Abstract
In a collaborative EU-funded program (GENRES CT95 42), up to 600 Beta accessions are being screened for resis tance to several important diseases ofsugarbeet (Beta vul garis ssp. vulgaris) including beet mild yellowing virus (BMYV), beet yellows virus (BYV), Aphanomyces cochlioides, Pythium ultimum and powdery mildew (Erysiphe betae). Results are promising, with between 0.3 and 16% of accessions exhibiting high levels of resistance. A preliminary analysis ofBMYV,Aphallomyces, and pow dery mildew data indicates some differences in disease resistance among Beta types. Early testing of progeny de rived from plants highly resistant to BMYV and powdery mildew has shown that these traits are heritable.
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