622 



FUNDAMENTALS OF FRUIT PRODUCTION 



limits to the production of fruits of particular kinds and mean rather than 

 maximum temperatures during four to six weeks of the warmest weather, 

 that set their southern limits. ^^ There are, however, numerous 

 exceptions. 



Fig. 66. — Computed length of available growing season 4 years in 5. (After R^ 



Peach Growing as Influenced by Temperature. — The varying in- 

 fluences of temperature on the geographic range of fruits are shown 

 clearly by the peach, if comparison be made between Europe and the 

 United States. Table 1 shows mean monthly temperatures at selected 

 points. Bordeaux, Perpignan, Montpelher and Lyons in France may be 

 considered to have temperatures favorable to peach growing. Roscoff, 

 in Brittany, Plymouth, England, and Bergen, Norway, are in regions 

 where few or no peaches are grown, though they are warmer in winter than 

 Rochester, New York, which is typical of much of the peach-growing area 

 in the northeastern states. The difference between the points named 

 where peach growing is successful and those where it is not Hes in the sum- 

 mer temperatures. So far as winter temperature is concerned peaches 

 apparently could be grown in Berufjord, Iceland; deficiency in summer 

 temperatures seems the limiting factor in a considerable part of 

 Europe. 



Between Nashua and Concord, in New Hampshire, about 35 miles 

 apart, runs the northern limit of commercial peach growing in that section. 

 Examination of the table shows only small differences in mean monthly 



