AGRICULTURAL RESEARCH IN NEW HAMPSHIRE Zl 



the new compound is added to the spray tank in proportions as Httle as 2 

 pounds in 100 gallons of water. 



In experiments looking toward control of the apple maggot pheno- 

 thiazine was compared with standard lead arsenate spray. Control was 

 neither better nor worse. 



The spruce bud worm was the subject of extensive scouting in the 

 northern part of New Hampshire, through co-operation with the State 

 Forestry Department. It has not yet been found in New Hampshire, 

 though present not far away, in Canada. 



W. C. O'Kane, J. G. CoNKLiN, L. C. Glover, W. J. Morse 



ORNAMENTALS 



The Growth of Gerbera in the Greenhouse 



The plants treated with various fertilizers during the previous winter 

 were placed outdoors all summer. In the fall, they were returned to the 

 greenhouse and divided into three groups of seven plants each, and each 

 plant in one of these groups was given one of the following treatments : 



8-16-16 

 N as NH4 N as NO3 Commercial fertilizer 



5 gm. (NH4)2 SO4 5 gm. NaNOs 20 gm. 



5 gm. Na tetraphosphate 5 gni. Ca superphosphate 

 5 gm. K Ci 5 gm. K Ci 



5 gm. CaCOs 

 5 gm. MgS04 



These treatments were repeated at monthly intervals. The plants all 

 grew vigorously and produced a good yield of blooms. The total numbers 

 of blooms for each treatment from November 1, 1943 to April 7, 1944 were 

 as follows: N as NH4, 144; N as NaNOg, 116; Complete 145. 



From this it appears that no one of these treatments showed any par- 

 ticular advantage over any other. It is note\\orthv, however, that ammo- 

 nium as a source of N is as good or a little better than nitrate. It further 

 demonstrates the value of pot culture for this species. 



For tests of soil pH and growth temperature, the plants were removed 

 from beds and placed each in a large porous pot. There was no significant 

 difference in the number of saleable blooms for different levels of pH. At 

 60° F, night temperature, liming increased the incidence of crown rot. and 

 mites and other pests were much more troublesome than at 50° F. The pro- 

 duction, however, was significantlv greater at the higher temperature. 



S. DUNN..W. D. HOLLEY 



Carnation Variety Trials 



Twenty-nine varieties of carnations were tested during the past sea- 

 son and the number of rooted cuttings and quality of blooms were noted 

 as well as production records. 



Plants were propagated from December through February, and grown 

 in fiats indoors until April 15, then in cold frames until they were benched 

 during the first week of June. The flatted plants received a light applica- 



