16 Oklahoma Agricultural Experiment Station 



rather coarse, should be used. An angle at the end of the spray 

 rod for the nozzle to fit on is absolutely essential for effective 

 application, as it is necessary to throw the liquid upward in order 

 to reach the bugs on the under side of the leaves. This should be 

 followed up in two weeks with another application to get the 

 young that have hatched after the first application. The eggs are 

 not affected by any spray that was used as they are so very well 

 protected by the gluey substance secreted by the female at time of 

 deposition. 



Nicotine Sulphate 



Several brands of nicotine sulphate were used, containing 40% 

 active nicotine, at the strength of 1 to 700 and 1 to 600, but with 

 unsatisfactory results. When used, a small quantity of soap is 

 necessary as a spreader and sticker as the nicotine alone collects 

 on the leaves in small drops and does not reach all the insects. 

 Fish oil soap added to the tobacco decoction enhances its value. 



Fink in his control experiments with the eggplant lace-bug 

 (G. solani, Heid) also records unsatisfactory results with nicotine 

 sulphate as a control for the adult forms when used as strong as 

 1 to 600. The writer hesitates in recommending tobacco solution 

 as his results from the use of the same were not uniform or 

 satisfactory. 



Concentrate commercial lime sulphur, 1 to 40, was used but 

 proved unsatisfactory in controlling the adults. Lime sulphur 

 plus nicofume liquid was also tried out with no better results. 

 The proportion used was, concentrate lime sulphur 1 quart, nico- 

 fume liquid l /i pint, water 25 gallons. 



Conclusion. Results from the tests made indicate the fish oil 

 soap solution to be the most practical and effective, and when 

 carefully applied with a good spraying apparatus, it should be as 

 economical as the other solutions tested, if not cheaper. 



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1843 Harris. Letter in The New England Farmer for Tune. 



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1867 Walsh. Practical Entomology, Vol. II, p. 47. 



1868 Walsh and Riley. Leaf-Bugs, The American Entomologist, Vol. I, No. 1. 

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