132 MINNESOTA STATE HORTICULTURAL SOCIETY. 



Mandan, N. D., Trial Station in 1916. 



W. A. PETERSON, SUPT. 



December 4, 1916. — From a horticultural standpoint the 

 season of 1916 was a rather favorable one, even though the rain- 

 fall up to date is more than an inch below normal. 



There was no late spring frost, and the first fall frost did 

 not appear until September 15, when the temperature went down 

 to 23 degrees Fahrenheit. This sudden drop did considerable 



A Mandan, N. D., home— the Virginia creeper a success here. 



damage to poplars from cuttings as they were then still growing. 



The winter injury that took place at this station during the 

 winter 1915-16 was thoroughly stated in the 1916 mid-summer 

 report from this station. 



This summer there has been severe injury from poplar 

 beetles, especially to our trees grown from cuttings. This insect 

 infested poplars and willows alike. Some poplars, especially the 

 silverleaf, are practically immune to injury from this insect. 

 During August almost continuous spraying with lead arsenate 

 was done to keep this pest in check. A power sprayer has been 

 purchased, so the work can be done more effectively in good time 



