. Krankheiten aus Baumwolle, Zuckerrohr, Wald, Bäume, Zierpflanzen und verschiedene Pflanzen in den Vereinigten Staaten im Jahre 1919. Fibre Pflanzen Krankheiten und Schädlinge United States; Zucker Pflanzen Krankheiten und Schädlinge United States; Bäume Krankheiten und Schädlinge United States; Pflanzen, Zierpflanzen Krankheiten und Schädlinge in den Vereinigten Staaten. 278 Die beigefügte Karte zeigt den geschätzten Prozentsatz der Verringerung der Ertrag in den verschiedenen Mitgliedstaaten durch willst 1919 • Diese Daten verursacht wurden, zusammen mit entsprechenden Verlusten in Ballen von der geschätzten Erzeugung berechnet werden in Tabellenform in Pflanzenkrankheiten Bulletin Supplement 12, ich 92 O. gegeben. Abb. 44.

• Bildanbieter: Paul Fearn
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. Diseases of cotton, sugar cane, forest trees, ornamentals and miscellaneous plants in the United States in 1919. Fiber plants Diseases and pests United States; Sugar crops Diseases and pests United States; Trees Diseases and pests United States; Plants, Ornamental Diseases and pests United States. 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

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