126 GARDEN FOES. 



(2) Slight Iv <]aiiipiiig guiipowdei', rolling it in paper to 

 torni a s(|uih, adding a little dry powder at one end, 

 thrusting the opposite end in the nest, setting it alight, 

 and then digging out tlie nest. (3) Pushing rags saturated 

 with paraffin oil into the nests and setting these alight at 

 night. (4) Hanging wide-mouthed jars partly filled with 

 treacle and water, or stale beer and sugar, near ripe fruit 

 outdoors or bunches of grapes indoors; the wasps will be 

 allured to taste this, and be drowned. 



Other Pests.— Ill ad(htion to the foregoing pests, 

 several others attack the plum, as the Winter, 

 March, and Vapourer Moths, Cherry Sawfly, Pear Lyda, 

 Shot Borer Beetle, Goat and Leopard Moth, Fruit Tree 

 Bark Beetle, and Mu-sisel Scale. These are described in 

 the chapter on "Apple Pests," which see. 



B. -DISEASES. 



Bladder-Pium Disease (Exoa^cus pnuii).— This i« 

 a fungoid disease which attacks the fruit of the plum and 

 damson. The mycelium of the fungus finds its way to 

 the ovary of the flower, and the young fruit, instead of 

 developing in the normal way, forms a bladder-like object, 

 stoneless and hollow within, and with a wrinkled, warty 

 exterior. In due course, the fruit of the fungus appears 

 as a white bloom on the surface. Once a tree bears these 

 abnormal fruits it is likely to continue to do so, since the 

 mycelium permanently resides in the shoots near the 

 point of new growths. 



Remedy. — The application of fungicides is useless. The 

 only thing that can be done is to cut away the shoots 

 which have borne the diseased plums a foot or more back, 

 and to burn them. All diseased fruit should be promptly 

 gathered and burnt. 



Plum Gummosis (Cladiosporium epiphyllura). — 

 Plum, cherry, apricot, and peach trees are sometimes at- 



