. 29 - 



Maine Growth Regulators on Fruit Crops . To study effect of 

 various chemicals on fruit set, fruit size, and preharvest 

 drop of apples, blueberries, and other fruit crops. 

 Hort. 38 



Maine Hardy Trunk-Forming Stocks for Apples . To (l) evaluate 

 adaptability of vario\as trunk-forming stocks to the varieties 

 of apples now being produced in Maine; etnd, (2) propagate 

 better stocks for future experimental test plantings. 

 Plant Path., Ent., Hort. 100 Coop. ARS 



Mass. The Nutrition of Apple Trees . To (l) increase knowledge 

 of the effect of different levels of nitrogen on growth, 

 yield, color, and keeping quality of fruit as maintained l>y 

 soil applications of nitrogen fertilizer, mulching materials 

 and complete fertilizers; (2) find out effect of different 

 levels of nitrogen on chemical composition of foliage and in- 

 take of mineral elements into the tree in relation to avail- 

 ability in the soil; (3) determine if application of elements 

 to soil other than nitrogen are necessary to maintain maximum 

 growth and yield; and, (k) determine level of nitrogen which 

 will produce highly colored apples of maximum storage life 

 without losing yield ajid tree vigor, 

 Hort. 96 



Mo, Hormone Sprays for Fruit Thinning and Control of Pre - 



Harvest Drop . To (1) compare NA-Am and IPC at various concen- 

 trations with NA for thinning Jonathan and Golden Delicious 

 apples in 2 or 3 commercial orchards; and, (2) compare 2, k, 

 5-TP at various concentrations with NA for preharvest drop 

 control of Wealthy, Jonathan and Winesap varieties in 2 or 3 

 commercial orchards. 

 Hort. 195 



N. H. The Use of Rootstocks and Interstocks as a Means of 



Securing Smaller, Hardier, and More Productive .^jple Trees . 

 To designate rootstocks or interstocks for selected commercial 

 apple varieties which will modify the trees to meet certain 

 ideals as to size, hardiness, productivity, and early fruiting, 

 Hort. 6k 



N. Max. The Evaluation of Clonal .^ple Rootstocks for the Produc - 

 tion of Dwarf or Semi -Dwarf Trees euid for Resistemce to the 

 Voolly )^hid Insect . To (1) compare and eveiluate growth, pro- 

 duction and other economic oQieiracteristics of trees of commercial 

 apple varieties greeted on certain clonally propagated rootstocks; 

 and, (2) evaluate rootstocks for resistance of Woolly Apple Ajdiid. 

 Hort. 56 



