Bui. 1477, U. S. Dept. of Agriculture 
1 Xx» 
Plate 26 
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Growth, Fruit Spurs, and Bearing Habits of the Imperial 
Epineuse Plum in Relation to Pruning and to Soil and Other 
Conditions 
A.— Fruiting branches of a tree growing in an unirrigated orchard in a region where sum- 
mer temperatures are high. These branches were headed back each year until 
recently. Note the numerous thriftv spurs but lack of shoots and twigs. (Vaca- 
ville, Calif.) 
B. — Some 10-year-old branches which have borne light crops and have been but lightly 
pruned. The tree is growing in a region where summer temperatures are moderate 
and in soil not irrigated. Note the numerous spurs, twigs, and fruiting branches. 
Fewer twigs are found on lightly pruned trees which have borne well. (Healds- 
burg, Calif.) 
C. — An 8-year-old fruiting branch which has been headed back and thinned out each 
winter, only one shoot being allowed to remain. The soil is not irrigated and is in 
an interior valley of California where summer temperatures are high. Note the 
new shoots on the newer wood and the fruiting twigs which are the outgrowth of 
spurs. (Vacaville, Calif.) 
D. — A 16-year-old tree growing in deep irrigated soil in the cool coastal region of California. 
The new shoots have been severely headed back each winter. Note vigorous wood 
growth. There has been a thrifty development of twigs and spurs throughout the 
tree, and the crops have been heavy. (Niles, Calif., June 30, 1923) 
E.— Framework branch of a 16-year-old tree. The 1-year-old shoots have been severely 
headed back each winter. The tree was grown in the cool coastal region of Cali- 
fornia. Note growth and production of twigs and spurs. (Niles, Calif., June 30, 
1923) 
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