447 



Haseman (L.). Cotton Worm.— J/. Econ. Enlom., Concord, vii, no. 2, 

 April 1915, pp. 192-193. 



For the past three years the cotton worm {Alabama argillacea) has 

 migrated northward across Missouri and during the autumn of 1914 

 caused serious injury to late varieties of peaches. The moth is able 

 to break through the skin of peaches, apples, etc., in order to feed 

 on the soft inner tissue. Feeding takes place at sundown. During 

 their migration northward, the moths oviposited on cotton ; the larvae 

 produced, attacked the cotton foliage, causing severe injury, especially 

 at Columbia. In this latitude winter conditions destroy the pest 

 completely. During the summer two parasites, an Ichneumonid 

 ovipositing in the pupa and a Tachinid fly parasitic in the larva, 

 assist in its control. The boll worm {Chloridea obsoleta) was also found 

 to attack the cotton worm in a few cases. 



Scott (W. M.). Arsenate of Lime or Calcium Arsenate.— J^. Econ. 

 Entom., Concord, vii, no. 2, April 1915, pp. 194-199. 

 During the past two years the author has conducted a series of 

 •experiments to determine the value of arsenate of lime as a substitute 

 for lead arsenate. In the experiments recorded, tricalciura arsenate 

 paste was prepared to contain the same percentage of arsenic oxide 

 as is found in standard arsenate of lead, i.e., from 15-16 per cent. The 

 degree of dilution for both materials was 2 lb. to 50 U.S . gals, water, which 

 thus gave the same arsenic content in both diluted sprays. In 1913- 

 1914, apple trees were sprayed with arsenate of lime and lead arsenate. 

 Xime-sulphur was used with both arsenicals to act as a fungicide. 

 Fruit from the sprayed trees was reasonably free from codling moth 

 and no difference could be noted in the efficiency of the two poisons. 

 Calcium arsenate was tested also in New England for the control of 

 shade-tree insects. The results showed that its value was quite equal 

 to that of lead arsenate and there was no injury to the foliage. It has 

 the further advantage of being much cheaper than the lead compound. 

 In the discussion following the paper, Mr. E. H. Siegler stated that 

 during 1914 he had tested a commercial arsenate of calcium containing 

 18 per cent, of arsenic oxide. This was used at the rate of 2 lb. to 

 50 gals, lime-sulphur solution ; three applications were made. The 

 .sprayed trees gave over 98 per cent, of fiuit free from codling moth, 

 while the foliage of those sprayed with calcium arsenate was in better 

 condition than those sprayed with lead arsenate. The compound, 

 containing 20 per cent, arsenic oxide, has been prepared at a cost of 

 lit?, per pound. Care must be taken in the preparation to remove 

 all sodium hydroxide, which is formed as a bye-product. In Mr. Scott's 

 experiments, soluble arsenic up to one-half per cent, was present. This 

 was uniformly lower than the amount in lead arsenate. 



Safro (V. I.). The Nicotine Sulphate— Bordeaux Combination.— J/. 

 Econ. Entom., Concord, vii. no. 2, April 1915, pp. 199-203. 



A series of investigations show that it is possible to combine nicotine 

 sulphate with Bordeaux mixture in spraying. The 4-4-50 formula 

 was used in making up the Bordeaux mixture ; a commercial prepara • 

 tion of nicotine sulphate, containing 40 per cent, nicotine, was used 



