International Cooperative Screening for Resistance of Peanut to Rust and Late Leaf Spot

After preliminary field screening at Tifton, Ga., 23 groundnut germplasm lines were evaluated at Isabella, Puerto Rico against Puccinia arachidis and 22 of them at Patancheru, Andhra Pradesh, India and Guangzhou, Guangdong, China against the rust and Cercosporidium personatum (Mycosphaerella berkeleyi) in 1976-81. At all 3 locations 9 were resistant to P. arachidis; 6 of these (PI1259747, PI350680, PI381622, PI405132, PI215696 and PI341879) were resistant also to M. berkeleyi and could prove useful in breeding for multiple resistance. The last 2 entries are newly reported as resistant to both pathogens.