196 Th-e Sugar-Beet in America 



combating the diflBculty. ]\Iany farmers, who have for 

 several years raised sugar-beets on the same land, are 

 being forced by the nematode to practice rotations. 

 Shaw ^ has proposed dividing the sugar-beet states of 

 the country into the following four groups and has given 

 crops to be included in rotations in each group : 



Group (1) California and Arizona. 



Group (2) Oregon and Washington. 



Group (3) Utah, Montana, Nevada, Colorado, Kansas, and 



South Dakota. 

 Group (4) Nebraska, Wisconsin, Indiana, Michigan, Ohio, 



New York, and West Virginia. 



Crops for the groups : 



Group (1) Co^Tjeas, soybeans, sweet clover, rye, the millets, 

 tomatoes, asparagus, lettuce, cantaloupes, straw- 

 berries, barlej-,2 corn,^ Lima beans,^ and wheat. ^ 



Group (2) Cowpeas, soybeans, sweet clover, rj'e, the millets, 

 truck crops (such as lettuce and asparagus — 

 but not celerj-), barley, ^ and wheat. ^ 



Group (3) In addition to the crops mentioned in Group (2), 

 cantaloupes, cucumbers, and potatoes. ^ 



Group (4) Clover, cowpeas, sweet clover, soybeans, rye, the 

 miUets, tobacco, flax, peppermint, cucumbers, 

 strawberries, melons, lettuce, asparagus, some 

 other truck crops, the grasses with the exception 

 of tall oat-grass, barle}-,^ corn,^ Lima beans, 

 potatoes, and wheat.^ 



WTien only small areas are infested, the pest may be 

 prevented from spreading by pulling and destroying with 

 quicklime beets for several feet around the infested area. 

 ^^^len there might be a possibility of carrying the pest 



1 Shaw, H. B., U. S. Dept. of Agr., Farmers' Bui. No. 772. 



2 Occasionally slightly infested with beet nematode, but may 

 be used in a rotation series. 



