Hayes and Garber - Cucurbit Breeding

FHl'IT BREEDING 269
which blooms at about the same period. The self-sterile habit
likewise prohibits the reduction of the material to a homozygous
condition. Frequently self-fertile varieties give great increases
in weight of seed and fruits as a result of cross-pollination.
Therefore,
pollinators, varieties which have proved desirable as pollen
parents, are often of considerable commercial value in increasing
yield
in the case of self-fertile varieties.
Table LXXI gives two typical cases taken from the work of
Lewis and Vincent (1909) with the apple.
The large increases in weight of seed as a result of crossing are
TABLE LXXII. CONDENSED STATEMENT OF NUMBER OF SELF-FERTILE,
SELF-STERILE, AND PARTIALLY SELF-FERTILE VARIETIES OF FRUIT CROPS
1
Number