32 



great while ago from an introduction of mango plants from Guanta- 

 namo, the only other point- of infection now known. 



The limits of this infestation appear to "be definitely ascertained 

 and moreover inspectors are constantly following it up. The few 

 Known (12) existing points of infestation are being sprayed and will 

 be watched from now on. 



Letter from Wilmon Newell to J. R. Johnston, dated Dec. 29, 1916. 



Please accept my, hearty thanks for your kindness in writing me 

 under December IBth regarding the occurrence of the spiny citrus 

 white fly in a portion of the city of Havana. . . « 



So long as efficient work is being done by your Commision tor 

 keeping this infestation under control and so long as shipments of 

 fruit and other products from the infested section are not being sent 

 into Florida, I do not believe it will be necessary for our State Plant 

 Board to impose any quarantines against Cuban plants, particularly 

 on account of the occurrence of this pest in the Island. • 



I will of course appreciate your keeping me informed from time 

 to time as to any developments, especially in event the pest is found 

 to extend over a larger area and to such an extent as to create a 

 danger of its being introduced into Florida. 



REPORT 



concenung the work carried out by the Senor Emilio D. Cassd. on the 

 destruction of the Marabu (Dichrostachys nutans). 



On May 22rid, 1916, there was sent to me a letter of Sr. Emilio 

 Cassi, as follows: "Hon. Sr. Sec. of Agriculture, Habana. — Senor: — 

 The writer has for some time carried on studies and experiments to 

 destroy the plant" called Marabu, that has invaded such a large 

 territory, and has caused such great damage. 



The experiments realized up to date have been carried out using 

 chemical liquids, vines of the Family Convolvulaceae, hymenomycetous 

 fungi, various bacteria and certain insects, and the results forescast 

 a positive success not far off; 



But still it is necessary to conclude various experiments that 

 really may be considered as proofs, and I find myself without the 

 necessary resources to carry these to a successful conclusion, since I 

 have spent everything in my first ejcperiments. 



If you could secure from that Department which you with such 

 great faith and self-sacrifice direct, some aid, without doubt I could 

 bring my work to a successful end, facilitating in this manner, to the 

 agriculturists of Cuba, sure scientific means of eliminating from their 



