ChileanJAR

This paper presents the average yield, hectolíter weight, and incidence of Puccinia striiformis, P. recondita, P. graminis, BYDV and aphids in all wheat trials carried out in the growing seasons 1991, 1992 and 1993 at La Platina Experiment Station (INIA, Santiago). The sowing dates in bread wheats were July 4^th in 1991, June 22^th in 1992 and 1993. Ourum wheats were sown in July 15^th 1991, June 22th 1992 and June 18^th 1993. In 1991 rainfall was similar to the average with an exceptional rain of 41.5 mm, in Oecember. In 1992 and 1993 rainfall was only a 60% of the average. The wheat was grown with irrigation. The average yield for bread wheats was 93.6 qqm/ha in 1991, 59.8 in 1992 and 74.3 in 1993. For the durum wheats 78.3 in 1991, 61.8 in 1992 and 82.4 qqm/ha in 1993. Puccinia recondita was important during the three years for durum wheats and only in 1992 for bread wheats. BYDV was important in 1992 and 1993 and there was high negative correlation (1%) between yield and BYDV in durum wheats. In bread wheats there were negative correlations but they were only significant in the 1993 regional trial (1%).