- We report results from a field experiment evaluating the effectiveness of mowing,
mowing and herbicides, and burning on woody plants, key native and non-native grasses and
forbs, and the Fender's blue butterfly. The goal was to find a technique that controlled woody
pest plants without harming native species or promoting non-native species.
Two years after the initial manipulations, all treatments significantly reduced woody
plant cover. Mowing and mowing+herbicide either promoted or had no effect on native
species with the exception of Lupinus arbustus, in which cover was significantly decreased by
mowing. In contrast, burning had mixed effects on native species, promoting growth for some
species and decreasing growth for others. Non-native species were unaffected by mowing or
mowing+herbicide. Burning had also had no effect on non-native species with the exception
of Dactylis glomerata, in which cover was significantly reduced by burning. Two years after
manipulations, the mow+herbicide treatment was the most effective overall treatment for
controlling the woody pest plants and increasing native species without promoting non-native
species. One field season after application of fire-fighting foam, the foam treatment appeared
to have no negative effects on growth or reproduction of either Lupinus sulphureus ssp.
kincaidii or Lupinus arbustus.