Diseases of fruit and nut Diseases of fruit and nut crops in the United States in 1921 diseasesoffruitn20hask Year: 1922 30 APPLE - Black rot Black rot caused by Physalospora cydoniae Arnaud (Sphaeropsis malprum (Berk,) Pk-) Diring tJie year black rot was reported from practically all of the eastern appl, states and also from Oregon and from Idaho where one collection was made. The disease is of rare occurrence and minor importance in the '.7est. Regarding its occurrence in Oregon Barss reports that, 'It is unreported out- side of western Oregon v;herc it is scattered but never important-' /
Diseases of fruit and nut Diseases of fruit and nut crops in the United States in 1921 diseasesoffruitn20hask Year: 1922 30 APPLE - Black rot Black rot caused by Physalospora cydoniae Arnaud (Sphaeropsis malprum (Berk,) Pk-) Diring tJie year black rot was reported from practically all of the eastern appl, states and also from Oregon and from Idaho where one collection was made. The disease is of rare occurrence and minor importance in the '.7est. Regarding its occurrence in Oregon Barss reports that, 'It is unreported out- side of western Oregon v;herc it is scattered but never important-' / For the United States as a v/hole, the losses from black rot during 1921 t,Pig- b) were second only to those for scab. In Maryland and Virginia the disease v/as the most important apple trouble of the year, according to collaborators, and in Indiana C. L- furkholder reported frog-eye worse than he had ever before noted it. Fig, f). Eatimatod percentage of 121 apple crop lost from black rot. Tlit loss iS largoly due to defoliation, resulting in reduced yi,lds, ooth fo> 1321 inr) 1<322. Some loss, however, in a result of rottin. of tlio fruit-
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