334 



PEAR GROWING IN CALIFORNIA. 



Fig. 139. 



Pears which have developed from delayed bloom, which frequently 

 follows severe spring frosts. 



be used to good advantage. Fuel and equipment are very expensive 

 and the pear grower is not justified in going to the expense of equip- 

 ping his orchard with heaters except in cases such as that first men- 

 tioned. * There are a number of different types of heaters, most of 

 which are made for burning oil. One ordinary type is shown in 



Fig. 140. 



Orchard heaters among Bartlett pear trees in "Sierra Nevada 

 Mountain and Foothill Region." 



116 



