- 6 - 



Md. Chemiceil Thinning of Apples and Peaches . To (l) learn 



response of heavy-fruiting major varieties of apples to 

 post-bloom chemical thinning sprays and margins of safety 

 for each variety; (2) study effects of time of application 

 and concentration of chemicals on thinning of apples and 

 peaches by means of post-bloom sprays; (3) develop satis- 

 factory method of chemical thinning of peaches in post- 

 bloom period; and, (k) learn possibilities of reducing 

 biennial bearing of major apple varieties by chemical 

 thinning. 



Hort. L-7^-B 



Md. The Mineral Levels and Interrelationships of Mineral 



Nutrients in Fruit Plantings in Marylandl To learn (1) 

 growth and fruiting response of apple trees to levels of K 

 in reuage above that of obvious deficiency; (2) effects of 

 mulching systems on mineral nutrition of apple and peach 

 trees; and, (3) causal factors of a physiological disorder 

 in apple known as "internal bark necrosis", and to effect 

 controls for the condition. 

 Hort. Q-79-h 



Mass. Effect of Pesticides on Quality of Fruits and Vegetables . 

 To (l) develop effective iBsthods for detecting differences in 

 flavor which may be caused by pesticides applied to fruits 

 and vegetables before harvest; (2) learn if flavor differences 

 are due to pesticides per se, to decomposition products of 

 pesticides, or chauiges in food product itself caused by physio- 

 logical response of plant to the chemical; (3) correlate 

 pesticide or decomposition product residuals with organoleptic 

 analyses; and, (k) learn taste threshold values of pesticides 

 and/or -Uielr decomposition products. 



Food Tech. 71 (HE-15. See Part 7, section d) 



Mass • Influence of ChemlcEtl Treatments on Flowering and Fruit - 

 ing oF~Fruit Trees . Improve the size, color and quality of 

 fruit on heavily bearing fruit varieties by the use of chemi- 

 cal thinning materials. Prevent wide fluctuations in the 

 productivity of fruit trees, especially apple varieties, which 

 have a tendency to bear heavily in one year and be practically 

 barren the following year, by the use of chemical thinning 

 techniques. Reduce the hazard of spring frost damage, which 

 may not only reduce or eliminate the current year's crop but 

 also may tend to make even generally annual bearing apple 

 varieties alternate for severeLL years, thereafter, by delaying 

 the time of blossoming with some chemical or other treatment. 

 Improve the set on fruit varieties, which because of climatic 

 conditions or lack of pollenlzers fall to set full crops, by 

 the use of hormone materials or iiaproved methods of pollen 

 diss eminat ion . 

 Hort. 95 



