MP-313 NOVEMBER 1958 PECAN DISEASES AND INSECTS AND THEIR CONTROL TEXAS AGRICULTURAL EXPERIMENT STATION ... TEXAS AGRICULTURAL EXTENSION SERVICE College Station, Texas Key to Pecan Diseases 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 page 6 Brown Leaf Spot underside Dark brown to black lesions on veins page 6 Vein Spot and stems Tiny white tufts of fungal growth on page 9 Articularia Leaf Mold underside Small olive green velvety spots. By page 7 Leaf Blotch midsummer, black pimple-like dots appear in the spots Leaflets yellowish, mottled, narrowed page 8 Rosette and crinkled with reddish-brown spots, may be perforated Broomy type of twig growth, bunching of page 8 Bunch Disease leaves DISEASES OF THE NUTS Small black sunken or raised spots page 5 Scab which may fuse to cover entire surface of shuck 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 page 10 Cotton Root Rot infected roots, strands of buff-colored fungal growth may be present NONPARASITIC PLANTS ON THE LIMBS AND BARK Whitish-gray mosslike masses on the bark page 9 Lichens Accumulations of grayish strands page 9 Spanish Moss, Ball Moss hanging from limbs and twigs or ball-like growth on limbs and branches Key to Pecan Insects