62 



Yearbook of the Department of Agriculture, 1921. 



Fig. OS. — Citrus fruits can withstand only a few degrees of frost. About three-fiftlis 

 of the acreage is in California and nearly two-fifths in Florida. There are a few orch- 

 ards in the Mississippi Delta in Louisiana, in the Brownsville, Tex., district, and near 

 Phoenix, Ariz., and recentJy hardy Satsuma orange trees have been planted along tlie 

 Gulf coast in eastern Texas, southern Mississippi, and Alabama. Lemons are practically 

 confined to California, grapefruit largely to Florida, while oranges are grown in both 

 States. 



The principal pear districts are the Ontario shore counties and the Hudson Val- 

 ley of New York, southwestern Michigan along the lake, the foothills of central and 

 southern California, western Oregon, and the Yakima Valley of Washington. 



Fig. 69. — Only three kinds of nuts are produced on a commercial scale in the United 

 States — pecans, 'walnuts, and almonds. The pecan is native to the lower Mississippi 

 Valley, and the largest acreage is found in a belt which extends from central Missouri 

 across Oklahoma to south-central Texas. Recently extensive planting of i>ecan trees has 

 taken place on the coastal plain in Georgia, the CaVolinas, Alabama, Mississippi, and north- 

 ern Florida. Almonds and walnuts have been introduced from the Mediterranean region 

 and their production is practically confined to California, except for a considerable acre- 

 age of walnuts in the Willamette Valley of Oregon and adjoining counties in Washington. 



