phyte. There were no other disease symptoms than those due to the 

 iSclerotium. 



Damping-off of seedlings in flats was due to Fusarium sp. Care 

 in watering and in the use of sterile or new soil should obviate this 

 trouble, 



Henricksen (5) reports bacterial wilt {Bacillus solanacearum Sm.) 

 as Yt'iy common. Such cases of wilt as have been found in the present 

 investigation were, however, in all cases easily attributable to Sclero- 

 fiutn and root knot. 



Gandul, Pigeon Pea (Cajanus indicus). 



The gan lul or pigeon pea is subject to a number of fungus dis- 

 -eases which tend to shorten the life of the plants. 



One of the commonest is Cercospora Cajani P. Henn., causing a 

 h'af spot. Tht^ spots are numerous, subcircular to irregular, medium 

 brown in color, margin indistinct, appearance much the same on both 

 sui-faces. Atfected leaves are shed sooner than normal ones. 



Rust (Uromyces Dolicholi Arthur). — The rust, while ciuite com- 

 mon, causes very little damage. It is characterized by small. dpei>- 

 browu. powdery pustules on the lower leaf surfaces. 



A very serious stem canker, apparently due to a fungus not yet 

 determined, has been observed in several localities, but studies have 

 not been carried out. Numerous other fungi aid in the death and 

 rotting of stems of mature plants, notably Megalonecfria pseudo- 

 trichia^ and others of the same group. 



Lettuce (Lactvca sativa). 



Leap Spot (Cercospora lactucae n. sp.) — But one disease was 

 found on lettuce and that of minor importance. This was a leaf spot 

 dut' to an a[»parently new species of Cercospora, which is described 

 below. Till' fungus attacked principally the older and lower leaves 

 and caused slight injury as long as the leaves were gathered regu- 

 larly. At the time of production of the flowering stalk, however, it 

 j-apidly spread to all leaves and. the numerous spots becoming con- 

 fluent, i^ractically the entire leaf surface of the plant was destroyed. 



Cercospora lactucae sp. nov, — Spots amphigenous, drab (Ridge- 

 way, Plate XLVD. subcircular to angular, slightly sunken, with defi- 

 nite margin (not raised), one to eight millimeters in diameter, often 

 <^onfluent especially along margin and tip; conidiopliores amphi- 

 genous, fascicled, few (four to ten to each fascicle), simple, four 



' Determined by Dr. F. J. Seaver, of the New York Botanical Garden. 



105 



