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Some plants and trees are resistant to juglone including some species of maple (Acer), birch (Betula), and beech (Fagus). [citation needed] It is highly toxic to many insect herbivores. However, some of them, example Actias luna (Luna moth), can detoxify juglone (and related naphthoquinones) to non-toxic 1,4,5-trihydroxynaphthalene.
The plant pathogenic fungus Leucostoma kunzei (formerly Valsa kunzei) is the causal agent of Leucostoma canker (also known as Cytospora canker or spruce canker), a disease of spruce trees found in the Northern Hemisphere, predominantly on Norway spruce (Picea abies) and Colorado blue spruce (Picea pungens).
May slow clotting; contraindicated for people with bleeding disorders and before and after surgery. May induce uterine contractions; contraindicated when pregnant or nursing. [21] Pyrrolizidine alkaloids (contained in comfrey, borage, senecio, coltsfoot, and others) Liver damage [5] Reserpine: Rauvolfia serpentina
Manchineel trees are often signposted as dangerous. William Ellis, ship's surgeon for James Cook on his final voyage, wrote: On the fourth, a party of men were sent to cut wood, as the island apparently afforded plenty of that article; amongst other trees they unluckily cut down several of the manchineel, the juice of which getting into their ...
Stick to pine, fir and spruce trees. Cedar, cypress and especially yew trees should be avoided because they can be toxic or inedible. Beware trees sold at grocery stores or in parking lots that ...
Walnut trees are any species of tree in the plant genus Juglans, the type genus of the family Juglandaceae, the seeds of which are referred to as walnuts.All species are deciduous trees, 10–40 metres (33–131 ft) tall, with pinnate leaves 200–900 millimetres (7.9–35.4 in), with 5–25 leaflets; the shoots have chambered pith, a character shared with the wingnuts (Pterocarya), but not ...
Forestry workers fell a 40ft (12m) Sitka spruce tree in Northumberland's Kielder Forest before it makes the 330 mile (531km) journey south to stand at the foot of Big Ben in Parliament Square, London.
It can often be difficult in practice to distinguish allelopathy from resource competition. While the former is caused by the addition of a harmful chemical agent to the environment, the latter is caused by the removal of essential resources (nutrients, light, water, etc.). Often, both mechanisms can act simultaneously.