H. Toubiarahme et al., INHIBITION OF DRECHSLERA-TERES SCLEROTIOID FORMATION IN BARLEY STRAW BY APPLICATION OF GLYPHOSATE OR PARAQUAT, Plant disease, 79(6), 1995, pp. 595-598
Field-grown barley straw was inoculated with Drechslera teres f. sp. t
eres or D. t. maculata, treated with two herbicides used in no-tillage
barley production, and then incubated in controlled conditions to ind
uce sclerotioid structure morphogenesis (resting form). Formulated her
bicides containing glyphosate or paraquat were applied at three differ
ent concentrations. Applied at the recommended field rate, these herbi
cides significantly reduced sclerotioid structure production by D. ter
es. In addition, their morphology and myceliogenesis were modified in
the presence of both herbicides at the recommended field rate. Glyphos
ate was more inhibitory than paraquat; no sclerotioid structures were
produced in straw when glyphosate was applied before colonization by D
. teres. The effect of the herbicides at 10(-8) and 10(-4) M Varied de
pending on the herbicide, concentration of the active ingredient, meth
od of application, and forma specialis of the pathogen.