













~ POLLENATION AND FRUIT SETTING 
Many tree fruits require the pollen of other varieties for fruit 
setting. Most apples, pears, sweet cherries and many plums re- 
quire cross-pollenation. Peaches, apricots, and sour cherries, on 
the other hand, are generally self-fruitful. Varieties and kinds of 
fruit requiring cross-pollenation are dependent first upon having 
suitable pollenating varieties nearby accomplished by planting 
two or more varieties and secondly upon the activity of insects, 
mainly honey-bees. Further information as to suitable varieties of 
fruit necessary to secure adequate pollenation and fruit setting is 
as follows: 
Apples 
Among those varieties of apples that are notorious for their 
self-unfruitfulness and for being poor pollenizers are Baldwin and 
R. I. Greening. Many others including McIntosh, Jonathan, Grimes, 
Norihern Spy, and Wealthy need pollenizers for best results. 
Among the most effective pollenizers are the Kirby Red 
Delicious and Steele Red varieties. Others include the Rome 
Beauty, Yellow Transparent, Yellow Delicious, Winesap and 
Duchess. 
Pears 
All pear varieties are considered commercially self-unfruitful. 
‘Effective pollenizers are the Bosc, Conference, Gorham and Flem- 
ish Beauty varieties. The Bartlett and Seckel varieties are con- 
sidered as being unable to pollenize each other. 
Peaches and Nectarines 
Peaches and nectarine varieties are commonly self-fruitful 
but a very few varieties, such as the Late Crawford, Rochester 
and J. H. Hale peaches are self-unfruitful. Consequently, these 
varieties should be interplanted with other varieties. The Hale- 
haven peach is considered an excellent pollenizer. 
Cherries 
Sour cherries are all self-fruitful. All commercial varieties of 
sweet cherries are self-unfertile. The Bing and Napoleon (Royal 
Ann) varieties are both self-sterile and inter-sterile to each other 
but pollenize other varieties as well. When planting one of these 
varieties it will be necessary to plant one of the following vari- 
eties with it: Black Tartarian, Schmidt or Windsor. Windsor is 
one of the best pollenizers for all varieties except itself. Always 
plant at least two varieties of sweet cherries but do not plant 
Bing and Napoleon together. Sour cherry varieties are not effective 
pollenizers for sweet cherries. 
Plums 
Most plum varieties do not fertilize themselves and it is 
important to plant at least two different varieties to insure 
fruiting. Japanese varieties should be interplanted with Japanese 
varieties and European varieties with other European varieties io 
secure proper cross-pollenation. European varieties are somewhat 
self-fertile but produce better if two or more varieties are planied. 
The two species do not intercross freely. 
Of the Japanese varieties, Abundance and Burbank planted 
together insure proper cross-pollenation. Any of the European 
varieties may be interplanted to obtain the desired results. 
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