Five commercial lettuce cultivars representing different genetic types were grown through aluminum-coated paper, through black polyethylene film, and on bare soil. For each variety, the aluminum mulch reduced the numbers of Macrosteles fascifrons (St~l), reduced the incidence of aster yellows, and increased yields when compared to uncovered controls. The head lettuce cultivar 'Minetto' was most susceptible on unmulched plots (74.3%) while the leaf cultivar 'Grand Rapids' was least susceptible (33.8%). The latter also had the greatest infestation of leafhoppers which may indicate either resistance to the aster yellows agent or shorter feeding times by the vector leafhopper. The abundance of aster leafhoppers on the romaine cultivar 'Valmaine', the butter head cultivar 'Buttercrunch', and the bibb cultivar 'Summer Bibb' was much lower than that of the other two and might explain the lower percentage of aster yellows on these types as compared with 'Minetto'.
Zalom, Frank G.
"The Influence of Reflective Mulches and Lettuce Types on the Incidence of Aster Yellows and Abundance of its Vector, Macrosteles Fascifrons (Homoptera: Cicadelidae), in Minnesota,"
The Great Lakes Entomologist: Vol. 14
, Article 4.
Available at: http://scholar.valpo.edu/tgle/vol14/iss3/4