CONTENTS
 PAGE
 INTRODUCTION ...................... ---... -- ---- -- ----- 5
 ACKNOWLEDGMENTS .....--- -------..... .. ...... --..-... ....-..... ---- -----....-- --------- 6
 GENERAL CONSIDERATIONS IN THE PREVENTION OF CITRUS DISEASES....... 7
 Grove location ---------...--......-.-. --------.---------- -- --------...........- 7
 General care ......-....... .....-- .--- ..-- .--...8.------ ............. 8
 Cultivation --.......----..--- ...... ......-----------............. 10
 Importance of organic matter in the soil-..........-.....--........ ----... 11
 Fertilization .....-- ....--..--....- ..-- ..- .......--- ----.. ..--.......-- 12
 Soil m oisture ......... ......-- ...--....... -.....-....... 13
 Importance of disease control ....................... ....................... 14
 Spraying ...........................-.....-----..---- ..- ..--.. ..--- -- --- -..... 15
 FUNGICIDES AND THEIR PREPARATION............. ..... ........................ 16
 Bordeaux mixture and bordeaux-oil emulsion................................. 17
 Preparing the stock solutions ...............------- -- -----............ 18
 M making the m ixture ................. .........- ..... .... ............... 18
 Practical field methods for large spraying operations.................. 20
 Lime-sulphur solution ....-------........... ---...................-...... 21
 DISEASES CAUSED BY PARASITIC FUNGI AND BACTERIA................................ 23
 Diseases attacking trees, parts of trees or fruit but not causing
 fruit decay ..... .............................. ............ ... 23
 Melanose .....- ----...........------- ................. 23
 Scab ----------.----..............---------......- 33
 C anker ......... .... .. ..... .. ........................... .... ............. 40
 Foot rot ......-........... ----..........--....-............ 46
 Clitocybe mushroom root rot .................................. ........ .......... 56
 Diplodia collar rot and other basal bark diseases............................ 65
 Gummosis ..--........-...... ...---.----------------- 66
 Psorosis ................... ................. ..... ... .... .... 74
 Scaly bark or nail-head rust ................................ ... 84
 Withertip and anthracnose ............. -------------.... .. ... ---- 91
 Diplodia twig and branch dieback. ................. -----............... 101
 Sphaeropsis knot .............. ...................... 104
 Damping-off ....------..........--...- .---......... 107
 Sooty mold ........--.................. -.............. 108
 Felty fungus .---...............-----------------------. 110
 Flyspeck and sooty blotch ...........------...... -- .. --------- 110
 Thread blight ...-..............------....... ....... 112
 Diseases causing fruit decay ....----......------................ 113
 Blue and green mold decays .................................... 113
 Stem-end rot ......--..-_- .. -. .......... .. ..... 118
 Black rot ......... ------.......... ------- ------------... 126
 Stylar-end rot of Tahiti limes .......... ---------------................ 128
 Charcoal rot of limes ........................................ ----------- ... 130
 Aspergillus rot .............. .... .---------. ..... .. ..... .....----- ..---- 130
 Decay of citrus fruit in transit and on the market ................... 131
DISEASES AND INJURIES DUE TO NON-PARASITIC CAUSES........................... 138
 Diseases due to physiological or unknown causes ................................ 138
 Exanthema or dieback ................. ....-------. ..... 138
 Mottle-leaf or frenching ------...--......~................. 150
 Fruit-splitting -.................. ...... -...... ... 158