446 



BOARD OF AGRICULTURE. [Pub. Doc. 



the same conditions are necessary for the prevention of An- 

 thracnose as for the prevention of mildew, namely, absence 

 of extreme moisture conditions in the house. 



Fig. 5. — Timber rot, cucumber. 



Timber Rot. 

 Timber rot is caused by the same fungus that produces 

 lettuce drop. On the cucumber it causes canker-like groAvths 



on the stem, such 

 growths being associ- 

 ated with black pustules 

 about one-sixteenth or 

 one-eio:hth inch in diam- 

 eter (see Fig. 5). It 

 does not cause excessive damage to cucumbers, as a rule, 

 and the fungus can be entirel}^ eliminated by applying the 

 same methods as described under drop of lettuce. 



Eel Worms. 



These are very likely to infect cucumber roots, and if very 

 abundant they greatly injure the crop. Many of our green- 

 house orrowers have been more or less troubled Nvith them 

 for some years. For remedy, see "Tomatoes." Cucumbers 

 are occasionally subject to other fungous diseases. The 

 most im})()rtunt ones, however, have been touched upon. 



Lettuce. 



There are various diseases common to greenhouse lettuce, 

 which have been described in Bulletin No. 09, issued by the 

 Hatch Experiment Station, Amherst, Mass. 



Fig. C. — a typical normal let- 

 tuce bead. 



Fig. 7. — Lettuce plant affected 

 with drop caused by the fungus 

 Sclerotinia JAbertiana. 



