EXPERIMENTS IN ZOOLOGICAL DEPARTMENT. xxxix 



Applied to Woolly Louse on Alder {Eriosoma tessellata, Fitch.) 



The strength used was one to twelve. The liquid was applied with Woodason 

 'bellows atomizer. It exterminated the lice and did no injury to the shrubs. 



Applied to cherry tree Plant Lice {Aphis cerasi, Fahr.) 



The emulsion was applielone to eighteen strong and one to twelve. In 

 neither case were the lice greatly injured. In the latter case the foliage was 

 somewhat blighted. A second application one to eighteen strong made twenty- 

 four hours later destroyed all the lice. Similar experiments were tried upon 

 the pig weed aphis with like results, except that the plants were injured more 

 by the emulsion. 



Kerosene on Squash Bug (Geocoris tristis, Stal.) 



A little kerosene was turned into a vessel containing water. Into this the 

 squash bugs were dropped in September when they clustered upon the squash 

 leaves and were quickly gathered. All died in a few seconds, 



CARBOLIC ACID EMULSION. 



This was prepared the same as the kerosene emulsion. There is a serious 

 objection to carbolic acid. If purchased in the crystalline form, it is expen- 

 sive ; if in the crude state, the strength varies so greatly that the mixture can 

 not be regulated so as to make it safe, without repeated trials. 



Applied to Cabbage Maggot {Anthomyia brassecce, Bouche.) 



The emulsion one to seventy-five strong was applied at intervals of from four 

 to seven days for three weeks. At the close of the experiment, five only out 

 -of twenty-one treated plants were injured by the maggots. In an untreated 

 TOW in the same bed sixteen out of twenty-four of the plants were attacked. 



The plants were uninjured by the emulsion. Mode of application and soil 

 the same as in case of kerosene emulsion against the radish maggot. 



Applied to Radish Maggot {Anthomyia raphani, Harr.) 



A row of radishes was treated the same as with the kerosene emulsion 

 every three days for four weeks. The strength was one to seventy-five, and 

 each plant received about a tea-spoon full of the liquid at a time. Five only 

 of eighteen consecutive plants were found infested at the end of the experiment. 

 Twenty-two out of thirty-two plants in an untreated row were badly injured. 

 All the plants were blistered and injured by the liquid. 



Applied to cherry tree Plant Lice {Aphis]Cerasi, Fabr.) 



An emulsion one to 100 strong was applied the same as in case of the kerosene 

 emulsion. The lice were all killed, and there was no injury to the foliage. 



The emulsion one to eighty strong was used on the pig weed apis. The lice 

 were mostly destroyed, though the plants were considerably damaged by the 

 liquid. 



EFFECT OF CARBOLIC ACID EMULSION ON PLANTS. 



A wool twine string was soaked in the emulsion before it was diluted, and 

 buried an inch in depth close beside a row of radish plants All the plants 



