28 



Gymnosporangium Macropus. 



1. Cedar-apple with gelatinous horns. 2. A spore from a gelatinous horn 

 germinating and producting four infection spores, one of which is de- 

 tached. (\'er3' highly magnified). 3 and 4. Apple leaf and fruit with 

 the cluster-cup stage of the fungus. 



We were speaking of the spray applications, for us usually two 

 in number, made when the petals fall and two weeks later, that are 

 timed particularly for Scab control. These, let us remember, will 

 also be more or less effective for Cedar or Orange Rust on leaves 

 and fruit, for Blotch on leaves and fruit, for Sooty i\Iold on fruit, 

 and for Black Rot Spot (Sphaeropsis and Frog Eye Spot (Illos- 

 porium) on leaves. The diluted lime-sulphur material seems to be 

 satisfactorily eff'ective against these troubles, and is preferred to 

 Bordeaux mixture. Where Blotch and Black Rot prevail, care 

 should be taken to cover twigs and limbs at one of the sprayings ; 

 and as thorough as possible pruning out of affected woody parts 

 should be practiced. 



Sometimes, when cool, moist Aveather prevails, there may be a 

 midsummer outbreak of Scab; and usually the leaf spotting fungi 

 and Sooty IMold and Blotch of the fruit continue to cause infec- 



