i6o THE CONNECTICUT POMOLOGICAL SOCIETY. 



15, 20 AND 25 PER CENT. WITH RoSIN SOAP ON PeAR TrEES. 



These trees were also badly infested, were sprayed De- 

 cember I and 2, and examined January 26 and ^y. 



Tree sprayed with 15 per cent. K-L with rosin soap had 

 90 per cent, scales dead, 9 i-io per cent, alive or doubtful. 



Tree sprayed with 20 per cent. K-L with rosin soap had 

 55 per cent, scales dead, 45 per cent, alive or doubtful. 



Tree sprayed with 25 per cent. K-L with rosin soap had 

 98 per cent, scales dead, 2 per cent, alive or doubtful. 



■ There is a wide discrepancy between the results of 15 per 

 cent, and 20 per cent, mixtures with no satisfactory explana- 

 tion for it. The results of 15 per cent, and 25 per cent, mix- 

 tures with rosin soap gave somewhat better results than where 

 rosin soap was not used. However, it is too early yet to make 

 comparisons and it must also be remembered that this spray- 

 ing was done when the scale was in the condition which makes 

 it hardest to kill. Of the 2 per cent, alive or doubtful scales 

 where 25 per cent. K-L was used, only one insect was found, 

 which seemed to be really alive. 



20 per cent. K-L WITH Caustic Soda. 

 The 20 per cent. K-L with caustic soda, at the rate of i 

 pound to 12 gallons, was used on a few nursery apple trees 

 with excellent results. The spraying was done November 21. 

 When examined January 9 there 986-10 per cent, of scales 

 dead and i 4-10 per cent, alive or doubtful. This mixture 

 was noticeably caustic when it touched the hands or face. 

 Perhaps i pound of caustic soda in 20 gallons of K-L will be 

 sufficient. 



25 per cent. K-L ^Mixtures. 



Only one more experiment will be mentioned. This is a 

 comparison between 25 per cent. K-L, 25 per cent. K-L with 

 rosin soap, and 25 per cent. K-L with dry slaked magnesian 

 lime. The application was made to badly infested pear trees 

 November 12. In a few hours there came an unusually 

 heavy beating rain and wind storm. The mixtures seemed 

 to loosen the scale coverinsf and the dashino: rain washed 



