to eight septate, 15-50 by 5-7 am., medium In-own. tips paler; co- 

 iiidia clavate to long- elavate, often enrved. hyaline to smoky, six 

 to twelve septate, tips often non-septate, 3.5-5 by 50-100 mu. 



On leaves of Lactuca sativa L. in Porto Rieo^ Rio Piedras, 6244r 

 (type), 5071, 5613. 



Marimbo, Gourd (Lagoiana hncn)itJia). 



A leaf spot {Cercospora cucurhitae E & E) occurred on this host. 

 The spots were numerous, nearly circular, up to eight millimeters 

 in diameter, brown at first, becoming dull white or tan at the center, 

 with a slightly raised, definite margin, and red brown in color, caus- 

 ing the death of the older leaves. 



INIuSKMELON (Cucumis mclo). 



The growing of melons has been as little successful as th.at of 

 cucumbers. Several diseases are in large measure responsible for 

 this condition, although unsuitable varieties and poor cultural prac- 

 tices nuist be blamed in part. 



On the early (December) plantings the downy mildew (Pspiido- 

 peronnspora ruhrnsis) was especially virulent and accounted for the 

 death of the plants. Spraj^ing with Bordeaux mixture (3-3-50) 

 w^as without apparent effect. The symptoms w^ere the same as on 

 cucumbers. 



ANTHRACNOgE {CoUetot rich H m l<ig( tKirlion | Pass. | Ell. & Hals). — 

 Plantings made later in the season were subject to other leaf diseases, 

 and while not so quickly destructive as the mildew they were quite 

 effective in cutting down the yield to practically nothing. The most 

 important of these was the anthracnose which appeared as irregular 

 browai spots or patches on the leaves. These soon coalesced causing 

 the death of the entire leaf. Often the centers of the diseased areas 

 dropped out leaving large ragged holes. Lesions on petioles and 

 stems were also produced. This disease has been reported as serious 

 on tlie fruit and would doubtless have proved so in this case if 

 tlicrc had been fruit present in any amount. 



Occurring sometimes in the anthracnose spots and at other times 

 alone, another fungus was found, PhijlJoslicta ritndlina. Spots 

 caused by this fungus were light brown, nearly circidar. and with 

 the minute black fruiting bodies (pycnidia > dustin-ed a1 the center. 

 Of minor importance. 



("iiLORosis. — One case of clilorosis was found in which an entire 

 plant had taken on a yellow color, poi-tious of llie stem only re- 



106 



