ILLUSTRATIONS 



PLATES 



Phoma Destructiva, the Cause of a Fruit Rot ov the Tomato 



Page 

 Plate A (colored). Tomato fruit spotted with Phoma desiruciiva: Fig. i. — 



Natural infection on tomato received from Cutler, Fla., March, 1912. 

 Fig. 2, 3, 4, and 5. — Spots produced as the result of needle-prick inocula- 

 tions with Phoma destructiva 20 



Plate B (colored). Potato and tomato leaflets spotted as result of inoculation 

 with Phoma destructiva: Fig. i. — Potato leaflet from sprayed plant. Fig. 

 2 and 3. — Tomato leaflets from sprayed plant 20 



Plate I. Fig. i. — Phoma destructiva: Group of pycnidia, with surrounding 

 mycelium, showing relation of the parasite to the host tissue. P, Pycnidia; 

 M, mycelium; C, cell of host. Fig. 2. — Phoma destructiva: Single hyphae, 

 showing septation and branching. Fig. 3. — Phoma destructiva: A few 

 pycnospores highly magnified. Fig. 4. — Phoma destructiva: Pycnidium 

 and surrounding mycelium. Fig. 5. — Phoma destructiva: Pycnidium as 

 seen in cross section of diseased tissue of tomato fruit. Fig. 6. — Phoma 

 destructiva: Pycnidium from artificial culture. Fig. 7. — Phoma destructiva: 

 Pycnidium and surrounding mycelium 20 



Plate II. Mature and young tomato plants grown in greenhouse, showing 

 infection by Phoma destructiva: Fig. i and 2. — Mature plants. Fig. i. — 

 Control plant. Fig. 2. — Diseased plant, 10 days after spraying with a spore 

 suspension of Phoma desiruciiva. Fig. 3 and 4. — Young plants with foliage 

 Spotted as a result of inoculation with Phoma destructiva 20 



Plate III. Fig. i. — Phoma desiruciiva: Natural infection on tomato fruit 

 received from Cuba. Fig. 2. — Phoma destructiva: One tomato fruit on vine 

 diseased by needle-prick inoculation 20 



Plate IV. Tomato leaves showing spots produced by spraying with a suspen- 

 sion of Phoma destructiva 20 



Plate V. Potato leaves affected with spots produced by spraying with a sus- 

 pension of Phoma destructiva 20 



Plate VI. Phoma destructiva: Artificial cultures. Fig. i. — Test tube cultiires. 

 a, Melilotus stem ; b, string-bean agar; c, potato slant. Fig. 2. — Corn-meal 

 flask culture 20 



Sources op the Early Infections of Apple Bitter-Rot 



Plate VII. Fig. i. — Givens apple having numerous small blister-like infections 

 of bitter-rot. Fig. 2. — Bitter-rot canker from a Jonathan apple tree. 

 Fig. 3. — Part of a branch of a Givens apple tree which had been injured, 

 probably by freezing. Fig. 4.— Apple branch showing blighted area on 

 which acervuli of the bitter-rot fungus were found. Fig. 5. — Mechanically 

 injured branch of a Missouri Pippin apple tree. Fig. 6. — Branch of Mis- 

 sovui Pippin apple tree affected with apple-blotch 64 



Observations on Rhizina Inflata 



Plate VIII. Fig. i. — Mature fruiting structure of Rhizina inflata, showing the 

 tmdulating upper siuface. Fig. 2. — Immature fruiting structiu-e of Rhizina 

 inflata. Fig. 3. — Fruiting structtue of Rhizina inflata, showing the peculiar 

 mycelial strands or fibrils by which the fruiting body is attached to the sub- 

 stratum 96 



VII 



