MAIXE AGRICULTURAL EXPERIMENT STATION. I913. S7 



axis of the T they could be adjusted so as to direct the spray 

 forward and upward against the underside of one row and in a 

 hke manner backward against the opposite row. 



SPRAYING FOR BEAN ANTHRACNOSE. 



Bean anthracnose, commonly known as rust, is frequently 

 a very serious and destructive disease in Maine. Rather con- 

 tradictory results have been secured in attempting to control 

 it by spraying. Based on the assumption that failures in the 

 past might be due to beginning too late and not spraying thor- 

 oughly enough some experiments were planned. and carried out 

 at Highmoor Farm last season. 



The field was planted with seed from a crop where much 

 injury from anthracnose was recorded the season before, and 

 this seed showed plenty of evidence of anthracnose upon it 

 v/hen planted. The field was divided into 3 equal parts, one- 

 third to be sprayed with bordeaux mixture, another with lime- 

 sulphur diluted the same as for summer spraying of apple 

 trees, while the remainder was left as an unsprayed check. 

 The first application was made soon after the first foHage 

 leaves formed and this was repeated every week or ten days 

 till the pods were all set and some of them had attained con- 

 siderable size. 



Unfortunately weather conditions apparently were not favor- 

 able foir the best development of anthracnose, for less than 5 

 per cent of the pods were affected on the unsprayed check. The 

 disease was almost entirely controlled where the bordeaux mix- 

 ture and lime-sulphur were used, there being less than two- 

 tenths of one per cent of the pods affected on the sprayed ploti. 

 It is important to note however that heavy applications of bor- 

 deaux mixture at the same strength as used for potatoes and 

 equally thorough applications of lime-sulphur diluted as for 

 use on apple trees in foliage produced no detrimental effects 

 whatever on the bean plants, 



COMPARATIVE STUDIES OE THE GENUS EUSARIUM. 



A preliminary account of these studies was given in this re- 

 port for last year, with special emphasis upon the practical 

 significance of the results obtained. That part of the work 



5 



