Andricus quercuscalicis

Galls (upper left and right) formed on acorns on the branch of an pedunculate (or English) oak tree by the parthenogenetic generation Andricus quercuscalicis.

Knopper galls and acorn cupDeveloping knopper gallsDeveloping Knopper Galls

Andricus quercuscalicis is a gall wasp species inducing knopper galls.

Knopper galls develop as a chemically induced distortion of growing acorns on pedunculate oak (Quercus robur L.) trees, caused by gall wasps, which lay eggs in buds with their ovipositor. The gall thus produced can greatly reduce the fecundity of the oak host, making this gall potentially more of a threat to the reproductive ability of the tree than those that develop on leaves, buds, stems, etc. The Turkey Oak (Quercus cerris L.), introduced into Britain in 1735, is required for the completion of the life cycle of the gall. The knopper is a recent introduction to the British Isles, first arriving in the 1960s and now found throughout England, Wales and as far north as Scotland; first occurring for example in 2007 at Eglinton Country Park in North Ayrshire.

单词	Knopper galls
释义	Knopper galls 英语百科 Andricus quercuscalicis Andricus quercuscalicis is a gall wasp species inducing knopper galls. Knopper galls develop as a chemically induced distortion of growing acorns on pedunculate oak (Quercus robur L.) trees, caused by gall wasps, which lay eggs in buds with their ovipositor. The gall thus produced can greatly reduce the fecundity of the oak host, making this gall potentially more of a threat to the reproductive ability of the tree than those that develop on leaves, buds, stems, etc. The Turkey Oak (Quercus cerris L.), introduced into Britain in 1735, is required for the completion of the life cycle of the gall. The knopper is a recent introduction to the British Isles, first arriving in the 1960s and now found throughout England, Wales and as far north as Scotland; first occurring for example in 2007 at Eglinton Country Park in North Ayrshire.
随便看	budgetary saving的意思 budgetary scrutiny的意思 budgetary statement的意思 budgetary strategy的意思 budgetary structure的意思 budgetary support的意思 budgetary surplus的意思 budgetary system的意思 budgetary technique的意思 budgetary transfer的意思 budgetary turnover fund的意思 budgetary unit的意思 budgetary value的意思 budgetary viewpoint的意思 budgetary view point的意思 budget audit的意思 budget auditing的意思 budget authority的意思 budget authorization的意思 Budget balance的意思 budget base的意思 budget baseline的意思 Budget Bill的意思 budget booklet的意思 budget brigade delay line的意思