The Botrytis Blight of Tulips 



347 



TABLE 6. 



Results of Inoculation on Various Hosts from Inoculating Plants 

 Nearly and Distantly Related to the Tulip 



Plant 



Lily of the valley 

 Onion (leaves) . . . 

 Onion (bulbs) 

 Onion (stems) . . . 



Lilium sp 



Narcissus (leaves) 

 Narcissus (leaves) 

 Narcissus (stems) 

 Hyacinth (leaves) 

 Crocus (tops) .... 

 Crocus (bulbs) . . . 



Gladiolus 



Peony 



Potato 



Golden seal 



Inoculum 



Mycelium 

 Mycelium 

 Mycelium 

 Mycelium 

 Mycelium 

 Mycelium 

 Conidia. . 

 Mycelium 

 Conidia. . 

 Mycelium 

 Mycelium 

 Mycelium 

 Mycelium 

 Mycelium 

 Mycelium 



Number inoculated 



Injured 



14 

 3 



16 

 2 



6 



11 







3 







7 



5 



10 



19 



21 



6 



Uninjured 



Number infected 



Injured 



Uninjured 



From tabic G, the relation of B. 

 Tulipae to certain plants is evident: 

 it is not able to attack at all the lily 

 of the valley, the lily, the gladiolus, 

 the potato, or the goldenseal, and, 

 probably, not the peony. However, 

 this relation will be made clearer by 

 a discussion of certain observations 

 made during the attempts to cause 

 infection on these plants. 



Inoculation of onion. — .Leaves and 

 stalks of onion plants were inoculated 

 with three different cultures, one of 

 these a typical culture of B. Tulipae. 

 In those plants that were injured at 

 the lime of inoculation, strong infec- 

 tion took place on the leaves but 

 none occurred on the stems. On the 

 uninjured plants there was no infec- 

 tion. To serve as checks, other plants 

 were inoculated at the same time with 



Fig. 41. result of artificial inoculation 

 Lesion on dormant bulb. The bulb 

 was injured at the point of inoculation. 

 Natural size 



