Esta edición ISBN ya no está disponible.Ver todas las copias de esta edición ISBN.
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1913 Excerpt: ...parasitized. The dead caterpillars not infrequently contain the puparia of Tricholyga, when this parasite happens to be common in the locality from which the shipment originated. Under such circumstances they are placed in tube cages for the emergence of the flies. If Tricholyga is not present in the boxes in the form of free puparia the dead caterpillars may as well be discarded, since it is only very rarely that any other tachinid pupates in this manner. Pupae, both living and dead, nearly always contain a considerable number of the larvae of Blcpharipa scutellata. They are, therefore, placed over damp earth in order that the larvae may pupate under natural conditions. Other tachinids may occur in the pupa, but never in anything but insignificant numbers. GIPSY-MOTH WVM. It would seem as though it ought to be an easy matter to import the pupae (Pl. VI) of the gipsy moth in good condition, but for reasons which are not altogether clear in every instance the vast majority of the importations of pupae have been worthless, or worse than worthless, since the handling of worthless material involves an additional waste of labor. Too often the cause of failure is directly and obviously the result of careless packing, and the number of lots of pupae which have been received packed with the care which is essential to success is very small. The most successful shipments ever received were carefully packed in slightly dampened sphagnum moss, so arranged that the individual pupae rarely touched each other. One or two successful importations thus received in 1908 were used as the basis for future instructions to collectors, and in every instance in which the directions were carefully followed in 1909 the results were equally good. In 1910 additional material apparently...
"Sobre este título" puede pertenecer a otra edición de este libro.
(Ningún ejemplar disponible)
Si conoce el autor y el título del libro pero no lo encuentra en IberLibro, nosotros podemos buscarlo por usted e informarle por e-mail en cuanto el libro esté disponible en nuestras páginas web.Crear una petición