I04 



SPRAYING CROPS 



turn give rise to more spores/' The fungus passes 

 the winter by means of the late summer spores which 

 remain attached to the fallen leaves. 



Remedy — "Spray first with the Bordeaux mixture 

 when the leaves are about two-thirds grown ; then fol- 

 low with other applications of the same preparation 

 at intervals of about twelve days, until five or six 

 sprayings in all have been made." (Galloway.) 



The fungus of the Apple Powdery Mildew dif- 

 fers materially from the species affecting pear leaves 

 just discussed. 'Tts vegetative system," says Dr Gal- 

 loway, ''instead of growing on the inside of the host is 

 almost wholly external, and obtains its nourishment by 

 means of suckers which it sends into the cells of the 

 leaf or stem as the case may be. It covers the various 

 parts of the plant with a grayish, powdery, meal-like 

 growth — hence the name Powdery Mildew." 



Remedies — ''Spray the seedlings with the ammo- 

 niacal solution or copper carbonate, first when the leaves 

 are about half grown, and thereafter at intervals of 

 twelve days. Following this plan three sprayings will 

 usually be made before budding, and at least two 

 after this operation, making five in all." (Galloway.) 

 Or the Bordeaux mixture may be used. 



The Leaf-blight of the plum and cherry may be 

 prevented by spraying with the Bordeaux mixture. 

 Apply first when the leaves are one-third grown. 

 "Between this date and the time for budding three 

 more applications should be made at as nearly regular 

 intervals as possible. Ten days or two weeks after 

 the buds are inserted make the fifth application, then 

 follow with the sixth two weeks later." The effect of 

 spraying plum stocks is well shown in the picture on 

 page 103, reproduced from t\\e Journal of Mycology. 

 Be sure that there is an excess of lime in the Bordeaux 

 mixture. 



