EFFECT OF POWDERY MILDEW (Erysiphe graminis D.C. f.sp. tritici Marchal) ATTACK ON YIELD AND PHISICAL PARAMETERS OF WHEAT (Triticum aestivum ssp. vulgare) GRAIN QUALITY

摘要

Evaluation of yield and phisical grain quality parameters of fungicidaly (Duett) treated and nontreated variants were taken in Krizevci during the three years (1999-2001) on 25 divergent wheat genotypes. Depending on the intensity of attack, the average grain yield in the three year testing period and 25 genotypes of nontreted variants decreased by 8.1%, the average hectolitre weight decreased by 1.2% and the average TKW by 5.1%. The average decrease of the most sensitive cultivar (Marija) was 20.8% for yield, 2.6% for hectolitre weight and 13.1% for TKW. During a strong attack of powdery mildew this decrease for the most sensitive cultivar was 36.4% for yield in 1999, 3.8% for hectoliter weight in 2001, and 20.2% for TKW in 2001. Average differences were nonsignificant for the tested properties in the completely resistant genotype KS92WGRC21 (0.7%, 0.5 and 0.2% respectively).