crosses were made in the spring of 

 J 948, using Winter Banana pollen. 

 Abundant fruits were set and seed 

 was produced. Where Winter Ba- 

 nana was used as the female and the 

 pollen from the tetraploid Mcintosh 

 was used on Winter Banana, no 

 fruits set. 



Seedlings from this particular 

 cross should give triploid trees which 

 will be two-thirds Mcintosh. Here 

 we shall have an opportunity to ob- 

 serve a population of Mcintosh and 

 Winter Banana, using both diploid 

 and tetraploid Mcintosh as the fe- 

 male parent. The results may be 

 valuable from a plant breeder's point 

 of view and there may be equally 

 interesting observations for geneti- 

 cists. For instance, are these seed- 

 lings actually triploids? Miss Charl- 

 lotte G. Nast, Assistant Professor of 

 Botany, who is now engaged in de- 

 termining this point from root tips 

 that were collected before the trees 

 were set in the field, finds that most 

 of them are triploids. If they are 

 triploids, it is possible we may get a 

 variety which does not require cross 



Seedling apples in breeding project. 



pollination, as in the case with Bald- 

 ivin, which is a triploid. 



PEACHES 



Durham is on the northern border 

 of the area where peaches can be 

 grown. At the University of New 









'/ 



fef 



r 







Crossing peaches. 

 5 



