Diseases of cultivated plants and trees

Crown-gall of alfalfa

“…Figures of the galls have been published by various writers (13,22), and all agree with Magnus' original description. The alfalfa plants which furnished the material for these observations were several years old.…”

Powdery scab disease of potato — a review

“…The literature on effects of soil pH on the severity of powdery scab is confusing and contradictory, as illustrated by, for example, the reported effects of adding lime to soil to make it more alkaline. Although the nature of the lime used is often unclear, Berkeley (1846), Brunchorst (1887), Horne (1911b), Pethybridge (1910Pethybridge ( , 1911aPethybridge ( , 1912, Melhus et al (1916) andEl Fahl &Calvert (1976) all claimed that liming increased disease severity, but Massee (1908Massee ( , 1915, Janchen (1921), Philipp (1932), Wenzl et al (1972), Reichard & Wenzl (1976) and Winter & Winiger (1983) associated the application of lime with a reduction in the severity of powdery scab. Sprau (1966) found that adding lime to soil had little effect on powdery scab.…”

Positive Effects of Endophyte Infection on Sycamore Aphids

“…Fries, which causes black lesions (stromata) on the adaxial surface of the leaves of Acer pseudoplatanus L. (sycamore). Some texts describe R. acerinum as a pathogen, for example Massee (1915) states that it causes accelerated leaf fall and reduces tree growth. Other texts consider R. acerinum to have little effect on its host (e.g.…”