Symptoms 



Small round dirty-white margined spots, or 

 larger grey spots in leaves. Leaf-spot, due to 

 Oercospora Melonis. VentUate houses so as to 

 get " hard " foliage ; spray with Uver of sulphur 

 or Bordeaux mixture (7). 



Fruit. — Dark depressed spots on rind of 

 fruit, later becoming black and cracking, and 

 sometimes with gummy exudation ; fre- 

 quently large. Flesh of fruit below spot 

 golden or tawny. Scab, due to Cladosporium 

 Scabies. 



Circular brown dry spots on rind. Due to 

 Gloeosporium orbiculare. 



A bacterial disease sometimes causes rot of 

 fruit (and of foliage)." The bacteria are easily 

 carried by insects. 



Spraying is rarely effective with these diseases. 

 Clean cultivation, destruction of affected parts, 

 and good ventilation are the best preventives. 



CUBBANT. 



Stem. — Shoots die back and bear bright 

 coral-red fruits of the fungus Nectria cinna- 

 barina upon them. The fimgus enters through 

 dead wood ; prune out all such. 

 Dahlia. 



Stem. — Death of lower part of stem, which 



bears a grey mould, and subsequently develops 



resting bodies of fungus mycelium as large as 



peas or larger, often within the stem. Sclero- 



78 



