Annual report ..[bulletins and circulars] . 84,—Abundance. From Abundance polle7i above, from Grand Duke pollenbelow. Some benefit front cross-pollination. to know how many trees will be necessary to pollinatethe self-sterile variety. There are three things to be consideredhere: the ability of the pollinizer to produce pollen, its marketvalue,and the classof fruit to which the self-sterile variety differ in the amount of pollen which they produce, andthe pollen production of the same variety is also greatly modifiedby differences in locality and season. Other things being equ
Annual report ..[bulletins and circulars] . 84,—Abundance. From Abundance polle7i above, from Grand Duke pollenbelow. Some benefit front cross-pollination. to know how many trees will be necessary to pollinatethe self-sterile variety. There are three things to be consideredhere: the ability of the pollinizer to produce pollen, its marketvalue,and the classof fruit to which the self-sterile variety differ in the amount of pollen which they produce, andthe pollen production of the same variety is also greatly modifiedby differences in locality and season. Other things being equal,the variety which produces pollen freely could be used more spar- 36o Bulletin i8i. ingly in a block of self-sterile trees than one of scanty pollenproduction. lyittle comparative observation has been made onthis point as yet; but as a matter of fact, most of our commonvarieties produce an abundance of pollen. The number of trees of the pollinizer would also depend largely. 85. — Talman Sweet. From Talman Sweet pollen above, fromWagener polleyi below. No benefit front cross-pollination. on whether it has value in itself. If we are planting LeConte topollinate Kieffer, we would naturally try to get along with theleast possible number which will do the work ; but if Bartlettsare to be used for the same purpose, we can afford to increase theprpportion. Some growers plant everj^ tenth row to the polli- Pollination in Orchards. 361 nizer, but the proportion should usually be greater. This mightbe enough if the weather during the blossoming season is veryfavorable for cross-pollination by wind and insects; but if it isshowery, the pollinizers should be more abundant, in order that
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