. Le malattie dei cereali e colture foraggere negli Stati Uniti nel 1921. Grano Malattie e Pesti Stati Uniti; piante foraggere malattie e pesti negli Stati Uniti. Avena - Blast 221. Fig. ^'6. Le perdite da blast (figure superiore) e alo-batterico (figure inferiore) di avena nel 1921. È stato verificato da tempo caldo ard ha causato una riduzione nella resa di solo il 1%. Vari altri collaboratori un commento sul fatto che la malattia è stata alquanto diffuse a inizio stagione ma che la sua diffusione è stata controllata con l'avvento del caldo, secco meteo. Tranne I-tontana, dove il rendimento è stato segnalato per essere ridotti mediante l/o, il danno è stato appare

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. Diseases of cereal and forage crops in the United States in 1921. Grain Diseases and pests United States; Forage plants Diseases and pests United States. OATS - Blast 221. Fig. ^'6. Losses from blast (upper figures) and halo-blight (lower figures) of oats in 1921. was checked by hot weather ard caused a reduction in yield of only 1%. Various other collaborators comment on the fact that the disease was quite prevalent early in the season but that its spread was checked by the advent of hot, dry weather. Except I-tontana, where the yield was reported to be reduced by l/o, the damage was apparently negligible. Blast (sterility) cause not determined Oat blast was widely distributed through the country, as is shown on the accompanying map, Fig. , on which the occurrence of halo-blight also is recorded. The blast v;as most prevalent and did the greatest damage in Arkansas, Illinois, Kansas, and California. In Kansas as many as 8o% of the heads were affected in one field. In most of the other states besides those already mentioned the disease occurred, but apparently did not do very much damage. Some observations arc made by collaborators on the effect of weather on development of blast. Heald and Dana state that, according to Prank, there is much blast in v/estcrn Washington each year, due to nutritional or climatic causes. Bolley sug^.ests that it is arsociated with intensely hot weather just at the period vhen the flcv/ers are being pollinated in the sheath, and Vaughan states that in 'sTisconsin the occurrence of blast is correlated v/ith the emergence of the head from the boot in rainy v/cathcr. Apparently anything which interferes with pollination or fertilization is likely to cause blast. Anthracnose caused by Colletotrichum cercale Manns The anthracnose of oats was reported only from Jlorth Carolina, Ohio, and Minnesota. The disease did practically no damage in any one of these states.. Please note that these images are extracted from scanned page images that may

Parole chiave associate all'immagine

• bookcentury1900
• bookcollectionbiod
• bookdecade1920
• bookyear1922