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- W2110592730 abstract "Abstract Invasive weed control within cleared, forested sites in the inland Northwest is complicated by the susceptibility of ponderosa pine to synthetic auxin herbicide injury, used to control broadleaf weeds. Herbicide injury may lead to decreased canopy volume and variable growth patterns of ponderosa pine, which is a commercially important tree species. Herbicide injury to ponderosa pine can be decreased with dormant-season applications, a timing suited to control many weeds that may occur within ponderosa pine sites. However, spring-timed herbicide applications are needed to control other weeds, such as meadow hawkweed, and that application timing coincides with active ponderosa pine growth. In this study, we determined the level of injury to ponderosa pine resulting from spring-timed aminopyralid, clopyralid, and picloram applications beneath ponderosa pine canopies. Herbicide injury to leader and lateral candles and needle elongation was evaluated 1 and 12 mo after treatment (MAT). Low rates of aminopyralid alone (0.05 kg ae ha −1 [3 fl oz ac −1 ]) and aminopyralid + clopyralid (0.05 + 0.10 kg ae ha −1 ) resulted in herbicide injury ratings that did not differ from untreated trees. The high rate of aminopyralid (0.12 kg ae ha −1 ) resulted in leader candle injury on 75% of treated trees, 5% of which were necrotic at 12 MAT. Herbicide injury was observed on 30% of lateral candles. In comparison, picloram (0.28 kg ae ha −1 ) treatments resulted in necrosis or mortality of leader and lateral candles on 65% and 40% of trees, respectively, at 12 MAT. Results suggest that use of low rates of aminopyralid alone or in combination with low rates of clopyralid minimizes the risk of nontarget injury to ponderosa pine (> 5 yr old) while controlling hawkweed with a spring application." @default.
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- W2110592730 date "2012-06-01" @default.
- W2110592730 modified "2023-10-17" @default.
- W2110592730 title "Effects of Aminopyralid on Ponderosa Pine (Pinus ponderosa)" @default.
- W2110592730 cites W2015143628 @default.
- W2110592730 cites W2169610527 @default.
- W2110592730 cites W2781915698 @default.
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- W2110592730 doi "https://doi.org/10.1614/ipsm-d-11-00052.1" @default.
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