A FORTNIGHTLY REVIEW 



OF THK 



LIBRAI 



NEW Y( 

 BOTaNK 



IMPERIAL DEPARTMENT OF AGRICULTURE FOR THE WEST INDIES. o.kue 



Vol. IX. No. 21.5. 



BA.UR.\DO.S, .JULY 2.3, 1910. 



Prick Id. 



CONTENTS. 



Page. 



Page. 



Birds. Ftodin- H;il.its 



..f ... L'31 



Cacao Cultivation in tlio 



Geiiuan Col<mii-s ... 228 



Cacao Pods, Packinj/; anil 



Tr.ansportiiii; 228 



Caiii|)lioi'. Viclil of. friim 

 DitfiTt'iil Parts ..f t la- 

 Plant 233 



Cotton-Growing from Cut- 

 tings and by Budding 232 



Cotton Notes : — 



Crossing Sea Island and 

 Native West Indian 

 Cotton 2.30 



The l'ros|)ects of Egypt- 

 ian Cotton-Uro« ing... 



West Indian Cotton ... 



Department News 



Eui)liorl)ia Latex fia- Pre- 

 venting Corrosion ... 

 Fow's, Tuliereulosis in ... 



Fungus Notes : — 



Cacao .Spravingin Triiii- 



dad ...' 



Gleanings , 



230 

 230 



229 



232 

 237 



238 1 

 230 : 



Insect Notes : — 



Tile .Acarina or Mites, 



Part III 234 



.J.na, Tiaileand Commerce 



of. 1909 239 



Lime-Sulphur Wash for 



use on Leaves 233 



Market Reports 240 



Notes and Comments ... 232 

 Plant Diseases, Some Con- 

 siileratii ms in the Treat- 

 ment of 22.5 



Plants, Action of Mangan- 

 ese .Salts on 232 



Prickly Pear, L'tilization 



..f the 23.5 



Pvul)l>er, Varieties of ... 231 

 St. Viment Agricultur.il 



Society 229 



Sicily. Tradeand Commerce 



of. 1909 23:5 



Students' Corner 237 



.Sugar Industry • — 



The Manufacture of 



White Sugar in Java 227 

 Tobacco Industry in the 



United SUtes 2S3 



West Indian Products ... 239 



Some Considerations in the 

 Treatment of Plant Diseases. 



NE of the most importimt considerations 

 which enter into the tre.itment of pi uit 

 diseases is the relation between the expense 

 it involves and the return in additional profit which it 

 is likely to yield. This relation is often dependent 

 on several factors of a purely local nature, so that the 

 correct solution of the problem, in any given inst.uice, 

 depends on usefid co-operation between- the plai.ter 



and his advisers. It is with the object of indicating 

 in what ways this co-operation is specially impor- 

 tant that the following matters are brought under 

 discussion. 



When any crop is attacked by dise.-ise of a fungoid 

 origin, the nature of such attack may be of two kinds: 

 either it may be epidemic and destroy, or threaten to 

 (iestroy, the whole crop in the course of a short space 

 of time, or it may cause the steady loss of a certain 

 percentage of the produce during a long period: that 

 is, it may be endemic. In the second case, there is 

 always to be taken into consideratioti the additional 

 danger of such diseases becoming suddenly epidemic. 



The general nature of the advice given by a plant 

 pathologist, or mycologist in dealing with disease lalls 

 umlerthree heads. Firstly, total destruction of the dis- 

 eased plants: secondl}', the application of remedial and 

 preventive measures to diseased plants or to plants 

 likely to become diseased: thirdly, permitting the 

 disease to take its course unchecked. The first two 

 kinds of advice may be given in dealing with either 

 epidemic or endemic diseases. The third is only applic- 

 able in the case of such endemic diseases as do so little 

 harm that the expense involved in checking them is not 

 compensated for by the additional profits obtainable 

 from the crop. 



In the case of the sudden outbreak of an epidemic 

 on any estate, the best advice that can be given is fre- 

 quently for the total destruction of the infected plants, 

 as, although it necessarily involves a certain amount of 

 loss, yet if the trouble is treated at an early stage, this 

 loss is not serious in proportion to that which would be 

 sustained if the whole crop was destroyed. In this 



