Germplasm: AKER_12169

AKER_12169

PI 658654

https://doi.org/10.15454/84ZHWZ

F1024 was selected from a population formed by crossing F1016 (PI 608437) and 961009H2, a Cercospora leaf spot resistant breeding line. The population was subjected to three cycles of mass selection for resistance to sugarbeet root maggot. Forty-eight half-sib families were evaluated in 2005 and 14 were selected for a second cycle of selection in 2007. Ten of the 14 families were evaluated in 2008 and eight of the ten were selected. Selected plants from these eight families were allowed to interpollinate and an equal amount of seed from each of the eight lines was combined to form F1024.

Roots of F1024 are white, tapered, and un-branched with a relative shallow groove. The roots are larger and longer than those of F1016, its sugarbeet root maggot (Tetanops myopaeformis R der) resistant parent, and F1024 plants are generally larger and more vigorous than those of F1016. The root maggot resistance of F1024 is equal to or slightly better than that of F1016. Very little root maggot feeding is observed on F1024, even at lower depths where maggot damage is often the most prevalent on susceptible genotypes. F1024 has moderate resistance to Cercospora leaf spot (Cercospora beticola), a foliar disease of world-wide importance. Testcrosses with susceptible female lines had approximately one percent less sugar, higher root and recoverable sugar yields, and substantially less root maggot damage than otherwise adapted root maggot susceptible hybrids, when evaluated with no insecticide at sites with root maggot present.

United States of America