152 



GARDENING FOB THE SOUTH. 



A small quantity of the seeds are placed in a tight box 

 and a portion of the carbon bisulphide is poured over 

 them; another layer of seeds and fresh carbon bisulphide, 

 and this operation is repeated until the box is filled. A 

 close cover is put on and the box allowed to stand for a 

 day or two, when the fumes of the poison will kill all 

 of the insects in the seeds. In the use of this chemical 

 greavt care must be taken because of its inflammable quali- 

 ties. See that no 

 smoking is permitted 

 within the room. 

 where the work is 

 being conducted, or 

 a disastrous explo- 

 sion will result. 



Hetcrodera radi- 

 cicola ( G r e e f f ). 

 Mull; Nematode 

 root-galls. These 

 arc enlargements 

 on the roots of cer- 

 at lacked by a microscopical worm, which 

 the roots. Professor Atkin- 

 son, in his study of this worm in Bulletin \) of the Alabama 

 Experiment Htation, gives the following description of 

 the disease: "The surface of the gall is at first smooth, 

 more or less undulate, or papillate, but becomes later 

 roughened, scurfy, or cracked, and finally decay of the 

 tissues sets in. When the roots begin to die they send 

 out new roots in the efforts of the plant to recover from 

 the effects of the disease. These roots in turn are at- 

 tacked and deformed." 



Inasmuch as the worm is found in the tissues of the 

 roots and the openings they make are so minute it is 

 impossible to reach them with the ordinary methods of 



Fig. 56—J:ntc]u<x quadrimaculatus. a, Beetle. 

 b, Larva, c, Pupa. All enlarged. Chitten- 

 den, Div. Ent. U. S. Dept. Agri. Year Book, 



1898. 



tain plant; 



