01869naa a2200313 a 450000100080000000500110000800800410001910000180006024500610007826000090013930000140014850001440016252010110030665000110131765000110132865000110133965300110135065300140136165300130137565300140138865300120140265300120141465300140142665300150144065300130145565300130146865300160148177300580149716447091997-04-30       1959    bl uuuu     u00u1 u    #d1 aNORMAN, G. G.  aFlorida state plant board program for virus-free budwood  c1959  ap.237-242  aIn: CONFERENCE ON CITRUS VIRUS DISEASES, 1957, Riverside, California. Proceedings... Riverside, California: University of California, 1959.  aIf the candidate trees in the Florida program are a representative cross section of the State's citrus trees, and if the indexing of the Florida program is a reasonably reliable measurement of the four viruses, tristeza (5.5 per cent), psorosis (6.7 per cent), xyloporosis (72.3 per cent), and exocortis (40 per cent), these total 124.5 per cent and reflect the fact that many of the best trees obtainable in the largest citrus. Florida's answer to the is its citrus budwood program. Working against a general high level of virus incidence, in five years it has given the State 150,005 sources of psorosis-free budwood and 46,744 sources of psorosis-free and xyloporosis-free budwood of commercialy important varieties. The program will continue to select, test, than2,700 nucellar seedlings now under observation; to select, test, and compare some 400 seedling seed-source trees now under observation; and eventually to define, stabilize, and standardize the best of all these, so far as this is possible.  aCitrus  aPomelo  aVírus  aCitros  aCitrus sp  aCongress  aCongresso  aDisease  aDoencas  aExocortis  aGrapefruit  aPsorosis  aTristeza  aXiloporosis  tRiverside, California: University of California, 1959