Backcrossing
¥C x A13
¥ø
¥F14
x A14
¥ø
¥B14
x A15
¥ø
¥B24
x A16
¥ø
¥B34
¥C x A9
¥ø
¥F13
x A10
¥ø
¥B13
x A11
¥ø
¥B23
x A12
¥ø
¥B33
¥C x A5
¥ø
¥F12
x A6
¥ø
¥B12
x A7
¥ø
¥B22
x A8
¥ø
¥B32
¥C x A1
¥ø
¥F11
x A2
¥ø
¥B11
x A3
¥ø
¥B21
x A4
¥ø
¥B31
¥To avoid inbreeding, we need to use a different American chestnut parent at each
backcross step and have more than one set of parents for
intercrossing.