DISEASES OF CITRUS IN FLORIDA

 By ARTHUR S. RHOADS AND E. F. DEBUSK'

 INTRODUCTION

 A strong demand exists for a publication covering the gen-
 eral field of citrus diseases occurring in Florida. While this
 demand was fulfilled to a large extent by Bulletin 150 of this
 Station, published in 1918, this publication is now out of print
 and, as might be expected after the lapse of 13 years, largely
 out of date. Since the appearance of that bulletin, many opinions
 have changed and much new information has been published in
 various periodicals and books, most of which are not available
 to the average citrus grower. However, regardless of how much
 information may be scattered through the literature, this in-
 formation is of practical value to the citrus grower only when
 brought together and a summary of the authentic informa-
 tion on each disease presented in clear and concise form.
 The present bulletin has been designed to present to growers,
 in logical sequence and standardized form, information concern-
 ing the distribution and economic importance, appearance, cause
 and control, so far as known, of all Florida citrus diseases on
 which definite information exists, with the exception of drought
 injury, blight or chronic wilt, and water injury.* In this bulletin
 the term "disease" is considered in its broadest sense and in-
 cludes the non-parasitic troubles and injuries from various
 causes, except where known to be due to insects. This has
 been considered advisable, since the lesions or effects produced
 not only affect the health of the trees but are frequently mis-
 taken for those due to parasitic or other diseases or because
 they may serve as contributory factors for infection and de-
 velopment of more or less parasitic organisms.
 The information given is presented with the view of aiding
 the grower to better identify citrus diseases, to realize more
 fully their importance, and to employ the best known methods
 'Associate plant pathologist, Florida Experiment Station, and citrus
 pathologist, Florida Agricultural Extension Service, respectively.
 *In view of the fact that it is planned to treat these troubles that are
 contingent upon deficits or excesses of soil moisture, or combinations of
 the two, in considerable detail in a special publication, they have been
omitted purposely from this bulletin.