Efecto del deshierbe sobre la transmisión de la escaldadura de la cebada, por el hongo Rhynchosporium secalis (Oud.) Davis y en la germinación de semillas

The effect of weeding on the transmission of barley leaf blotch, as well as on the germination of seeds was studied. Ten gene tic lines and three cultivars of barley were used divided in 2 plots, each having 40 blocks of 2 x 1.5 m to provide the source of seed, as well as the data about splash transmission of scald. One plot contained weeds and the other did not. The seeds from all the 80 blocks were collected and sown in the glasshouse for germination tests and for the study of seed transmission of the fungus. The foliar area affected by leaf blotch and transmitted by splash water, in general 'was less in the weedy plot in the field, because the inoculum had more obstacles to overcome, jumping from one sick barley plant to a healthy one; thus there was less germination of the seeds from this plot. The clean plot had twice the number of leaf blotch infected plants, and a better rate of seed germination in the glasshouse.