Key to Pecan Diseases
Reading edition
DISEASES OF THE LEAVES
Olive spots on underside page 5 Scab
Downy, buff, or greenish-yellow lesions page 7 Downy Spot
Small, reddish-brown to gray spots on underside page 6 Brown Leaf Spot
Dark brown to black lesions on veins and stems page 6 Vein Spot
Tiny white tufts of fungal growth on underside page 9 Articularia Leaf Mold
Small olive green velvety spots. By midsummer, black pimple-like dots appear in the spots page 7 Leaf Blotch
Leaflets yellowish, mottled, narrowed and crinkled with reddish-brown spots, may be perforated page 8 Rosette
Broomy type of twig growth, bunching of leaves page 8 Bunch Disease
DISEASES OF THE NUTS
Small black sunken or raised spots which may fuse to cover entire surface of shuck page 5 Scab
Pink spore masses on shuck surface page 9 Pink Mold
DISEASES OF THE ROOTS
Galls of various sizes on larger roots page 7 Crown Gall
Splitting and deterioration of bark of infected roots, strands of buff-colored fungal growth may be present page 10 Cotton Root Rot
NONPARASITIC PLANTS ON THE LIMBS AND BARK
Whitish-gray mosslike masses on the bark page 9 Lichens
Accumulations of grayish strands hanging from limbs and twigs or ball-like growth on limbs and branches page 9 Spanish Moss, Ball Moss