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- W2339979928 abstract "The use of botanical relatives of the avocado as rootstock for the several commercial varieties grown in California was considered by early investigators as a reasonable approach to the solution of such problems as physiological incompatibility, low temperature susceptibility, ultimate tree size, resistance to soil-borne or other diseases, and possibly to problems of fruit set and development. Anticipation of experimental work in this field has resulted in the collection of several species of Persea and closely related genera such as Laurus, Umbellularia and Cinnamonum, members of the family Lauraceae. These materials were established during the period 1925-45 at the University of California Agricultural Experiment Stations at Los Angeles and at Riverside from which several investigations on and testing of the genera and species eventually were forthcoming. Persea Schiedeana was introduced into California with hope that it might prove resistant to the soil-borne fungus Phytophthora cinnamomi. While the testing techniques used by Zentmyer (11) indicated a slight resistance to and the field recovery of Phytophthora cinnamomi from P. Schiedeana in Guatemala (8,10) nevertheless the tentative conclusion by most investigators at the time was that problems of propagation and lack of demonstrated or marked disease resistance did not warrant continued consideration of the materials on hand as a rootstock source. The coyo has been known in California for many years, but has never attained any degree of importance. Importation of coyo seed from several sources was made on several occasions (7,8,9,12) primarily in an attempt to ascertain their tolerance to the Phytophthora cinnamomi fungus and general grafting compatibility. Apparently these coyo forms exhibit no marked tolerance to the root-rot organism to judge from the limited number of seed sources tested. The budding affinity with commercial varieties of avocado was found to be satisfactory in the few trials attempted (3,5). Several scions were topworked onto older established Guatemalan and Mexican rootstock trees at Los Angeles and at Carpinteria. There were a few fruits which resulted from the latter grafts but the fruit quality proved inferior, hence no further consideration has been given to this species either as a rootstock or fruit source in California." @default.
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- W2339979928 date "1973-01-01" @default.
- W2339979928 modified "2023-09-26" @default.
- W2339979928 title "PERSEA SCHIEDEANA, THE COYO, A POSSIBLE ROOTSTOCK FOR AVOCADO IN SOUTH AFRICA" @default.
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- W2339979928 hasPublicationYear "1973" @default.
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