56 



essential needs are water and plant food. If irrigation 

 is used the soil can be kept moist without cultivating and 

 if the overhead system is used it will not be packed from 

 the application of water. Therefore all that is necessary 

 is to irrigate when needed and apply the fertilizer 

 broadcast without working it into the soil. The weeds 

 or leguminous crops that can be made to grow under the 

 trees should be cut frequently and left on the ground 

 preferably each time after an application of fertiliz3i% 

 so as to serve as a temporary cover for t'hat. 



Of course this system is practical only in connection 

 with irrigation or with mulching where plenty of that 

 can be had. Ordinarily cultivation must be continued 

 in order to keep the soil in good condition. Fertilizers 

 should be applied as before with the exception that the 

 quantity should be gradually increased according to the 

 crop -taken off. Thirty to fifty pounds per tree per year 

 scattered broadcast in 2 to 4 applications will pay under 

 most conditions. 



CITRUS ENEMIES AND REMEDIES 



In the natural state the citrus tree and fruit is not 

 very much subject to diseases, but under the extremely 

 artificial conditions prevailing in the majority of planted 

 groves, remedies have to be used in order to make the 

 business a success. There are three distinct troubles to 

 combat, viz : physiological, insect and fungus. 



Physiological Troubles are usually caused by unfavor- 

 able soil conditons, such as heavy soil that is too wet or 

 too rich in nitrogen. The symptoms are an outflow 

 of gum from any part -of the tree, usually from the lower 

 part of the trunk on young trees, and often from crotches 



