CACAO POD DISEASE 69 



when they germinate and start the disease the following 

 season. 



PREVENTIVE MEANS. Spray with dilute Bordeaux mix- 

 ture, commencing when the fruit is quite young, and 

 continue at intervals as required. 



Remove all diseased fruit from the trees, as when once 

 attacked it is valueless, and only serves to spread the 

 disease if allowed to remain. 



Do not allow diseased fruit or * shells ' to remain on the 

 ground in the plantation, as the commencement of the 

 disease each season depends on resting-spores present in 

 such material. 



The fungus is known to attack a large number of 

 different plants; and it will be important to ascertain 

 whether it is present on other plants in the neighbourhood 

 of the plantation. Seedlings are often attacked. 



The disease is most abundant in low, damp situations, 

 or where the trees are much shaded. 



Massee, Kew Bulletin, 1899. 



GRAPE MILDEW 



(^Plasmopara viticola, Berl. and De Toni.) 



This destructive fungus is a native of the United States, 

 being parasitic on various kinds of wild vine met with in 

 that country, and also on cultivated vines. It was intro- 

 duced into France about the year 1878, along with 

 American vines that were imported to replace those 

 destroyed by the Phylloxera, also a pest of American 

 origin. 



In France the poles used for supporting vines are 



