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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).
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.
Leaves may begin to shed in late winter, or when new leaves emerge in spring. [7] Fruit: oblong acorn that is 1 ⁄ 2 to 1 in long. Acorns have bowl-shaped caps that cover one third of the nut. Acorns usually mature in autumn. The quantity of acorns produced can vary year to year, producing about 32,000 acorns one year and very few the next.
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 to germinate and thrive. Even though jays and squirrels retain remarkably large mental maps of cache locations and return to consume them, the odd acorn may be lost, or a jay or squirrel may ...
Acorns per pound range from 200 to 750. Acorns mature from August to November of the second year. Trees begin bearing acorns when they are about 25 years old, and optimum production is reached when they are between 50 and 75 years of age. Good acorn crops are frequent, occurring at 1- or 2-year intervals, with light crops in intervening years.
A plant derived from the asexual vegetative reproduction of a parent plant, with both plants having identical genetic compositions. coalescent Having plant parts fused or grown together to form a single unit. cochleariform Concave and spoon-shaped. cochleate Coiled like a snail's shell. coenobium An arranged colony of algae that acts like a ...
Abscission (from Latin ab- 'away' and scindere 'to cut') is the shedding of various parts of an organism, such as a plant dropping a leaf, fruit, flower, or seed. In zoology , abscission is the intentional shedding of a body part, such as the shedding of a claw , husk, or the autotomy of a tail to evade a predator.
The acorns are usually sessile, and grow to 15 to 25 mm (1 ⁄ 2 –1 in) in length, falling in early October. In spring, the young leaves are delicate, silvery pink, and covered with a soft blanket-like down. The petioles are short, and the clustered leaves close to the ends of the shoots are pale green and downy, resulting in the entire tree ...