100 CACAO 



Thread Disease was noted by Lewton-Brain as occurring 

 in St. Lucia in 1904. It was afterwards shown at the 

 Agricultural Conference in Trinidad in 1905, and was again 

 found in 1907 in the Sangre Grand district of Trinidad 

 by the author. None of the specimens were sufficient for 

 determination. In 1909 specimens of Pellicularia were 

 found in the St. Anne's district of Trinidad by A. E. Collens, 

 were determined at Kew, and subsequent examinations 

 proved this fungus to be not unconmion on rose plants 

 in gardens, but up to date (1911) it cannot be said to be 

 prominent. The determination shows that the specimens 

 collected in 1907 may, with some certainty, be also referred 

 to Pellicularia. One of the species of thread blight proved 

 on being cultivated to belong to a species of Coprinus. 

 Kew references to Pellicularia are to be found in the 

 Kew Bulletin, 1893, p. 67. It is stated that it has been 

 recorded from Jamaica, that it appears to belong to South 

 America, and that considerable loss has been sustained in 

 India from its attack. It appears to be readily controlled 

 by spraying with Bordeaux mixture after cutting away 

 the most infected portions. It has been seen on crotons 

 and other garden plants as well as roses. A form of thread 

 disease has been found on shade trees, and the dying 

 branches falling on cacao-trees below have been observed 

 to infect them. 



No. 7. " Horse Hair Blight." Marasmius equicrinus. 

 Mull. — This fungus appeared in 1907 in the nurseries of 

 the Botanical Department, where it was found covering 

 young cacao plants growing in bamboo joints. So far no 

 special damage has occurred, but it is an enemy whose 

 action and progress should be very closely watched, as it 

 is known to do special harm in many parts of the world. 



No. 8. " Witch's Broom." Colletotrichum luxificum 

 n. sp. {Exoascus theobromce, Bitz Bos.). — This is a disease 

 present on the mainland of South America, but which, 

 so far, has not been detected in the West Indies. It appears 

 to be a disease of a destructive character, and a close watch 

 is being kept and measures adopted in order to prevent 



