]'AH FROGIIOPPER BLIGHT OF 8UOAR-CANE, 



Sweet Potatoes are also a good non-leguminous rotation crop and in 

 many cases the cane plants may be planted between the sweet potato 

 plants so as to lose no time. 



Cassava, Cotton and Bananas are other plants which might be 

 experimented with on a larger scale to find suitable conditions under 

 which they could be grown. 



The following rotations are suggested as those most likely to 

 improve the condition of the soil and render the canes less liable to 

 attack by froghoppers or other insects and fungi. 



(I.) Catch-crop rotation for good lands. 



Month. J. F. M. A. M. J. Jy. A. S. O. N. D. 



llatoon — > < — Land — > < — Feas, beans — > li < — Plant 

 canes cut ploughed or sweet canes. 



potatoes 



The canes should be planted^befcween the sweet potatoes. 



(II,) Short rotatiort for fairly good lands not jjarticidarly liable 

 to froghopprr and mot disease. 



Month. J. F. M. A. M. .1. Jy. A. S. O. N. D. 



Ratoon — > < — Land — > < Yams, or beans 



canes ploughed followed by 



> I < — Crop plant canes. 



In this no cane crop is lost. 



sweet potatoes. 



(III.) Long rotation for poor lands. 



Month. J. F. M. A. M. J. .Jy. A. S. O. N. D. 



Ratoon — > < Yams or cassava 



canes cut 



Cow peas or sword Canes 

 > < — beans ploughed in — > |j < — planted again- 



as stock food. 



In this rotation one crop of cane is lost in each c^cle. 



The number of ratoons cut would depend on the condition of the 

 field and the crops produced, but it would be well to abandon second 

 ratoons on poor lands until they have been worked up into better 

 condition even if there is no immediate indication of blight. 



lu all discussion of rotations in Trinidad the final solution will 

 depend largely on the labour supply, but in order to keep the 

 poorer land under cultivation, some form of rotation will have to be 

 adopted and it is for the planter to experiment on methods of implemen- 

 tal cultivation etc., whereby the result may be obtained with the least 

 possible outlay. 



DIRECT CONTROL METHODS. 



Destruction of Froghoppee Eggs. 



The eggs of the froghopper are in the semi-decayed moist leaf 

 sheaths of the cane near the ground, in the coiTesponding parts of the 

 grasses that grow in the cane fields, and in the ground itself. Up to the 



