-7- 



season progresses the injury symptoms appear on the younger leaves. The deficiency 

 symptoms frequently become apparent in late July and early August. By late summer, 

 the shoots on which leaves show Mg deficiency may be defoliated except for a few 

 leaves near their terminals. Mg deficiency increases fruit drop at harvest. 



Figure 3. Magneisum deficiency symptoms on pear leaves. 



Figure 4. Heat stress symptoms on pear foliage. 



