314 



The Principles of Fruit-growing 



dition.of the plants. We have already seen (page 308) 

 that at Ithaca, New York, fruits were able to endure 

 the temperature at 18°, even when the buds were well 

 swollen. Hammon gives the following figures at which 

 plants are liable to injury from frosts, compiled from 

 information received from horticulturists throughout the 

 entire Pacific coast. Probably some of them are too high. 

 The temperatures are as nearly as possible those in con- 

 tact with the plant itself: 



Plants or fruita 



Almonds 



Apples 



Apricots 



Grapes 



Grapefruit 



Lemons 



Mandarins and tangerines 



Olives 



Oranges (injured at 2° higher if con- 

 tinued four to six hours) 



Peaches 



Pears 



Peas 



Plums 



Prunes 



Strawberries 



Walnuts, English 



In blossom. 



30 

 29 

 31 

 31 

 31 

 31 

 31 

 31 



31 

 30 

 29 

 30 

 31 

 31 

 28 

 31 



In setting 

 fruit. 



30 

 30 

 32 

 30 

 31 

 31 

 31 

 31 



31 

 30 

 29 

 30 

 31 

 31 

 28 

 31 



At other 

 times. 

 Degrees 



28 

 26 

 30 

 28 

 28 

 28 

 28 

 *18-24 



t26-29 

 29 

 28 

 25 

 29 

 29 

 30 

 28 



*18 ripe, 24 green. t26 ripe, 29 green. 



Howard (Circ. No. 35, Mo. Exp. Sta.) gives the follow- 

 ing temperatures injurious to peaches: "Fully dormant 

 peach buds can stand 8° or 9° below zero. When they are 

 appreciably swollen, zero is the danger-point. When the 

 buds are showing pink they can stand 15° above zero. 

 When the buds are almost open, 25° is the danger-pointi 



