Abstract
Eucalyptus mulch is considered by many horticulturists to be toxic to cultivated plants and weeds. The purpose of this study was to determine the weed suppressive effect of mulch made from various Eucalyptus species. Propagation flats were seeded with 100 seeds each of nine weed species and covered with peat-perlite media, or composted or fresh Eucalyptus globulus, E. citriodora, E. rudus, E. polyanthemos, E. sideroxylon, E. maculata or E. ficifolia. Fresh mulch suppressed germination of all species. Compost mulched weeds seeds germinated more and produced more dry weight than fresh mulch treatments. Barnyardgrass (Echinochloa crusgalli) died in all flats treated with fresh E. sideroxylon.
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