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21.
A severe decline of alder associated with an undescribed Phytophthora species was identified for the first time in England in 1993. No generalized decline of alder was reported in France before 1990. The first diebacks and mortalities of common alder were observed at the beginning of the 1990s, but the so‐called alder Phytophthora was not isolated in France until 1996. First, a synthesis about alder declines that were known in France before 1995 is presented. Then, a survey was established in north‐eastern France; 108 sites were visited and the alder Phytophthora was isolated from 57 of them. All the main rivers were found to be affected and damage levels are significant along some of them. The frequency of the alder Phytophthora and other fungi isolated from declining alders is discussed. Finally, information on other alder declines in France is presented region by region, and a map summarizes the known distribution of the disease. The alder Phytophthora is quite common and widespread in France, with western and north‐eastern France being especially affected; however, the number of diseased or dead trees varies greatly from one site to another. All records are from Alnus glutinosa; other Alnus species were seldom seen in the surveys. 相似文献
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TED S. STASHAK D.V.M. M.S. DANIEL J. YTURRASPE D.V.M. PH.D † 《Veterinary surgery : VS》1978,7(2):48-55
The selection of a suture material, in the past, was based primarily on habit, guesswork and physical properties. This is understandable because there was a limited number of materials to select from and the interaction of suture material with tissues was not understood. 相似文献
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Fabrício Packer Gonçalves Eduardo Sanches Stuchi Simone Rodrigues da Silva Eduardo Toller Reiff Lilian Amorim 《Scientia Horticulturae》2011
The production and commercialization of citrus seedlings inspected and produced in protected screenhouses has become mandatory in São Paulo State, Brazil since January 2003. This law was intended to avoid the dispersion of Citrus Variegated Chlorosis (CVC), disease caused by Xylella fastidiosa. Our objective was to compare the yield over 8 years of ‘Natal’ sweet orange trees grafted onto Rangpur lime obtained from healthy nursery plants and from plants artificially inoculated with X. fastidiosa. Yield was evaluated in an orchard planted in February 1999 with two treatments: (i) trees from healthy nursery plant, and (ii) trees from plants artificially inoculated with X. fastidiosa. The mean yield was 21% higher in trees from healthy nursery plants, as compared to trees from inoculated nursery plants. This difference represents a gain of approximately 203 boxes of 40.8 kg each, considering a planting density of 550 plants per hectare. 相似文献
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WALTER E. WEIRICH D.V.M. PH.D. WILLIAM E. BLEVINS D.V.M. M.S. 《Veterinary surgery : VS》1978,7(1):2-7
Twelve dogs and one cat were operated to close a ventricular septal defect. The method of patient selection, associated lesions, techniques used to correct the defect and significance to the total population of small animals with congenital lesions is discussed. Ten of 13 animals survived surgery. When indicated, this procedure can be safely performed to correct ventricular septal defect. 相似文献
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The use of an air powered automatic trephine (3-M Perforator) for performing ventral decompression of the canine spinal cord was evaluated based on its use in 5 experimental dogs. The problems of hemorrhage and spinal cord trauma encountered in this study are discussed and indicate little practical application of the instrument in decompression from the ventral approach. 相似文献
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