A FORTNIGHTLY REVIEW 



OF THE 



IMPERIAL DEPARTMENT OF AGRICULTURE FOR THE WEST INDIES. 



LIBRARY 

 NEW YOBI 

 BOTANICA 



OAROeN. 



Vol. X. No. 236. 



BARBADOS, MAY 13, 1911. 



Price Id, 



CONTENTS. 



Cacao Ciiltixatiiin ami 



Shading in Trinidad... 

 C.iiiy Trucks, Bcvicc for 



Uiiloadini; 



Cotton Notes : — 



A New Eg\ [itian Cotton 

 Egyptian Cotton, New 



Type.s of 



The Briti.sh Cotton 



(.i rowing As.socialion 

 West Indian Cotton ... 

 Cypnis Origanum Oil 



Department News 



Economic Entonmldgy and 

 Health Admintstration 

 Fungus Notes : — 



Diseases l^f I 'ine-Apples, 



Partll _ 



Gleanings ... " 



Insect Notes : — 



Sugar-i'ane IJ.jreis in 



British (iiiiana 



The Frog-Hopper of the 



Sni;ar-Cane 



Jip])i .la]ipa Ha; Industry 



injaniaiea 



Market ]{epnrts 



Methods of Depollinating 

 Flower.s 



Pack. 



. 148 



U7 



l."iO 



15 1 



150 

 1.50 

 ir.l 

 140 



145 



i-'AGE. 



158 

 156 



154 



154 



153 

 160 



. 148 



Motor Tract ion in Relation 



to Agriculture 159 



Notes and Comments ... 152 



I'rizc-Holdings Competi- 

 tion in St.. Lucia ... 153 



Publications of the Impe- 

 rial De]]artinent of 

 Agriculture 152 



Rice in Uritisli Guiana ... 151 



Rubber- Planting in M;tr- 



tiMi(pie 155 



St. Vincent, Interesting 



Plant in 153 



Straits Settlements, Agri- 

 culture in 140 



Students' Corner 157 



Sugar Industry : — 



rhcSugar-Canc ni Spain 147 

 West Indian Sugar-Cane 

 Seedlings in Queens- 

 land .r. 147 



Suggestions for anin.st it ute 

 of International Com- 

 merce 153 



Trade and Agriculture of 



Barbailos, 1909-10 ... 159 



Wild Indigo as a (Jreen 



Manure 149 



Economic Entomolo<>T and 

 Health Administiatio!!. 



,j^'^r<'<>N()MIC ENTOM()L(KiV,as a .separate 



pV'7^'""'i'i<'li of applied zoology, may be termed 



a young .science. Forcer) turie.s, the large bright- 



ly coloured, or jjeciiliarly shaped insects, such ascertain 

 butterHies, moths and beetles, have attracted the atten- 

 tion of oven casual observers, and have been collected 

 and studied by fnlomologists. Few juTsons, however, 



seriousl}- applied themselves to the task of determining 

 the effect of insects, as a class, on the affairs of men 

 until within comparatively recent times, and in the 

 first instance, such application was almost entirely in 

 reference to the relations between insects and plants. 

 The discovery of the conne.\ion which exists between 

 certain insects and the dissemination of diseases of 

 animals, including man, has within even more recent 

 years, resulted in the development of an entirely new 

 branch of study and investigation. 



It is not difficult for mankind to realize the relation- 

 ship existing betvveen a plant and an insect, when for 

 example, the leaves of a plant are devoured by cater- 

 pillars. It is not as easy, however, to understand the 

 conne.xion between the bite of a mo.squito and a subse- 

 quent attack of malarial fever; but, as a result of careful 

 and patient study, the relationship in the latter instance 

 is as well proved as in the former. 



It has long been known that the abundance of 

 the insects that prey upon agricultural crops has 

 a very direct bearing on the development of newly 

 settled countries, but it has only recently been under- 

 stood how great an influence insects of other kinds have 

 on the ability of men to keep their health, while open- 

 ing up such countries, and on the health of their 

 domestic animals, on which in such circumstances so 

 much depends. 



The order Diptera, which includes those two-winged 

 insects kno^vn as flies, is ])erhaps the most important 

 group of insects, as far as the dissemination of disease 

 is concerned. Yellow fever, malaria and filaria are com- 

 municated to man by the biting of mosquitoes, which 



