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Juglone occurs naturally in the leaves, roots, husks, fruit (the epicarp), and bark of plants in the Juglandaceae family, particularly the black walnut (Juglans nigra), and is toxic or growth-stunting to many types of plants. [1] It is sometimes used as an herbicide, as a dye for cloth and inks, and as a coloring agent for foods and cosmetics.
[23] [24] However, different walnut species vary in the amount of juglone they release from the roots and fallen leaves - J. nigra, in particular, is known for its toxicity, both to plants and horses. [25] Juglone is toxic to plants such as tomato, apple, and birch, and may cause stunting and death of nearby vegetation. Juglone appears to be ...
The black walnut (Juglans nigra) produces the allelochemical juglone, which affects some species greatly while others not at all. However, most of the evidence for allelopathic effects of juglone come from laboratory assays and it thus remains controversial to what extent juglone affects the growth of competitors under field conditions. [28]
Cucurbits, brassica, lettuce, rosemary, dill, strawberry, [18] rose: Summer savory, rose: Honeybees: Tomatoes and other solanaceae: This wildflower is a legume, hosting bacteria that fixes nitrogen in the soil, fertilizing it for neighboring plants. Same with marigold, planting nearby roses causes them to grow vigorously. Marigold
Juglans regia, the common walnut [1] or Persian walnut [2] amongst other regional names, is a species of walnut.It is native to Eurasia in at least southwest and central Asia and southeast Europe, but its exact natural area is obscure due to its long history of cultivation.
Rose slugs (rose sawflies) – Sawflies are non-stinging wasps (Hymenoptera) in the suborder Symphyta, not flies . They lay eggs in plant leaves or stems with a saw-like ovipositor . There are three species that commonly cause damage to wild or cultivated roses: [ 5 ] The bristly roseslug ( Cladius difformis ) is found in Europe, Siberia, and ...
The black walnut is one of the earliest studied examples of allelopathy and produces juglone, which inhibits growth and water uptake in neighboring plants. [31] In studies of juglone in black walnuts and their target species, the presence of mycorrhizal networks caused target plants to exhibit reduced growth by increasing the transfer of the ...
Mespilus germanica, known as the medlar or common medlar, is a large shrub or small tree in the rose family Rosaceae. When the genus Mespilus is included in the genus Crataegus, the correct name for this species is Crataegus germanica Kuntze. The fruit of this tree, also called medlar, has been cultivated since Roman times.