108 BULLETIN 1366, U. S. DEPARTMENT OF AGRICULTURE 



ZEA. 



Z. mays, maize, Indian corn. 



Aplanobacter stewartii (EFS.) McC. {Phytomonas stewarti (EFS.) Com. S. A. 



B.), bacterial wilt. General east of Great Plains; Southwest; especially 



on certain varieties of sweet corn. 

 Aspergillus sp., ear-mold. La., Tex., Calif. 



Bacterium dissolvens H. R. Rosen, bacterial root-rot. Miss., La., Ark., HI. 

 Basisporium gallarum M. Molliard (Coniosporium gecevi Bub.), cob-rot. 



Conn., Ohio, Iowa, Kans. 

 Cephalosporium acremonium Cda., black bundle. East of Great Plains, 



Calif. 

 Cercospora sorghi Ell. and Ev., leaf-spot. S. C, Ala., La. 

 Colletotrichum graminicolum (Ces.) Wils., anthracnose. Conn., N. J.. 



S. C, W. Va. 

 Diplodia zeae Lev., dry-rot. General where corn is grown. 

 Fusarium culmorum leteius Sherb., seedling blight. Oreg. 

 F. moniliforme Sheld., ear-rot and seed-rot. General. 

 Gibberella saubinetii (Mont.) Sacc, root-rot. General east of Great Plains. 

 Helminthosporium sp., stalk canker. Ga. 

 H. turcicum Pass., leaf -blight. General east of Great Plains. 

 Heterodera radicicola (Greef) Muell., root-knot. S. C, Ala. 

 Ophiobolus heterostrophus Drechs., leaf-spot. Fla. 

 Phyllosticta sp., leaf -spot. Fla. 

 Physoderma zeae-maydis Shaw, brown-spot. N. J., Md. to Nebr. and 



south. Most important in South. 

 Phytophthora cactorum (Leb. and Cohn) Schroet., root-rot. Conn. 

 Puccinia sorghi Schw., rust. General, especially east of Rocky Mts. 

 Pythium sp., root-rot. Fla. 

 Rhizoctonia sp., root-rot. Ohio, Minn., Wash. 

 Rhizopus nigricans Ehr., seed-blight. 



Sclerospora graminicola (Sacc.) Schroet., downy mildew. Iowa. 

 Sclerotium rolfsii Sacc, stem-rot. Fla., Ala., Tex. 

 Sorosporium reilianum (Kuehn) McAlp., head-smut. N. Y., Ohio, Kans., 



Idaho, Wash., Calif. 

 Ustilago zeae (Beckm.) Ung., smut. General. 

 Mosaic, undet. Ga., Ark., La. 

 Sheath-spot, Fusaria and other fungi. General. 



ZINNIA. 



Z. elegans, zinnia. 



Cercospora atricincta Heald and Wolf, leaf-spot. Fla., Tex. 



C. zinniae Ell. and Mart., leaf-spot. Fla., Ala. 



Choanephora sp., blossom blight. Fla. 



Erysiphe cichoracearum DC, powdery mildew. Conn., W. Va., 111., Tex. 



Fusarium sp., wilt. Wash. 



Paratylenchus nanus Cobb, nematode. Md. 



