ABSTRACT
Effect of the complex aphids-virus (BYDV) in the regional wheat trials of La Platina Experiment Station

René Cortázar S.1
 

This effect was analized through the study of the hectoliter weight of the varieties grown in the regional wheat trials, during the years 1975 to 1981, covering the north-central zone of Chile. The economic importance of the complex was very different among localities and years. Near the coast, Hidango, Santa Cruz and Casablanca, there was no reduction of the hectoliter weight due to the complex, in any year. The same happened in Vallenar and Curicó. In San Felipe and in the local ities of the Central Valley, Santiago7 San Fernando and Teno, in some years the Iosses were very important. At the La Platina Experiment Station the reductions in yield, due to the decrease of the hectoliter weight without estimation of the losses dueto the reduction in the number of grains, were as follows: 20% in 1975, 15% in 1976, and 12% in 1977. In 1978, the decrease in yield was 7%, but only a part of this loss could be referred to the complex, because there was also damage caused by P. graminis and by lodging. ln the years 1979, 1980, 1981 there was no studied localities. damage produced by the complex, in any of the studiend localities.

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1 Estación Experimental La Platina (INIA), Casilla 5427, Santiago, Chile.