Bulletin Volume 111-117

Bulletin Volume 111-117

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910 edition. Excerpt: ...McCarthy farm south of the college at Ames served as excellent places for observations on this insect during 1909 and 1910. All of one field, 40 acres, was in timothy in 1909. Half of it was turned under in 1910 and planted to small grain. It was very lightly pastured in the fall of 1909, but evidently not enough to affect the wheat-head army-worms. Five hundred timothy heads were counted in this field July 21, 1909, and 17.2 per cent injured heads were found then. In 1910 there was 37 per cent of injury June 25, and on July 19 this had increased to 49 per cent. The hay was cut July 25, and in August many eggs and young larva of the second generation were found in the field. Between September 6 and 10, six horses and seven cows were turned on the field. The horses kept to the timothy in feeding, but the cows ate largely in the stubble of the small grain. By September 20 the grass was eaten down fairly well, but a few caterpillars were still at work. On October 4 I compared this field with the second field, which had been badly infested both years, but which was not pastured that fall, and I found an amazing contrast between the two. I could find no larva in the pastured field as I walked through it, but in the-other field they were very common on the second growth of timothy. Practically all of the new green heads were more or less eaten by the wheat-head army-worms. This second growth had been kept well eaten down in the pastured field. Later observations showed the same condition; no larva in the one field, and injured timothy heads and plenty of larva in the other. This was the most striking instance of the value of early fall pasturing that was met with in the two years study of this insect. Other observations, made in September, ..show more

Product details

  • Paperback | 190 pages
  • 189 x 246 x 10mm | 349g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236849604
  • 9781236849601