The Cittadella di Alessandria (Italy) is a military fortification that was built in the 18th century. The site has recently been abandoned and is now colonised by weeds, including the invasive Ailanthus altissima. The aim of the study was to compare the efficacy of different herbicides (glyphosate, a mixture of aminopyralid + fluroxypyr and triclopyr + fluroxypyr) applied to cut stumps or to the basal bark of A. altissima. For the cut stump application, plants were first cut at the base and then immediately sprayed and for the basal bark application, the lower 50 cm of the plants was sprayed with the herbicides; untreated cut plants were used as a control, for comparison. Two runs per study were carried out (in summer 2015 and in spring 2016). Efficacy was assessed up to 2018 by counting the resprouts and their height in the cut stump application and, for the basal bark treatment, by measuring the variation in the plant circumference after treatment. The cut stump treatment carried out in summer greatly reduced the number of resprouts, compared to the spring treatment, to less than one sprout per plant when aminopyralid + fluroxypyr was used, and its efficacy lasted for about two years. The basal bark treatment did not control the species, but lower levels of variation in circumference and greater mortality were detected in plants treated with aminopyralid + fluroxypyr. Considering the high level of infestation of the site and the high risk of plant resprouting, repeated cut stump treatments with aminopyralid + fluroxypyr would be preferable to eradicate this invasive species.

中文翻译：

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在十八世纪的堡垒中使用割下的树桩和基皮除草剂控制臭椿（Ailanthus altissima）

亚历山德里亚城堡（意大利）是建于18世纪的军事要塞。该地点最近被废弃，现在被杂草定居，包括入侵的臭椿altissima。这项研究的目的是比较不同除草剂（草甘膦，氨基吡喃酮+氟草烟和三氯吡喃+氟草烟的混合物）在切块或A. altissima的基皮中的功效。。对于切下的树桩施用，首先在基部切下植物，然后立即喷洒；对于基础树皮施用，在下部的50厘米处喷洒除草剂。为了比较，将未处理的切花植物用作对照。每个研究进行了两次运行（2015年夏季和2016年春季）。通过计算残渣及其在切桩应用中的高度，直至2018年，对基皮处理，通过测量处理后植物周长的变化来评估功效。与春季处理相比，夏季进行的残茬处理大大减少了新芽的使用，当使用氨基吡咯烷酮+氟草烟时，每株植物的新芽数量少于一个，并且其功效持续了大约两年。基础树皮处理不能控制该物种，但在用氨基吡喃酮+氟草烟处理的植物中，周长变化较低，死亡率更高。考虑到该地点的高水平侵染和植物发芽的高风险，用氨基吡咯烷酮+氟草烟进行反复的割桩处理将是最好的方法，以根除这种入侵物种。