Susceptibility of Citrus Fruit to Bacterial Spot and Citrus Canker

Abstract

A pressurized spray (1 g/mm 2 ) that water-soaked the rind of citrus fruit was used to obtain infection by Xanthomonas campestris pv. citri, X. c. citrumelo, and other X. campestris pathovars capable of infecting leaves of the citrus hybrid Swingle citrumelo (Poncirus trifoliata × Citrus paradisi). An aggressive strain of X. c. citrumelo readily infected fruit 20-40 mm in diameter, but fruit of smaller and larger diameters were not as susceptible. Marsh White and Marsh Red grapefruit cultivars developed larger lesions over a wider range of fruit sizes compared with Hamlin and Valencia sweet orange and Orlando tangelo (...)