90 DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 



CONCLUSIONS. 



The foregoing tests of lime-sulphur wash against the larvae of the 

 fall webworm show that this preparation has decided value as a 

 stomach poison. It is considered extremely probable that cater- 

 pillars of many species of insects, and perhaps mandibulate insects 

 in general, will be similarly susceptible. As shown by the data given, 

 lime-sulphur, 1^-50, while slower in killing effect than arsenate of 

 lead, 2-50, nevertheless compares favorably with this strength of 

 arsenical. A comparison, however, of leaf-areas eaten by larvae 

 subjected to lime-sulphur and arsenate of lead, respectively, shows 

 that the lime-sulphur, especially at increased strengths, compares 

 quite favorably with the arsenical in reducing feeding by the cater- 

 pillars. 



This action of lime-sulphur as a stomach poison probably accounts 

 for the reported practical control of the codling moth in orchards 

 treated with lime-sulphur alone, and furnishes an additional reason 

 for its employment as a fungicide. 



Experiments in progress by the Bureau of Entomology during the 

 past two years warsant the statement that entirely satisfactory 

 results in controlling the codling moth in orchards may be obtained 

 with lime-sulphur wash combined with reduced strengths of arsenate 

 of lead. 



ADDITIONAL COPIES of this publication 

 ii may be procured from the Superintend- 

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