33 



elements. In the case of the Tangerine and Mandarin, where 

 a larger size is usually desired, a heavy dressing of nitrogen 

 fertilisers would favour this end, and is not objectionable 

 unless carried to excess. 



(6.) Fertilisation has an important bearing on diseases. 



(7.) Die-back, a serious malady, is in all probability the 

 result of overfeeding with nitrogenous manures from organic 

 sources. These manures, if used at all, should be applied with 

 great caution. 



(8.) Foot rot, although not primarily due to improper 

 methods of fertilisation, is no doubt considerably influenced by 

 this cause. 



(9.) Insect diseases are also apparently influenced by the use 

 of fertilisers, organic manures rendering the trees more liable 

 to injury fiom this source than chemical fertilisers. 



' >X< " 



(extract.) 



Method of propagating the Orange and other Citrus fruits. 

 By Herbert J. Webber, Assistant, Division of Vegetable 

 Physiology and Pathology, U.S. Department of Agriculture. 



STOCKS. 



The kind of stock used for budding has considerable in- 

 fluence on the health, vigor, and productiveness of the tree. As 

 some stocks will not do well on certain soils, and some varieties 

 grow well only on certain stocks, it is desirable that the stock 

 used for planting any given tract be carefully considered. The 

 orange and pomelo, or grape fruit, are commonly budded 

 on sweet orange, sour orange, lemon, or pomelo stocks. 

 If planting is to be done on rich, moist lowlands 

 (low hammocks, and flat woods) which are subject to 

 foot rot, or mal-di-gumraa, stock which is immune from 

 this disease should be used. Sour orange stock is the most 

 resistant variety that has been found, and usually gives the best 

 results. Pomelo, or grape fruit stock, is also quite resistant and 

 is probably the best stock in foot-rot regions where the soil is 

 droughty at certain seasons of the year. It is a more vigoi-ons 

 grower than the sour orange and resists drought better. Foot 

 rot is common also on some flat woods and high pineland soils 

 which are dry and well drained, and in such localities the 

 pomelo is probably the best stock for general use. In the case 



