compared to other environmental limitati ns like water stress during grain filling. Diseases observed during the trials were: septoria leaf blotch (Mycosphaerella graminicola), powdery mildew (Erysiphe graminis, sp tritici) and stripe rust (Puccinia striiformis). Early varieties (135 to 145 days to heading) get a higher and more stable Yield through years than late varieties (150 to 160 days to heading).

Keywords: wheat (triticum aestivum), varieties, diseases, Mycosphaerella graminicola, Erysiphe graminis sp tritici, Puccinia striiformis.
1 Estación Experimental Quilamapu (INlA) ,Casilla 426, Chillán, Chile.