FUNGOUS AND PHYSIOLOGICAL DISEASES. 473 



ish colored sporophores ( spore- bearing filaments). When 

 mature, they become detached and, through the agency 

 of the wind, they are carried about from one tree to an- 

 other. Falling upon the young leaves of their host, under 

 favorable conditions they germinate by sending out a deli- 

 cate, slender tube, which enters the leaves and gives rise, 

 in due time, to the well-marked and easily recognized 

 diseased condition. 



Remedies. The disease can be successfully controlled 

 by using one of the copper spraying solutions, Bordeaux 

 mixture or ammoniacal solution of copper carbonate. 

 The latter must receive the higher recommendation, as it 

 if less likely to injure the tender leaves and blossoms of 

 the lemon, but a weak solution of Bordeaux mixture is 

 likely to prove quite as efficacious, without any harmful 

 results. 



The question at once arises, "Am I not likely to do 

 injury by killing as well the parasitic species of fungi 

 that work destruction to the various scales that infest 

 the trees?" This will have to be borne in mind, and, if 

 necessary, follow the spraying with an application of 

 whale-oil soap, kerosene emulsion or resin wash. To pre- 

 vent scab, spray three times. Give the first application 

 just after the petals have fallen from the first blossoms 

 and two others inside the next six weeks. If the disease 

 gains ground on the young fruit, further spraying will 

 be necessary. Shoots of sour orange and diseased fruit 

 should be removed and burned. 



Leaf Spot. Frequently upon the leaves of citrus trees 

 round dead spots are found. These spots eventually 

 break away, leaving the leaf tattered and torn. The fol- 



