No. i.-} 



FUNGOUS DISKASKS. 



443 



jtJel ]\'onn.s or Nematodes {/fpfertulera radicicoki (Greef) 



Mull.). 



Greoiihouso tomatoes, like iiuuiy other plants, are fre- 

 quently troubled Avith root u^alls caused by eel worms or 

 nematodes (see Fig. 1). These Avorms aflect some plants 

 much Avorse than others. The 

 tomato, however, does not 

 show the eti'eet of i>all-infested 

 roots as much as the cucum- 

 ber and nmskmelon, the latter 

 plant beiiiir es})ecially susce})- 

 tible to them. The remedy 

 for eel worms (H)nsists in soil 

 dessication, or either freez- 

 iii": or sterilizinjr. The latter 

 method of tivatment is the 

 most etlectual, and Avhere con- 

 veniences are at hand for doing 

 this Avork it is fully as cheap. 

 AMiatever treatment is em- 

 l)loyed, care should be taken 

 to treat the manure, as our 

 experiments have shoAvn that 



the manure pile constitutes one of the greatest sources of 

 infection for eel Avorms. This species of eel Avorm is not 

 indigenous to our climate, and })robably very rarely survives 

 in our soil over Avinter ; it does, hoAvever, Avinter successfully 



in unfrozen manure heaps. 



Fruit Bots. 



Under this head are included 

 troubles caused by a number of or- 

 ganisms possessing diU'erent charac- 

 ters, such as bacteria and fungi, 

 Avhich cause a rotting^ of the fruit 

 (see Fig. 2). Fruit rots are common to both greenhouse 

 and outdoor tomatoes, and the general practice has been to 

 spray tomato crops Avhen groAvn out of doors. The results 



¥ui. 1. — Galls on tomato roots rauscd by 

 eel worms. 



Fig. 2. — Tomato rot. 



