2 TBINIDAD AND TOBAGO BULLETIN. [XVIIL 1. 



In addition to the leaves and the tender shoots, the flowers (i) and 

 young fruit are very susceptible to attack, and on this account, the 

 disease causes a great loss of fruit. If the flowers are attacked, they fall 

 from the tree without setting fruit. When young fruits are attacked, 

 they show a rough scaby appearance and become cracked, and generally 

 fall from the tree in two or three weeks. 



After the fruits have become half-grown, they seem to be immune 

 to further attack. Full-grown fruits, after having fallen to the ground, 

 however, may be attacked through wounds, and the fungus in this way, 

 probably causes a good of rotting of the fruit from the time of gathering 

 until it reaches the factory. 



TREATMENT OF THE DISEASE. 



As this disease became epidemic last 3'ear, it is quite pi'obable that 

 under favourable conditions, it may do even more damage this year, 

 and every one should be prepared to combat it. Fortunately, it is 

 comparatively easy to treat. If possible, all the dead wood and diseased 

 leaves should be collected and burned during the dry season, and as 

 soon as the trees begin to make their new growth after the rains begin, 

 they should be thoroughly sprayed with Bordeaux mixture 4-4-50, to 

 every gallon of which should be added a sticker, made as follows : — 



Resin ... ... ... ... ... 2 pounds. 



Washing soda (crystals) ... ... ... 1 pound. 



Water ... ... ... ... ... 1 gallon. 



Mix, and boil until the preparation is a clear brown, about one hour. 

 This will make the Bordeaux spread and stick to the glossy 

 surface of the lime leaves. After the first application has been made, 

 the trees should be watched very carefully as time goes on, to see 

 whether or not the new growth is becoming infected. If infections are 

 found, it would be advisable to make another application of Bordeaux 

 mixture. The number of applications necessary can only be judged 

 according to the climatic conditions throughout the growing period. 



NOTES ADDED. 



The above article was written by Mr. Rorer before he left for Ecuador. 

 The following notes are also of interest. 



In the Report of the Porto Rico Agricultural Experiment Station for 

 1917, pp. 29-30, reference is made to what is apparently the same 

 disease : — 



" The wither-tip fungus {C olletotrichum gloaosporioides) has been 

 quite active during the past year, partly because of lowered vitality 

 in the trees from lack of fei'tilizer. A few cases have been noted in 

 which the initial injury results from poor drainage, impervious subsoil, 

 or use of sprays. The damage done by this fungus to vigorously 

 growing trees is very slight." 



In the course of a visit paid on one day by Mr. Urich and myself 

 to three lime estates in Trinidad, with very similar climatic conditions, 



(1.) The disease is for this reason also known as Blostom-'jlight. (Ed.) 



