April, 1932] Agricultural Research in N. H. 21 



Spray Service 



Codling moths were trapped in one orchard in each of four of the 

 principal apple producing towns by E. J. Rasmussen. Emergence 

 varied in the different localities as indicated by a catch of 1,124 moths 

 in one orchard, 687 in another, 172 in the third, and 12 in the fourth. 

 Counts indicate that side-worm injury is correlated with the number 

 of moths caught, although in the orchards where moths were abundant 

 the growers applied additional cover sprays. 



Apple maggot flies were found to emerge most abundantly from the 

 ground beneath the trees heavily laden with Red Astrachan in 1930. 

 The first flies appeared July 12, the last July 26, with the peak of 

 emergence July 15. There were no traps under trees of Wealthy and 

 Mcintosh which had showed infestation in 1930. 



Drops of Mcintosh infested with railroad worm were placed in cold 

 storage and examined at intervals of 12, 21, and 36 days. No live 

 worms were found after 36 days ' storage at either temperature and but 

 very few after 21 days. The insect thrives in common storage. 

 (State Fund) 



Lettuce in White Mountains 



Despite elements of promise in the Iceberg lettuce experiments at 

 Lancaster we are not yet ready to recommend the crop for large-scale 

 production in the White Mountain area. 



Considerable difficulty with tipburn was experienced during the past 

 season. Observations in the lettuce-growing districts of the west have 

 led to the conclusion that a high night temperature is responsible for 

 tipburn. In 1931 the thermometer ran above 60° on 28 nights. Some 

 tipburn also developed in 1929 when there were 9 nights above 60°. 

 In 1930 with prevailing cool weather no tipburn appeared although 

 there were 12 nights with that temperature. 



The situation is complicated by many factors, which will be dis- 

 cussed in a separate publication shortly. (Purnell Fund) 



Blueberry Investigations 



Field observations by L. P. Latimer indicate that the most successful 

 blueberry farms in New Hampshire are found on hardwood land at 

 elevations from 1,000 to 2,000 feet. Especially favorable conditions 

 are furnished when a fairly shallow and rather acid soil (pH 4.5 to 5.0) 

 with a good underground supply of water overlies granite ledges. 



The fruit is mostly of the low bush type, Vaccinium pennsylvanium, 

 but in deep soil V. corynwosum grows well. With both species there 

 is a variety of types, fruit ranging in size from an elderberry to a 

 hazelnut, varying in shade of color from black to pale blue with and 

 without bloom, in single fruits to large clusters, with insipid to very 

 acid flavor, soft, firm in texture, early, late, and variable in ripening 

 period. Propagation of some of the superior types appears to be a 

 promising field. 



