32 



greenhouse is to keep down the moisture in the air, and give the 

 plants sufficient light and ventilation, Massey, in the North Car- 

 olina Station^Bulletiu No, 170, states that sprajnng with a weak 

 solution of potassium sulphide, and dusting the pipes with a wash 

 of sulphur and lime, completely prevented mildew. The latter 

 treatment, however, is probably the most effectual. For out-of- 

 door plants the best treatment would consist in spraying with some 

 standard fungicide. 



Eel Worms or Nematodes [Heterodera radicicolo., (Greef ) Mull.). 



Greenhouse tomatoes, like many other plants, are frequently 



troubled with root galls caused b}' eel worms or nematodes (see 



Fig. 1). These worms affect some plants much worse than 



others. The tomato, however, 

 does not show the effect of gall- 

 infested roots as much as the 

 cucumber and muskmelon, the 

 latter plant being especially sus- 

 ceptible to them. The remedy 

 .for eel worms consists in soil 

 desiccation, or either freezing or 

 sterilizing. The latter method of 

 treatment is the most effectual, 

 and where conveniences are at 

 hand for doing this work it is fully 

 as cheap. Whatever treatment 

 is employed care should be taken 

 to treat the manure, as our experi- 

 ments have shown that the manure 

 pile constitutes one of the greatest 



Fig. — 1. Galls on tomato roots caused by sourceS of infection f Or eel WOmiS. 

 eel worms. rni • • /• i ■ j. 



This species of eel worm is not 

 indigenous to our climate, and probably very rarely survives in 

 our soil over winter. It does, however, winter successfully in 

 unfrozen manure heaps. 



Frvit Rots. 

 Under this head are included troubles caused by a number of 

 organisms possessing different characters, such as bacteria and 

 fungi, which 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 when grown out 

 of doors. The results from spraying experiments are not, how- 



