Effect of plot geometry on epidemic velocity of wheat yellow rust

摘要: The size and shape of field plots can impact on both the cost outcome epidemiological experiments. In previous studies, epidemic velocity yellow rust (caused by Puccinia striiformis f.sp. tritici) wheat (Triticum aestivum) has been examined in long, narrow (6·1 m 73–171 m). present study compares spread square, 61 × 61 m versus narrow, 6·1 × 61 m at two locations. objective was to test whether plot a substantial spatiotemporal rust. Velocity increased curvilinearly with time for shapes Curves were nearly identical square upwind downwind directions. Contrary expectation based simulations, results did not indicate faster disease plots, though sizes studied may be beyond that which there is rapid change increase increasing area. also all eight compass directions plots. Results are substantially less costly than equidimensional justified studying other diseases similar characteristics.