Sepi .. 191:;.] 



Propa\:^alii>)i nj bruit Tree 



i4r 



Amongst grijwrrs tht'iv is a dixersity of oijiiiiou as to the prexentiou 

 of Collar Rot. The following are some of the theories : — (Xo. i) Worked 

 trees are more susceptible than those propagated by layers or cuttings. 

 (Xo. 2) Trees worked low (l(jwn upon the stocks, particularly tho.se grafted, 

 are more subject to the disease than budded trees. (Xo. 3) Only certain 

 stocks should be used for propagation purpo.ses. (Xo. 4) X > trees should 

 be propagated from one that had, or one that has got, Collar Rf;t. If so. 

 all such trees will die sooner or later from the di.sease, arguing that the 

 disease is hereditary. After clDSf obser\ation it is found that with trees 

 growing in a certain 

 soil, locality. ])osi- 

 tion, and rtceiving 

 certain treatment, 



these theories to some 

 extent are sound ; 

 but if the same 

 class of trees is 

 grown under different 

 conditions with re- 

 gard to .soil, locality, 

 >S:c. , opposite results 

 are obtained. Take 

 the stock theory. 

 Trees worked upon a 

 certain stcnrk, grown 

 in a certain soil, 

 with a free natu- 

 ral drainage, receix - 

 ing no artificial ir- 

 rigation, thrive well 

 and remain verv free 

 from the fungus 

 diseases mentioned. 

 But when grown 

 under artificial irriga- 

 tion, upon another 

 class of .soil, the 

 trees become diseased 

 or die out. X'o hard- 

 and-fast rules can be 

 laid down from anv 

 of the.se theories. 



The chief factor 

 in growing and pro- 

 pagating citrus trees fig. 

 is to have a thorough 



knowledge of the class of .soil to be planted, the locality, and condi- 

 tions under which trees are to be grown, and the class of propagated 

 tree whether suited or not to such conditions. When propagating citrus trees 

 in the nursery row, great care should be taken that the soil is a friable 

 one, naturally or easily drained, and that over-irrigation is not practised, 

 as the chief causes of developing the fungus di.sea.ses mentioned are bad 

 drainage, unsuitable soils, and excessive irrigation. With the citrus tree 



"4- 



-LEMOX TREE ATT.ACKED BY COLLAR ROT. 



