46 EXPERIMENT STATION BULLETIN 351 



feet, and Sinox plus ammonium sulfate as an activator in concentrations of 

 1 Vi ounces of each in a gallon of water. Another treatment with one 

 ounce of each in a gallon of water was applied. Controls are present in all 

 cases. 



Inasmuch as the first treatments were started in early May of the 

 present year, it is too early to draw any definite conclusions. However, 

 it is apparent that, in those plots treated at the start of the buttercup 

 flowering (about June 1), concentrations of V^ to !4 pound of ammo- 

 nium sulfamate per gallon of water distributed evenly over 100 square 

 feet of infested pasture made a thorough kill of the buttercup. Pre- 

 sumably, however, these concentrations cause considerable destruction to 

 the prevailing pasture grasses and clover, particularly the latter. Further 

 experimentation is necessary to indicate the most effective amount of ma- 

 terial to use and the most desirable time to apply it. 



A. R. HoDGON, F. S. Prince 



PLANT BREEDING 



Strawberry Improvement 



From more than 4000 crosses made in the greenhouse a year ago, ap- 

 proximately 200 strawberry selections have been made. The plants se- 

 lected bore fruits possessing one or more of the following characteristics: 

 firmness, solid red color, good flavor, good size, and late maturity. Path- 

 finder has apparently been an excellent parent, as selections of this par- 

 entage predominate. Of the individual crosses Catskill crossed with 

 Pathfinder gave the greatest number of promising seedlings. As an indi- 

 vidual parent Catskill gave the greatest number of seedHngs. Pathfinder 

 and others also rank high in this respect. Green Mountain was the least 

 promising parent. Claribel was promising only in that some seedlings of 

 this variety produced late maturing fruit. Tupper gave seedlings that 

 were very vigorous and late maturing fruit. 



L. P. Latimer 

 Tomato Breeding 



Three new introductions have been developed and are being grown 

 to a considerable extent in this state. These include Orange King, a tan- 

 gerine fiesh, determinate variety, medium in earliness; New Hampshire 

 Victor, a variety of similar parentage to the regular Victor, but one 

 which seems to be somewhat more resistant to leaf diseases; and Early 

 Chatham, an extremely earl\% red, determinate variety, particularlv useful 

 where most varieties do not mature. Attention is being given to new 

 crosses between ordinary varieties and Lycopersicon Hirsiinnn, which 

 shows some resistance to late blight. New crosses have also been made 

 between Orange King, a high vitamin variety, and another extremely high 

 vitamin C content tomato. Some crosses between ordinary varieties and 

 Plant Industry #126923 are giving progeny which is extremely early and 

 indeterminate. Whether it will be possible to get a tomato of commer- 

 cial size on indeterminate vines which will be extremely early remains to 

 be seen. * 



A. F. Ye ACER, R, Barratt 



