24 



weeds, and at the end of the wet .season the plants will be high enough 

 to care for themselves in this respect. No irrigation is required, but 

 a moderate application of low-grade fertilizer is recommended. As 

 Hawaiian soils are mostl}' lacking in potash, this element should be 

 used rather freely. 



When planted as directed above, the roots will be ready for harvest 

 the following October or November. The roots will remain for a long 

 period in the soil, and if allowed to grow for two years will greath^ 

 increase in size and weight, but the increase is at the expense of the 

 starch. The two-year-old roots are often hard and fibrous, containing 

 little starch. Cassava rots quickly after l)eing dug, seldom keeping 

 for more than a week. However, as long as the roots remain in the 

 ground they will not rot unless the plants are diseased. Mice, borers, 

 and field cockroaches attack the roots, and on this account it is believed 

 advisable to treat cassava as an annual. A yield of 5 tons of cassava 

 roots per acre is about an average, although yields of from 5 to 10 

 tons may be counted on in good land with favorable seasons. 



It would seem that the cultivation of cassava for starch or glucose 

 manufacture might be profitably carried on in connection with the 

 fattening of cattle and hogs for market. The area available for the 

 cultivation of cassava in Hawaii is large, and it is a crop which does 

 not require large investments for the field operations of i)lowing, 

 planting, cultivation, and harvesting. 



PUBLICATIONS. 



During the 5'^ear three regular bulletins and four press bulletins 

 were issued. 



Bulletin No. 8, Methods of Milking, describes the Hegelund or 

 Danish method of milking and gives the result of a thirty da3^s' trial 

 of this method at the Kamehameha Boys' School dairy. 



Bulletin No. 9, Citrus Fruits in Hawaii, gives the results of inves- 

 tigations by the horticulturist of the station into the present condition 

 of citrus-fruit growing and suggests methods for the restoration and 

 development of this industr3^ In addition to describing standard 

 varieties of various citrus fruits the author calls attention to a num- 

 ber of native seedlings that are believed worth}' of more extended 

 propagation. 



Bulletin No. 10, In.sect Enemies of Tobacco in Hawaii, gives an 

 account of the insect enemies of tobacco in Hawaii and suggests 

 methods for their control. 



Press Bulletin No. 11, The Connnon Liver Fluke in Hawaii, calls 

 attention to the common occurrence of liver flukes in cattle, .sheep, 

 and other domesticated animals, and, after describing the parasite and 

 symptoms of the disease, suggests methods for its control. 



