THE CONTROL OF COTTON WTLT AND ROOT-KNOT, 



Root-knot causes a kuotliko oiilar<2;onu'nt of the roots, varjano; in 

 size from a ])inliea(l to a lien's egg. The galls on cotton are small, 



Fig. 5.— Roots of cucumber, shov/i;:g en- 

 largements caused l)y the gallworm. 

 Nearly all other common garden plants 

 are similarly attaclced . There are many 

 thousands of the worms in the nodules 

 upon such a root system. (After Kati 

 Marcinowski.) 



Fig. 7.— Roots of the cow-pea, 

 showing enlargements caused 

 by the gallworm. With the 

 exception of one variety (the 

 Ironcowpea) this plant is very 

 susceptible to the gallworm, 

 and the use of susceptible va^ 

 rieties as green-manure crops 

 in peach orchards and in rota- 

 tions just preceding cotton in 

 the South is to be avoided. 

 (AfterJ.C.Neal.) 



^^^asff^' 



Fig. 6.— Roots of lomato, showing enlargements caused by the 

 gallworm . Tomatoes somet imes suffer severely from this disease. 

 (After George F. Atkinson.) 



on okia larger, and on cucumbers and tomatoes frequently of great 

 size, as shown in figures 3, 4, o, and 6. Ordinary cowpeas are 



rrir. 02] 



