Japanese knotweed is just the latest in a long line of aquatic and terrestrial invaders from afar threatening native species, often because invaders aren’t susceptible to local diseases and other afflictions. Garlic mustard, spotted knapweed, purple loosestrife, buckthorn and others have been targeted for eradication with varying degrees of success. Eradicating Japanese knotweed is tough. Fire doesn’t seem to help. If you cut off one stem, another grows faster from the root system. Pulling out the roots with tools can work but takes so much effort that it’s impractical for large patches. “About the only thing that works is chemical treatment,” Gibbs said. “This stuff grows so fast; people say you can watch it grow.” The same hardiness that made the plant useful in gardens is what has caused it to spread.
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What you focus onbecomes larger. The aperture takes priority when shooting landscapes. For maximum depth of field, focus on a point one-third into the scene, just beyond the foreground subject, and stop down to f/16. If your camera has one, use the depth-of-field button to confirm visually what you’re hoping to achieve. At this aperture, with a sensor setting of ISO 100, shutter speeds will drop below 1/15th of a second.
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