02109naa a2200205 a 450000100080000000500110000800800410001902200140006010000200007424501720009426000090026652014640027565000170173965300220175670000180177870000200179670000190181670000170183577300510185216329322023-05-31       1993    bl uuuu     u00u1 u    #d  a0191-29171 aGOTTWALD, T. R.  aDifferential host range of citrus and citrus relatives to citrus canker ande citrus bacterial spot determined by leaf mesophyll susceptibillity.h[electronic resource]  c1993  aThe leaf mesophyll suscptibility of 54 citrus species, and relatives to Xanthomonas campestris pv. circumelo, the cause of citrus bacterial spot, was evaluated in Hastings, Florida, during 1989 and 1990. A smilar host range of 53 citrus species, cultivars, and relatives was tested in Beltsville, Maryland, during 1991 to compare their differential susceptibility to X. c. citri, which causes citrus canker, and to X. c. citrumelo by inoculations on foliage of the same trees in replicated field plots. Field-grown trees were pruned to stimulate synchronous leaf flush for imoculatiuon by a modified pinprick method. Lesion size at 60 days (Hastings plots) or days (Beltsville plots) postinoculation was used to quantify leaf mesophyll susceptibility. For X. c. citrumelo inoculations, lesion expansion was greatest on cultivars of trifoliate orange and trifoliata orange hybrids. Smaller lesions formed on Citrus spp. such as grapefruit, sweet orange, sour orange, mandarin, lemon, and their hybrids, with the exception of Key lime, which developed lesions similar to those formed on trifoliata hybrids. Susceptibility of most citrus types to X. c. citri was more general. Lesion sizes resulting from pinprick inoculations with X. c. citri were not significantly different among Citrus spp. and hybrids, indicating a general susceptibility of leaf mesophyll. Smaller lesios generally formed on citrus relatives, including some cultivars of trifoliata orange.  aepidemiology  aField inoculation1 aGRAHAM, J. H.1 aCIVEROLO, E. L.1 aBARRETT, H. C.1 aHEARN, C. J.  tPlant diseasegv. 77, n.10, p.1004-1008, 1993.