. Bulletin - New York State Museum. Wissenschaft. 744 NEW YORK STATE MUSEUM sind genügend Personen in einem Gall eine leere ein sehr charakteristisches Aussehen aufgrund der weißlichen, Projektierung pupal Fällen zu geben. Ein Gall ist an pi vertreten. 4, Abb. 1. Nach Fliegen waren von Mai 22 Vorwärts, aus Material auf dem 10., und in der 31. Ein parasit wurde gezüchtet. Dies wurde freundlicherweise von Dr. Ashmead der United National museum Staaten als Tridymus salicis Nees, einer Art erfasst zum ersten Mal in Amerika identifiziert. Tridymus Metall-Lic u s Ashm. wurde in dem kleinen Zahlen von Galle erhalten gezüchtet

• Bildanbieter: Book Worm / Alamy Stock Foto
• Bild-ID: RGK7N5
• Dateigröße: 7,1 MB (692,5 KB Komprimierter Download)
• Freigaben (Releases): Model - nein | Eigentum - nein
• Format: 1245 x 2006 px | 21,1 x 34 cm | 8,3 x 13,4 inches | 150dpi

Weitere Informationen

Dieses Bild ist ein gemeinfreies Bild. Dies bedeutet, dass entweder das Urheberrecht dafür abgelaufen ist oder der Inhaber des Bildes auf sein Urheberrecht verzichtet hat. Alamy berechnet Ihnen eine Gebühr für den Zugriff auf die hochauflösende Kopie des Bildes.

Dieses Bild kann kleinere Mängel aufweisen, da es sich um ein historisches Bild oder ein Reportagebild handel

. Bulletin - New York State Museum. Science. 744 NEW YORK STATE MUSEUM are enough individuals in one gall to give an empty one a very characteristic appearance on account of the whitish, projecting pupal cases. A gall is represented at pi. 4, fig. 1. Adult flies were obtained from May 22 onward, from material received on the 10th, and on the 31st a parasite was bred. This was kindly identified by Dr Ashmead of the United States national museum as Tridymus salicis Nees, a species recorded for the first time in America. Tridymus metal- lic u s Ashm. was bred in small numbers from galls received in the spring of 1902 and Polygonotus salicicola Ashm. was reared in numbers. This abundance of parasites leads us to hope that natural agents will soon control this pest. Twigs received June 3, 1901, directly from the willow plantation had disclosed some flies, showing that the period of emergence extends over a number of days. Mr Peck further states that Mr Wil- son has been in the habit of opening cases of imported stock near the block of in- fested willows; so it would be comparatively easy for them to become infested. Carpenter moth, Prion- o x y s t u s robiniae Peck. This is a serious enemy to maple, oak and ash trees in certain sections of New York state. Its destructive work at Ogdensburg was brought to my attention by Miss Mary B. Sherman of that place, and through her some inter- esting examples of the borers' work in sugar mapletrees were secured. One third of a section of a tree about 15 inches in diameter was fairly riddled with the large burrows of the caterpillar of this insect. It was so abundant as to. Fig. 17 Work of carpenter moth caterpillars, pupal case and adult (original). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. New York State Museum; New York State Museum. Albany : New York St

Stockbilder mithilfe von Tags suchen

• bookcentury1800
• bookdecade1880
• booksubjectscience
• bookyear1887