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Galls (upper left and right) formed on acorns on the branch of a pedunculate (or English) oak tree by the parthenogenetic generation Andricus quercuscalicis.. The large 2 cm gall growth appears as a mass of green to yellowish-green, ridged, and at first sticky plant tissue on the bud of the oak, that breaks out as the gall between the cup and the acorn.
Many animals eat unripe acorns on the tree or ripe acorns from the ground, with no reproductive benefit to the oak, but some animals, such as squirrels and jays serve as seed dispersal agents. Jays and squirrels that scatter-hoard acorns in caches for future use effectively plant acorns in a variety of locations in which it is possible for them ...
In addition, the acorns are used as feed in extensive pig fattening (acorn fattening), such as for Iberian ham production; [25] although the Holm Oak (Quercus ilex), is preferred for this due to its sweeter fruits. [26] [27] One cork oak tree can provide 15 to 30 kg (33 to 66 lb) of acorns per year. [23]
An oak is a hardwood tree or shrub in the genus Quercus of the beech family.They have spirally arranged leaves, often with lobed edges, and a nut called an acorn, borne within a cup.
Andricus grossulariae is a gall wasp species inducing agamic acorn cup galls on oak tree acorn cups and sexual phase galls on catkins. [1] Synonyms include Andricus fructuum (Trotter, 1899), Andricus gemellus (Belizin & Maisuradze, 1961), Andricus intermedius (Tavares, 1922), Andricus mayri (Wachtl, 1879) and Cynips panteli (Kieffer, 1897).
These advocates who prefer the lean years of wild mast in the woods make a good point in that if one finds a heavily bearing apple tree or small stand of acorn-bearing oaks in a dearth year ...
Quercus velutina (Latin 'velutina', "velvety") , the black oak, is a species of oak in the red oak group (Quercus sect. Lobatae), native and widespread in eastern and central North America. It is sometimes called the eastern black oak. [4] Quercus velutina was previously known as yellow oak due to the yellow pigment in its inner bark.
Quercus insignis is generally a large tree, growing up to 30 meters in height. [1] The tree has leaves up to 15 centimetres (6 inches) and 8 cm (3 in) across. The acorns are large and distinctive, up to 8 cm in diameter, the cup covered with extended scales that give the cup a bur-like appearance. [3] It produces acorns every five to ten years.