Location: Fruit and Tree Nut Research
Title: Hickory shuckworm: an almost season-long pest of pecanAuthor
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Submitted to: Pecan South
Publication Type: Trade Journal Publication Acceptance Date: 4/7/2020 Publication Date: 5/1/2020 Citation: Cottrell, T.E. 2020. Hickory shuckworm: an almost season-long pest of pecan. Pecan South. 53(3):12-20. Interpretive Summary: The hickory shuckworm is a serious pest of pecan. Mature larvae of the last fall generation overwinter in pecan shucks on the orchard floor or still hanging in pecan trees. Adult emergence from these shucks is bimodal with an early peak in April followed by a lower but prolonged emergence period from late June into September. First emergence occurs during hickory bloom before pecans bloom limiting hickory shuckworm oviposition to hickory nuts and Phylloxera galls on pecan and hickory. First generation adults that developed in hickory nuts and galls attack pecan nutlets beginning in June. From this point on, pecans are susceptible to oviposition by the four to five generations of hickory shuckworm. Technical Abstract: The hickory shuckworm, Cydia caryana (Fitch) (Lepidoptera: Tortricidae), is a serious pest of pecan. Mature larvae of the last fall generation overwinter in pecan shucks on the orchard floor or still hanging in pecan trees. Adult emergence from these shucks is bimodal with an early peak in April followed by a lower but prolonged emergence period from late June into September. First emergence occurs during hickory bloom before pecans bloom thus restricting C. caryana oviposition to hickory nuts and Phylloxera galls on pecan and hickory. First generation adults that developed in hickory nuts and galls attack pecan nutlets beginning in June. From this point on, pecans are susceptible to oviposition by the four to five generations of C. caryana. |
