954 EXPERIMENT STATION RECORD. 



The black rot of tomatoes is said to have been quite destructive in the 

 vicinity of Ottawa, and the thoi'ough use of Bordeaux mixture is recommended 

 for its control. 



In some districts of Ottawa the onion blight {PcronoHpora sclileidemana) 

 proved serious during the season covered by the report. While the disease may 

 be checked by change in weather conditions, it is advised that the fields be 

 sprayed with Bordeaux mixture from the end of June throughout the growing 

 season. 



Diseases of pepper and beans, H. R. Fulton {Louisiana Bias. Bui. 101, pp. 

 21, pis. 13). — A disease of pepper, to which the name pepper blight is given, is 

 described. The first indication of this disease is seen in the slight drooping 

 of the young leaves, which may recover at night and appear perfectly normal 

 the next morning; but during the second day the wilting is more pronounced, 

 and finally the whole plant is affected and dies. An examination of the roots 

 of the plant in the early stages of the disease shows discolored, sunken areas 

 just below the level of the ground and sometimes on the larger roots. When 

 the disease has attained a later stage and defoliation of the plant has begun, 

 the areas are larger, more sunken, and more discolored, and in the central por- 

 tion the bark has begun disintegration. The attacks usually begin when the 

 plants begin to form pods and continue until the end of the growing season. 

 The cause of this disease is a fungus, the spore-bearing form of which is not 

 known. 



This disease has been known for a considerable time in Louisiana and was 

 first reported from Florida in 1893 (E. S. R., 5, p. 790), as attacking the tomato 

 and a large number of other plants. In Louisiana it has been observed by the 

 author attacking pepper, bush and pole beans, and the Japanese fiber plant 

 ( Edgeworthia papyrifera ) . 



The fungus is apparently a soil organism, and it has been demonstrated that 

 the application of a clear fungicide, such as ammoniacal copper carbonate or eau 

 celeste, to the ground about the base of the plants will protect them from 

 attack. 



Inoculation experiments with the fungus have proved successful in inocu- 

 lating not only pepper but also a number of other economic plants. 



The bean diseases described are anthracnose, bacterial blight or bacteriosis, a 

 blight or wilt caused by a sclerotium-producing fungus, and a pod and stem rot 

 caused by Rhizoctonia. 



The anthracnose, due to Colletotrichum Undemuthianiun, and the bacterial 

 blight, caused by Pseiidomonas phaseoU, may be controlled by practicing seed 

 selection, the removal of affected plants, rotation of crops, and spraying. 



The fungus blight of beans, due to the sclerotium-producing fungus, which 

 also attacks pepper plants, causes the wilting of the leaves, followed by the 

 death of the plants. The means suggested for the control of the blight on pep- 

 per should be adopted for the protection of beans against this fungus. 



The pod and stem rot, due to Rhizoctonia, manifests itself in three ways — the 

 damping off of the seedlings, a dry rot of the stems, and the occurrence of 

 brown sunken areas on the pods. During 1907 the last two forms- of disease 

 were abundant in Louisiana and wei'e given some attention. So far as the 

 author's observations go, the rot of the pods due to Rhizoctonia becomes seri- 

 ous only when the conditions of warmth and moisture are rather extreme. The 

 fungus is a soil organism and should be combated by care in the selection of 

 seed, the destruction of old stalks and leaves, and rotation of crops. 



On the occurrence of Phytophthora infestans and Plasmopara cubensis in 

 Ohio, A D. Selby {Ohio Nat., 7 (1901), No. -i, pp. 79-So).—The author calls 

 attention to the fact that the fungus causing the late blight and rot of potatoes 



