272 Diseases of Greenhouse Crops 



bulbs. The latter should therefore be discarded and 

 only healthy ones used. 



Grape Hyacinth {Muscari hotryoides) 



Cultural Considerations. As soon as the bulbs are 

 brought in the house, they should be given the bene- 

 fit of the full light, and a low temperature. Neg- 

 lect in this direction will result in spindly weak 

 plants. 



Fungi of the Grape Hyacinth 



This plant is apparently very hardy. There are 

 but two fungi recorded on this host : 



Vromyces scillarum (Grev.) Wint., TJstilago 

 vaillantii Tul. 



Hydrangea (Hydrangea kortemis) 



Cultural Considerations. Hydrangeas are valu- 

 able because of their adaptability to forcing for the 

 Easter trade. Plants should be brought in the early 

 part of January and freed from all old and dead 

 leaves. The beginning temperature should be about 

 45 degrees F. and after two weeks it should be raised 

 ten more degrees. To force them to flower the tem- 

 perature is raised to 65 degrees. Ten days before 

 Easter the blooming plants are given a temperature 

 of 50 to ^^ degrees. This hardens the blossoms and 

 gives them better keeping qualities. During active 

 growth they need plenty of ventilation, sunlight, 

 and water, and frequent syringing. 



