- 8 - 



to adequate pollination than any other factor. The cool, windy 

 and often rainy weather that frequently occurs during the blue- 

 berry blooming period can seriously curtail bee activity and re- 

 sult in an incomplete set even of the most attractive varieties. 

 Therefore, as an insurance it might be wise to have hives of hon^ 

 eybees available to augment native wild pollinators when periods 

 of favorable pollinating weather do occur. 



Marrucci in New Jersey has recommended 2 active hives of hon^ 

 eybees per acre for the di f f i cul t-to-pol 1 inate varieties - Earli' 

 blue, Coville, Berkeley, Stanley, Pioneer and Concord; one hive 

 per acre for Weymouth, which is moderately attractive; and one 

 hive per two acres for the attractive varieties Rubel , Rancocas, 

 June, Burlington, Blueray and Bluecrop. 



*************** 



LEAF ANALYSIS OF PEAR ORCHARDS IN 1971 

 William J. Lord and Edward Vlach 



Scorch of pear tree foliage (Figure 1) was much less severe 

 this past summer than in 1970 and leaf analyses supported data 



obtained in 1970 which 

 indicated that magnesium 

 deficiency is not the 

 cause of the disorder. 



Fig. 1. Pear leaves showing scorch.. 

 The light colored areas are normal tissue 

 and the picture shows there is no pattern 

 of scorch development . The leaves fre- 

 quently become completely blackened. 

 (Photo by L.J. Musante) 



Potassium (K) 

 of pear leaves rang 

 from 0.58 to 1.39% 

 several orchards sa 

 this past summer, 

 limited data sugges 

 pear and apple tree 

 similar levels of K 

 the desirable range 

 this element in app 

 leaves is 1.25-1.60 

 believe that K is e 

 ly low in some of o 

 orchards . The prim 

 symptom of K defici 

 marginal leaf score 

 pearing first 

 leaves on spur 

 shoots. The m 



level 

 ed 

 in 



mpl ed 

 Since 

 t that 

 s have 



and 



for 

 le 



%, we 

 xtreme- 

 ur pear 

 ary 



ency is 

 h ap- 

 on older 

 s and 

 argi nal 



Extension Pomologist, 

 respecti vely 



and Senior Chemist - W. Experiment Station 



