2 plants, Callery pear and wall lettuce, marked for Mass. invasive species list

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2 plants, Callery pear and wall lettuce, marked for Mass. invasive species list
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State agriculture officials are moving to prohibit the importation, sale and trade of two plants thought to be invasive to Massachusetts, including one that “is well known for having nasty smelling flowers.” The Department of Agricultural Resources is proposing to add callery pear/Bradford pear (Pyrus calleryana) and wall-lettuce (Mycelis muralis) to the state’s prohibited plant list, which would restrict the…

, which would restrict the propagation, import and sale of the plants in Massachusetts, but would not require plants already in the landscape to be removed.

"Fire blight, caused by a bacterium and thought to be spread by pollinators in pear orchards, had affected over 80% of the annual pear crop in the early 1900s by killing the trees. A search for resistant pear species indicated that Pyrus calleryana was mostly resistant, but there were few plants available," MDAR wrote in its briefing on the plant proposed to be prohibited.

As of August 2022, 15 Callery pear tree locations were confirmed to exist in Essex, Middlesex, Worcester, Norfolk, and Plymouth counties, and a social network for naturalists recorded more than 200 observations of the species across every Massachusetts county except Bristol, Franklin, and Berkshire counties. MDAR said those trees were"a mix of planted and escapees from cultivation into natural areas.

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