POLLINATION AND FERTILIZATION 177 



Bartlett and also produce a good crop itself, as a result of 

 fertilization either from Bartlett pollen or from its own pollen. 

 5. In some cases it may be desired to plant mostly one 

 variety and just enough of the pollinizer to insure produc- 

 tion of the desirable fruit. As an illustration, suppose that 

 one wishes to grow Warfield strawberries for market. As the 

 Warfield bears pistillate flowers only, it will be necessary to 

 plant rows of some variety having stamens to fertilize it. 

 Suppose that the Lovett is chosen for this purpose. As the 

 Lovett bears perfect flowers and is self -fertile, it will bear 

 fruit without being cross-pollinated, and will at the same 

 time furnish pollen for the Warfield. Although the Lovett is 

 a good berry, it does not stand shipping so well as the War- 

 field and the grower will prefer the Warfield. On account of 

 desiring as large a proportion of Warfield berries as possible, 

 instead of planting every other row of the Warfield patch 

 with the Lovett, the grower will plant much less, probably 

 every third or fourth row with the Lovett, an arrangement 

 which would furnish an ample number of plants to pollinate 

 the Warfield. The grower will then have a good combination 

 for the purpose intended. 



If trees do not bear well and the reason is not apparent, the 

 orchardist should study them as to quantity and viability 

 of pollen, self-sterility (or inter-sterility and relative bloom- 

 ing dates if he has more than one variety) and, in general, 

 as to the availability of suitable pollen for fertilizing the 

 blossoms. Owing to variations in the behavior of varieties 

 in different sections of the country, the grower should obtain 

 information from the nearest experiment station as to the 

 desirable combinations tp plant, insofar as such information 

 can be given. 



EXERCISES 



EXERCISE I. Study of flower structure. 



Materials. Blossoms of fruit-trees; sharp knife or scalpel; mag- 

 nifying glass. 



