The heritability of resistance to early blight in diploid potatoes (Solanum tuberosum, subsp.Phureja andStenotomum)
The heritability of resistance to early blight caused byAlternaria solani (Ell. & Martin) Son was estimated for field grown, diploid potatoes at Fletcher, North Carolina in 1981. Fourteen breeding lines, selected from a random mated hybrid population ofSolanum tuberosum, subsp.phureja andstenotomum, were used. Resistance was measured as the slope obtained by regressing the logit of the disease proportion Y, measured as % defoliation, on time. A wide range of resistance was found. Narrow-sense heritability, as determined by offspring-midparent regression, on an individual plant basis, was calculated to be 0.825.
Compendium of potato diseases.
Compendium of potato diseases , Compendium of potato diseases , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی
Scientific Names of Potato-Infesting Aphids
Although the common aphids that infest Solanum tuberosum L. in North America and Europe appear to be the same, different scientific names are used for them on the two continents. This unsatisfactory situation is confusing to both entomologists and virologists and shouId be corrected. This paper presents the preferred scientific names. Only the most important synonyms are discussed.