OREGONWALNUTS 33 



Young walnut orchard with strawberries between rows 



Where the attack appears later in the season it will cause por- 

 tions of the hull to dry, blacken and shrivel, and may cause some 

 premature dropping of the nuts near the harvesting period, and 

 even though it may not destroy the meats, it often makes the 

 nuts unsalable, as it tends to discolor the shells. The disease 

 varies according to climatic conditions, being much worse some 

 seasons than others. The early blooming varieties are gener- 

 ally more attacked than the later blooming ones. This is espe- 

 cially true under California conditions. 



There is no known remedy other than cutting out and de- 

 stroying the affected parts. A recent survey which the author 

 made revealed the fact that it seemed to be a general rule this 

 past year that the young walnut trees which were rather low in 

 vitality were the ones most seriously affected by this disease. 



While the disease certain years has been quite bad on some 

 trees, nevertheless it is not of such a nature as to keep one from 

 entering the walnut industry. The best line of resistance to the 

 disease is in choosing fairly resistant strains, and giving the 

 trees good care. 



The mushroom root rot, which attacks such fruits as apples 

 and pears, also attacks English walnuts. While it does not 

 seem to attack the American Black and California Black roots 



