1916] PARASITIC EHIZOCTONIAS IN AMERICA 



357 



"Coleus I" on Coleus. WQ seeds. The seeds were all killed by the fun- 

 gus as they were germinating. 



"Coleus I" on Coleus. 48 cuttings. By March 18 all the cuttings had 

 rotted off. Infection began as small spots at the surface of the ground or at 

 the callus. Underground lesions of all sizes were produced, from small spots to 

 places where the whole stem was girdled. The leaves of the cuttings were over- 

 run with mycelium, the fungus in many cases rotting them off. 



"Coleus II" on Chrysanthemum. 48 cuttings. The old infected flat in which 

 the coleus cuttings had rotted off was planted to chrysanthemum cuttings March 

 20. By March 27 all of them had rotted off at the surface of the ground. In 

 some a soft, wet rot was produced. 



"Coleus II" on Coleus. 100 seeds. Seeds germinated March 24 and began 

 to damp off slowly. By May 21 only 30 percent of the plants were still healthy. 



"Coleus II" on Coleus. 48 cuttings. All cuttings rotted off as with " Coleus 

 I." The red-colored cuttings rotted off faster and were much more susceptible 

 than those of the green variety. 



"Corn" on Corn. 50 seeds. Seeds germinated March 17. The plants grew 

 to maturity. When pulled up, no signs of infection were noticed. 



"Cotton I" on Cotton. 50 seeds. The fungus caused a rotting of the seeds 

 as they germinated. 



"Cotton III" on Cotton. 50 seeds. Results same as preceding. 



"Dianthus barbatus S.M." on Dianthus barbatus (Sweet William). 100 

 seeds. Seeds germinated March 19 and began to damp off immediately. By May 



22, 50 percent of the seedlings were diseased. 



"Dianthus barbatus N. P." on Dianthus barbatus (Sweet William). 100 

 seeds. Results same as preceding. 



"Dianthus plumarius" on Dianthus plumarius. 100 seeds. Seeds germinated 

 March 14. By May 22, 80 percent of the plants had damped off. 



"Dianthus sequeri" on Dianthus sequeri. 100 seeds. Seeds germinated 

 March 18 and began to damp off immediately. By May 22 only about 25 percent 

 were still healthy. 



"Eggplant I" on Eggplant. 150 seeds. Seeds germinated March 23. By 

 May 8 only 3 to 4 percent of the plants had damped off. 



"Eggplant II" on Eggplant. 150 seeds. Seeds germinated March 23. The 

 fungus caused a rot of the seeds at germination. 



" Lavatera" on Lavatera trimestris. 100 seeds. Seeds germinated March 

 12. By May 22 about 25 percent of the seedlings had damped off (Fig. 14). 

 On the remainder, lesions of various sizes were present, which in some cases girdled 

 the stem just below the surface of the soil and formed a collar, or constriction. 



"Lettuce" on Lettuce. 125 seeds. Seeds germinated March 13. By April 

 1 all the young plants had damped off. 



"Poinsettia" on Euphorbia variegata. 100 seeds. Seeds germinated March 



23. By May 22, 6 percent of the plants had damped off. 



" Salvia" on Salvia splendens. 100 seeds. Seeds germinated March 23. By 

 May 8, 6 percent of the seedlings had damped off. By May 21, 4 of the plants 

 were infected. Lesions extending into the woody tissues were present on the stem. 



"Salvia" on Salvia splendens. 48 cuttings. These cuttings rotted off very 

 rapidly. Wherever the leaves touched the soil, they were rotted also. By April 

 7, 41 cuttings were diseased and 7 were rooted and healthy. 



"Sugar Cane" on Amaranthus salicifolius. 100 seeds. Seeds germinated 

 March 23. On May 21 all the plants were' perfectly healthy. No infection was 

 present. 



"Thistle" on Clover. 100 seeds. Seeds germinated March 13. On May 21 

 all the plants were healthy. 



Additional Inoculations. On April 1 six flats of infected soil used in the 

 inoculation experiments with carnation cuttings were mixed with soil in larger 

 flats and four hills of potatoes were planted in each. The six flats represented the 



