August, '21] LATHROP AND BLACK: WESTERN PEACH BORER 333 



Tree Washes 



Dviring the summer of 1920 rather extensive tests were made of white- 

 wash and of Fuller's Earth wash containing various active agents, such 

 as arsenate of lead, nicotine sulphate, naphthalene, etc. In applying 

 all of these washes, the soil was removed from the base of the tree to 

 the depth of about four inches. The trees were allowed to stand thus 

 until next day, when the adhering soil particles were removed by means 

 of a stiff brush. The wash was then applied as a paint by means of a 

 white- wash brush, the trunks being coated to a height of fourteen to 

 sixteen inches. 



The formulas used were as follows: 



Whitewash 



Row Al. Quick lime 8 lbs. Row A4. Quick lime 8 lbs. 



Arsenate of lead (pd.) K lb. Arsenate of lead (pd.) K" lb. 



Salt 2 lbs. Salt 2 lbs. 



Glue X lb. Glue X lb. 



Nicotine Sulfate 40% 2 ozs. Water to make thick paint. 



Water to make thick paint. 



Row A2. Similar to Al with the addition of one pound of copper sulfate. 



Row A3. Quick Hme 8 lbs. Row A5. Quick Ume 8 lbs. 



Salt 2 lbs. Salt 2 lbs. 



Glue X lb. Glue K lb. 



Naphthalene (flake) 12 ozs. Nicotine sulfate 40% 2 ozs. 



Water to make thick paint. Water to make thick paint. 



Table IV - White\v>(sh Treatments, State Hospital Orch.ard 

 Cottage Farm, Salem, 1920 



