ENTOMOLOGY. 



165 



Wv^re tried upon 25 plats of potatoes with various arsenical poisons in 

 aqueous solution, for the purpose of determining the effectiveness of 

 these insecticides in killing- the potato beetle, and also their effect upon 

 the foliage of the potato. The results of these tests may be tabulated 

 as follows: 



Effect of insecticides on potato beetle and foliage. 



Experiments were tried in spraying fruit trees with pure kerosene 

 and with the kerosene-water mixture. The results which were obtained 

 indicate that "pure kerosene can be used on all our fruit trees in the 

 dormant season and with proper precaution during the growing season 

 also, except on peach. Water mixtures have with us proved as dan- 

 gerous as pure kerosene. This substance should be used on trees only 

 in cases of necessity." 



The pea louse {Nectarophora destTiictor) is reported as having caused 

 considerable damage in various parts of the State. A number of 

 experiments were conducted with different insecticides in combating 

 this insect. The insecticides which were used were Good's No. 6 

 tobacco-potash soap and a kerosene-water mixture. From these exper- 

 iments it was found that soap solutions in the proportion of 1 lb. to 6 

 or 8 gal. of water, although very effective in killing the lice, caused 

 injury to the foliage. Soap solutions at the rate of 1 lb. to 10 or 12 

 gal. of water were not so destructive to the lice but caused no injury 

 to the plants. In their experiments the authors found that consider- 

 able damage was done to the foliage by the kerosene- water mixture, 

 and this substance is, therefore, not recommended for spraying peas. 



