Diseases of forest and shade Diseases of forest and shade trees, ornamental and miscellaneous plants in the United States in 1921 diseasesofforest23mart Year: 1922 477 Varietal v/re noted, 'bt-ing vwry corrrion cn the Jack Rose in Indiana, in Oregon varietal differences in susceptibility were strongly apparent. Found both on field and greenhouse plants in I Pig. 9- Geographical distribution of Pov/a-ry :.'dldev; of the rose caused by Sphaerotheca spp. in tlie li • S. as reported to tjie Plant Diseasi Survey. Indiana. Gardner; of Indiana, reports tbixt C- L. Eurkholder held th
Diseases of forest and shade Diseases of forest and shade trees, ornamental and miscellaneous plants in the United States in 1921 diseasesofforest23mart Year: 1922 477 Varietal v/re noted, 'bt-ing vwry corrrion cn the Jack Rose in Indiana, in Oregon varietal differences in susceptibility were strongly apparent. Found both on field and greenhouse plants in I Pig. 9- Geographical distribution of Pov/a-ry :.'dldev; of the rose caused by Sphaerotheca spp. in tlie li • S. as reported to tjie Plant Diseasi Survey. Indiana. Gardner; of Indiana, reports tbixt C- L. Eurkholder held the disease in check with Bordeaux mixture 2-4-5O (Fyrox) until August 1, at which tiirje spraying v/as discontinued. In Michigan 'Grape Bust' a sulphur-tobacco mixture v;as used but without effect. Dates of earliest appearance: May 17, Oregon June 28, Connecticut June 27; Ohio August 20, Delaware. Rust caused by phragmidiun rosae-californicae Diet. V.'ashington, Oregon. (JSB) Rust caused by Phraynidium spp. Illinois - Eowev/hat general in distribution in state. V.'ashington - comriion throughout state. Oregon - western counties. California - throughout state Varietal susceptibility was noticed in Indiana where the disease was serious on wild rose (Rosa £etigera)'-vhich is comnionly grown in lav/ns throughout state. In California it vsras severe on Certain varieties (l'adac] Abel Chatenay, /cnerican Beauty, Paul Ileyron, G'_neral K'cArthur, Killarney, Karie Henrietta, and Eainsborough Pink. In Oregon no varietal susceptibility was noticed, does net appear to be increasing greatly there.
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