. Bollettino - Museo Statale di New York. La scienza. 744 Museo Statale di New York sono un numero sufficiente di individui in una fiele per dare una vuota molto caratteristico aspetto sul conto del colore biancastro, sporgente casi di pupa. Un gallo è rappresentato a pi. 4, fig. 1. Mosche per adulti sono stati ottenuti dal 22 maggio in poi, dal materiale ricevuto sul 10th, e il 31 un parassita è stato allevato. Questo è stato gentilmente identificato dal dr. Ashmead degli Stati Uniti museo nazionale come Tridymus salicis Nees, una specie registrate per la prima volta in America. Metallo Tridymus- lic u s Ashm. è stato allevato in piccoli numeri da Galli ha ricevuto

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. 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

Parole chiave associate all'immagine

• bookcentury1800
• bookdecade1880
• booksubjectscience
• bookyear1887