190 Pecan-Growing 



gray spot in the center of this dark colored area. ' " As these 

 spots coalesce, the leaf dries up and falls to the ground. 



Control. 



Nursery blight can be controlled by spraying with bor- 

 deaux mixtures of the same strength as recommended 

 for pecan scab. The first application is given in the spring 

 soon after the trees are fully leaved out. The spraying should 

 be repeated every three or four weeks until late summer, or 

 until the trees have attained a normal amount of annual 

 growth. From four to five applications of the bordeaux 

 mixture will give the trees ample protection against the 

 disease. 



PECAN BROWN LEAF-SPOT 



{Cercospora fusca, Eand. Syn. Clasterospoinum diffuswrrif 



H. &W.) 



The brown leaf -spot of pecans is found practically all over 

 the pecan belt. The disease is thought to attack some species 

 of hickories as well. It attacks the leaves of pecans and there 

 seems to be very little difference in resistance of the leading 

 commercial varieties. Brown leaf-spot is not rated with scab 

 as a menace to pecans although it reaches a point of severity 

 when the trees are defoliated. 



Leaf infection occurs from early summer until fall. The 

 disease is characterized by very small irregular dark reddish- 

 brown spots which extend through the tissues of the leaves 

 and have about the same form and color on both sides. As 

 the spots increase in size they lose a part of their irregular 



^ Rand, F. V. Some Diseases of Pecans, Journ. Agr. Research. Vol. 

 1, No. 4, pp. 303-337. 



