1.8 



DOWNY MILDEW 



(Phytophthora infestans, DBy.) 



The downy mildew of tomato is rarely seen in ^Massachusetts. 

 It is caused by the same fungus which is responsible for the well- 

 known blight of potatoes. 



In September, 1!)05, this mildew caused consideral)le injury 

 to field grown tomato plants in this State, ^ and occurred during 

 a period of heavy rainfall. Previous to this rainfall there had 

 been a long period of drought. 



The same disease appeared to cause serious trouble in Cali- 

 fornia^ during that season, and was associated in that State with 

 heavy rainfall. 



The customary Bordeaux treatment recommended for pota- 

 toes will undoubtedly prove efifectual for the down}- mildew of 

 tomatoes in case it should become prevalent. 



ANTHRACNOSE 



One or more fungi (Colletotrichum, etc.) are responsible for 

 a fruit rot which has occasionally been observed in this State, 

 but no serious damage to crops has been reported in this localitv. 

 It generally causes sunken blotches on the side of the mature 



• Fig. 5, showing Anthracnose (Colletotriclium) 



on tomato fruit. 



fruit, and in severe cases the whole fruit eventually becomes 

 affected and decay quickly follows. The disease has been de- 

 scribed by dift'erent writers and its appeai'ance has been noted 

 in widely separated localities. 



1. Mass. (Hatcli) Agr. Exp. Sta., Ann. Rept., 1906, p. lit 



2. Cal. Agr. Exp. Sta., Bui. Xo. 175, 1906, p. 9. 



