18- 



the 



man- 



an 



Fig. 1. Developing Mcintosh fruit 

 with calyx-end rot. 



In mid-June, 2-81 of the Mcintosh fruit observed in 8 of 

 10 orchards visited by disease management scouts, were developing 

 calyx-end rots CFig« 1) • 

 Delicious, Cortland, and 

 Macoun also had end rots, 

 but at lower rates. Most 

 infected fruits ripened 

 prematurely, or dropped 

 by mid-August. Despite 

 premature drop, disease 

 agement scouts recorded 

 average of 1.001 infected 

 fruit in 10 orchards dur- 

 ing a harvest survey 

 CFRUIT NOTES 48(1) :11) . 



All orchards with 

 calyx-end rotted fruit 

 in mid-June developed a 

 previously undescribed 

 leaf spot. Spots were 

 1-3 cm in diameter, 

 light brown, and vis- 

 ible on both sides of 

 the leaf (Fig. 2) . 

 These lesions were not 

 bound by veins. Some 

 lesions were noticed 

 next to non-pollinated, 

 wilted blossoms, and 

 several lesions had 

 developed following 

 contact with young end 

 rotted- fruit . Numerous 

 other spots contained 

 an antherl in the center 

 of the lesion. Infected 

 leaves seldom had more 

 than one spot per leaf, 

 with lesions typically 

 larger than frog^eye 

 leaf spot (caused by 

 Physalospora obtusa ) or 

 "captan spot". In con- 

 trast to typical frog- 

 eye leaf spot, the 

 Sclerotinia lesions 

 were an even than with- 

 out concentric darkened 

 areas. Most infected 

 leaves turned yellow 



Fig 



Mcintosh leaf with 

 tinia leaf spot. 



Sclero- 



from an apple blossom 



