54 



us conclusively that it was possible to keep this insect in check. Mr. 

 Hart used crude petroleum for two or three years, and was satisfied 

 that it injured his fruit buds to some extent. He tried the lime- 

 sulphur wash last spring and obtained most gratifying results. In 

 fact, some trees which were but half sprayed gave most striking tes- 

 timony to the efficacy of the application. The treated portions were 

 practically free from the scale, while the untreated limbs were nearly 

 covered with the pest. 



A series of experiments with summer washes were undertaken, the 

 principal material used being a modification of the lime-sulphur wash. 

 A large series of small experiments were tried, with no very satisfac- 

 tory results, except possibly in the case of oue wash composed of 25 

 pounds of lime, 20 pounds of sulphur, and 4 pounds of resin to 240 

 gallons. This compound was prepared as is described for the winter 

 wash, except that it was boiled but fifteen minutes before diluting to 

 the required amount. It slightly burned the foliage of old apple trees 

 and killed 85 per cent of the scale. It should be stated that this 

 application was made September 4, and it is very probable that the 

 leaves would stand more then than earlier in the season. We hope 

 to continue experiments along these lines another season, and it may 

 be that something of value will result therefrom. There is need of 

 some more effective summer wash for the San Jose scale than the 

 ordinary kerosene emulsion or whale oil soap solution, and while the 

 mechanical petroleum emulsion mentioned above checks the scale in 

 a fairly satisfactory manner, we do not like to indorse its employment 

 to any great extent. 



In discussing the papers concerning the treatment for San Jose scale, 

 Mr. Kirkland quoted a Mr. Brown as authority for the statement 

 that very successful work had been done by using a wash made of 

 lime, sulphur, and caustic soda, and that no boiling was necessary, 

 and asked the opinion of the members concerning this wash. 



Mr. Felt stated that he did not have very much confidence in the 

 efficacy of a wash prepared as directed by Mr. Brown, and that he 

 could not advise its use. He further stated that he did not think the 

 so-called lime-kerosene wash was what it purported to be, and that 

 even under the best conditions only a relatively small proportion of 

 the kerosene combined with the lime. He did not consider this mate- 

 rial suitable for application to fruit trees. 



Mr. Marlatt stated that he had just come from an examination of 

 insect conditions in California, and that the San Jose scale had reached 

 the stage there and the means of its control were so universally appre- 

 ciated that it had ceased to be a matter of much discussion. The lime, 

 sulphur, and salt wash is the remedy almost universally used. Its 

 effectiveness varies somewhat with the condition of the bark of the 



