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■Section I. Introduction. Page. 



Trinidad and its Sugar liidustiy ... ... .. 11 



The Blight and the Loss it Causes ... ... ... IS 



Invt'stigatioiis ujj to 1916 .. ... ... 14 



The Search for Parasites, 1916-1917 ... ... ... 16 



Investigations from 1917 to 19'20 ... ... 18 



Acknowledgments ... .. ... ... 18 



Skction II, The Nature of the Blight. 



General Symptoms .. ... ... ... 20 



Damage to Leaves ... ... ... ... 20 



Damage to Stem .. ... ... ... 22 



Damage to fioots and Root .Stock .. .. ... 24 



Effect on Juice ot Oane ... .. ... ... 24 



Final Conditi(jn of Damaged Canes .. .. ... 25 



Recovery ... ... .. .. ... 25 



Variation in Intensity of Blight ... ... ... 27 



Similar Injuries from other Causes ... .. .. 27 



Page 



Ruot Disease .. .. 27 Mosaic Disease 29 



Sereh Disease... ... 28 Insect Borers... 29 



Leaf Spots ... ... 29 



Section III. The Hictory of the Blight in Trinidad. 



Early Years 1862-1905 ... .. ... .. 30 



The Recent Series of Attacks 1906-1919 .. ... 32 



Discussion ... ... .. .., 42 



Section IV. Froghoppern in other Countrie'< and Legislation Against 

 Further Spread. 



Section V. The Trinidad Froghopper. 



Nomenclature and Systematic Position ... ... 53 



Distribution and Origin ... ... ... ... 53 



Adult : Description and Variation ... ... ... 54 



Proportion of Sexes .. ... ... ... 55 



Anatomy .. . . ... .. ... 56 



Habits ... ... .. .. ... 56 



The Egg ... ... ... .. ... 58 



The Nymph : Description and Moults ... ... 59 



Habits .. .. ... ... ... 60 



The Froth... ... ... .. .. 60 



Food Plants ... .... ... ... .. 61 



Life Cycle .. ... ... .. ... 62 



Other Frughoppers in Trinidad ... . ... 63 



Page. 



Tomaspis rubra ... 63 Tomaspi.s sp ? ... (54 



T. pubeseens .. 6."> Clastoptera laenata 04 



T. guppyi ... 64 Cephisus sp. ... 64 



