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of various insects, such as white grubs, termites, woolly aphis,, 

 etc., and also for nematode worm control. The results thus 

 far have shown that Sodium Cyanide may be used in solution 

 at the rate of one (1) oz. in eight (8) gallons of water and 

 at this strength it did not injure the foliage of any one of the 

 numerous plants tested. When soil was saturated with this 

 solution at such a rate that one (1) oz. of the Sodium Cyanide 

 was applied to 10 to 12.5 square feet of area we obtained very 

 satisfactory results in the practically complete control of 

 white grubs, earthworms, termites, sow bugs and nematodes. 

 It appears now that we have found a very fairly effective, 

 economical and practicable method of fighting some of the 

 soil infesting animals which have been very troublesome and 

 almost impossible of control in the past. This is an extremely 

 important field of study and will be continued. Even at pres- 

 ent high prices for chemicals, the cost of treatment will not 

 he over about $70. 00 per acre. Furthermore, the work thus 

 far has shown an extremely gratifying stimulation in the 

 growth of all plants tested on the cyanide treated areas, which 

 indicates that the treatment has a very important fertilizing, 

 as well as a pest controlling value. 



In the fumigation of Satsuma orange trees for the control of 

 scale insects, white fly, etc., we have secured very satisfactory 

 results so far as the control of these pests is concerned, but the 

 cost of tents, chemicals, etc., has been so high under war 

 conditions and the danger of spreading citrus canker is so great 

 in some sections that this treatment is not likely to supersede 

 spraying for some time yet. 



Carbon disulphid fumigation for the destruction of the sweet 

 potato root borer has not given satisfactory results when used 

 in the sweet potato storage banks. It fails to kill all stages of 

 the insect and evidently increases the rotting of the potatoes. 



Other Projects: 



Inspection work, carried on by the U. S. Bureau of Entomo- 

 logy agents in co-operation with this Department and with the 

 Alabama State Board of Horticulture, has failed to reveal the 

 presence of the sweet potato root borer at any other locality in 

 Alabama than around Grand Bay in Mobile County. A deter- 

 mined effort is being made to exterminate this weevil this 



