Eucalyptus trees are a pest-resistant evergreen that produce good lumber and oil that wealthy elites in the "wellness" marketplace buy - they are also an invasive species.
A new paper shows how scientists used CRISPR-Cas9 to knock out LEAFY, the master gene behind flower formation, so the trees will not reproduce sexually. The greenhouse study involved a hybrid of two species,
Eucalyptus grandis and
E. urophylla, that is widely planted in the Southern Hemisphere; there are more than 700 species of eucalyptus, most of them native to Australia.