32 



Bulletin 332 



Orchard Experiments 



During the past two seasons the author has made detailed 

 records on results obtained in various orchards throughout the 

 state, and we are indebted to various owners and managers of 

 orchards for cooperation in this work. In 1917 careful observa- 

 tions were made at Mr. John 11. Barclay's orchard. Mr. Barclay 

 delayed the spraying wdth dormant lime-sulfur 1-9 until the buds 

 started to swell, in order that the spray might be applied near the 



TABLE 6 



Effect of Dormant Lime-Sulfur ]-9 on Eggs of \. Avenae 

 During the Hatching Period, at John 

 H. Barclay 's Orchard 



(1917) 



hatching period of A. sorbi. Dr. Ileadlee's observations show that 

 during 1916 the rosy aphis started to hatch on April 15 in this 

 orchard. Dormant lime-sulfur 1-9 was sprayed on the trees west 

 of the house on March 31, 1917, and on the block east of the house 

 on April 2, 1917. • To our surprise, it was discovered that the eggs 

 were actively hatching at this time, but the nymphs proved to be 

 A. avence. The out-of-door experiments at the laboratory showed 

 some hatch on March 30 and over 20 per cent had hatched by 

 April 2. Mr. Barclay continued to put on the lime-sulfur after 



