Section R. 285.623.215 - Foundation corn; single cross hybridsRule 215.
(1) A single cross hybrid must consist of the first generation of a cross between 2 certified inbred lines.(2) A single cross crossing field must be isolated by a distance of not less than 660 feet from other corn of like color or texture and 1,320 feet from corn of a different color of texture.(3) All of the following field inspection standards must be complied with: (a) Fields must be inspected by the certifying agency not less than 4 times during the pollinating period.(b) Seed parent plants that are capable of producing viable pollen must be detasseled.(c) When 5.0% or more of the seed parent plants in a crossing field have apparently receptive silks, the field is ineligible for certification if shedders comprise more than 0.5% of the seed parent plants on any 1 inspection or exceed an accumulative total of more than 1.0% for any 3 consecutive inspections.(d) A shedder is a seed parent plant that has more than 1 lineal inch of tassel area with anthers shedding pollen.(e) One or more seed parent lines growing in the same isolation and having more than 5.0% apparently receptive silks are ineligible for certification if 1 or more of the seed parent lines have more than 0.5% shedders, unless the plants in the area that have excess receptive silks are destroyed.(f) Roguing for off-type plants must be performed before the time of pollen discharge.(g) A crossing field in which more than 0.1% definitely off-type plants or more than 1.0% doubtful-type plants in the pollen parent have shed pollen must not be certified.(h) At the time of the last inspection, the seed parent in a crossing field must not contain more than 0.1% definitely off-type plants or 1.0% of doubtful-type plants.(4) A seed lot of a single cross hybrid must not have more than 0.1% definitely off-type ears or more than 0.2% ears with off-color kernels as determined by an ear inspection or winter grow out test.Mich. Admin. Code R. 285.623.215
1994 AACS; 2023 MR 6, Eff. 3/28/2023