. Bulletin of the Department of Agriculture. Agriculture; Agriculture -- United States. BULLETIN OF THE No. 160 Contribution from the Bureau of Entomology, L. O. Howard, Chief January 22, (PROFESSIONAL PAPER.) CACTUS SOLUTION AS AN ADHESIVE IN ARSENICAL SPRAYS FOR By M. M. High, Entomological Assistant, Truck Crop and Stored Product Insect Investigations. INTRODUCTION. In the application of arsenical sprays against insects with biting mouth parts the object in view is, of course, to protect the plant or plants from insect ravages by poisoning the foliage, so that the inse
. Bulletin of the Department of Agriculture. Agriculture; Agriculture -- United States. BULLETIN OF THE No. 160 Contribution from the Bureau of Entomology, L. O. Howard, Chief January 22, (PROFESSIONAL PAPER.) CACTUS SOLUTION AS AN ADHESIVE IN ARSENICAL SPRAYS FOR By M. M. High, Entomological Assistant, Truck Crop and Stored Product Insect Investigations. INTRODUCTION. In the application of arsenical sprays against insects with biting mouth parts the object in view is, of course, to protect the plant or plants from insect ravages by poisoning the foliage, so that the insects will, in feeding, take into their system enough of the poison to pro- duce death. Some arsenicals, because they possess a higher percentage of free arsenic, act more quickly in this direction than others, but these are, as a rule, injurious to most plant foliage, unless mixed with some agent that will counteract the free arsenic and produce a more uniform distribution on the plants sprayed. Arsenicals containing a high percentage of arsenious oxid generally possess only slight ad- hesive powers and after a heavy dew or light rain are washed from the foliage. Certain crops demand very prompt protection from the ravages of biting insects; otherwise severe losses are almost certain to be incurred, and to insure the preservation of the crop concerned it is highly important that a poison with some lasting qualities, as well as one quick in action, be applied. Thus it follows that an arsenical must adhere to the foliage if the most favorable results are to be realized. In 1913 and 1914 some experiments were conducted for the purpose of discovering a good adhesive which could be obtained easily and at little expense to the grower. This adhesive has been found in a cactus that flourishes in the Southwest. The variety which was most extensively used in the following experiments, and 1 This bulletin describes the use of cactus solution as ah adhesive in the application of arsenical s
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