GREEN KYLLINGA (KYLLINGA-BREVIFOLIA) - GERMINATION AND HERBICIDAL CONTROL

Green kyllinga is a relatively new weed species in well-irrigated turf s in the southwest US. To understand the germination requirements of g reen kyllinga, the effects of planting depth, temperature, pH, and osm otic potential were determined. Green kyllinga emergence was sensitive to planting depth. At 21 days after planting (DAP), emergence of gree n kyllinga was 60%, when planted at the soil surface but only 20% at 0 .5 cm and less than 5% at 1 cm. Germination occurred at temperatures b etween 17 and 30 C but was notably better between 20 and 24 C. Germina tion was uniform from pH 5.5 to 9.5. Germination decreased between the water potentials -0.1 to -0.6 MPa, although germination was high at w ater potentials found in irrigated turf. The environmental conditions found in nonstressed turf areas in Arizona will likely support the est ablishment of green kyllinga. The efficacy of herbicides for the contr ol of green kyllinga was also determined. Control of kyllinga (95% or greater) was obtained with preemergence applications of oxadiazon, dit hiopyr, and metolachlor, and with postemergence applications of DSMA, halosulfuron-methyl, and imazaquin.