MP-313
NOVEMBER 1958
PECAN DISEASES AND INSECTS
AND THEIR CONTROL
TEXAS AGRICULTURAL EXPERIMENT STATION ...
TEXAS AGRICULTURAL EXTENSION SERVICE
College Station, Texas
2
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 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 | ||