Malattie del cotone, canna da zucchero, malattie del cotone, canna da zucchero, alberi da bosco, piante ornamentali e varie piante negli Stati Uniti nel 1919 diseasesofcotton11mart Anno: 1920 278 disegni mappa mostra la percentuale stimata di riduzione nella resa in vari stati causati da appassire in 1919• questi dati insieme con corres- ponding perdite in balle calcolati dalla produzione stimata sono riportati in forma tabellare in malattia vegetale bollettino supplemento 12, HO92O. Fig. 44. Percentuale stimata riduzione nella resa da appassire di cotone, 1919* molto poco appassire è stato sperimentato in North Carolina w

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Diseases of cotton, sugar cane, Diseases of cotton, sugar cane, forest trees, ornamentals and miscellaneous plants in the United States in 1919 diseasesofcotton11mart Year: 1920 278 The accompanying map shows the estimated percentage of reduction in yield in the various states caused by wilt in 1919• These data together with corres- ponding losses in bales computed from estimated production are given in tabular form in Plant Disease Bulletin Supplement 12, I92O. Fig. 44. Estimated percentage reduction in yield from wilt of cotton, 1919* Very little wilt was experienced in North Carolina when wilt resistant varieties, such as Dixie, were used. In South Carolina, Dixie, Dixie Triumph and Dixie Coolc - wilt resistant varieties - gave good results. In Louisiana, in Beauregard Parish, several fields which had been planted to commercial varieties showed about 25 infection, v/hile three wilt resistant varieties (names not given in report) planted on a field which had previously shown 65 showed only 0 in- fection. In Madison, Ouachita and Caddo Parishes the varieties Minden, Selection A, and Hybrid I43 ~ all wilt resistant cottons - showed from none to yja infection in ' checks with other cotton. In Arkansas the Dixie and Express were successfully ! planted in wilt infested fields. Angular leaf spot and boll rot caused by Bacterium malvacearum E.F.S. This disease was quite general and common in all the cotton growing states except Virginia where it was local. It was reported to the Plant Disease Survey from Arizona for the first time. Angular leaf spot was more severe in Alabama in 1919 than during the previ- ous seasons, This was probably due to the excessive rains which prevailed through- out July and August. In Louisiana and Arkansas it v/as severe, due in all probability to late rains. In I919 it was said to be the most important disease of cotton in Oklahoma, Arkansas and Arizona, and second in importance in Tennessee, More loss occurred from the presence of th

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