196 The Sugar-Beet in America 
combating the difficulty. Many 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) Cowpeas, soybeans, sweet clover, rye, the millets, 
tomatoes, asparagus, lettuce, cantaloupes, straw- 
berries, barley,? corn,? Lima beans,? and wheat.? 
Group (2) Cowpeas, soybeans, sweet clover, rye, the millets, 
truck crops (such as lettuce and asparagus — 
but not celery), 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 
millets, tobacco, flax, peppermint, cucumbers, 
strawberries, melons, lettuce, asparagus, some 
other truck crops, the grasses with the exception 
of tall oat-grass, barley,? corn,? Lima beans, 
potatoes, and wheat.” 
When 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. 
When there might be a possibility of carrying the pest 
1 Shaw, H. B., U. 8. Dept. of Agr., Farmers’ Bul. No. 772. 
2 Occasionally slightly infested with beet nematode, but may 
be used in a rotation series. 
