Nearly a fifth of all land in Scotland is safeguarded, but the amount 'in good health' has fallen.
BBC Scotland's environment correspondentAbout 18% of the land is now legally protected but Scottish Environment Link says some protection is not effective.
It is hoped world leaders at the United Nations' COP15 biodiversity conference in Montreal this week will agree a global pact to do the same.The report's author, Isobel Mercer, told BBC Scotland: "We need to see a step change to get all of those designated features into a favourable condition. The plant was introduced as an ornamental shrub from Asia in the 19th Century but has become one of the biggest threats to native species in Scotland.
Arina Russell, policy and advocacy manager at Woodland Trust Scotland, said: "We know our nature is in trouble, particularly our native and ancient woodlands, and rhododendron ponticum is actually one of the key threats. A review for the Scottish government in 2020, prompted by a population explosion, said numbers should be cut sharply in some areas.
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