Reference Report for IND90010632
| Title: | Response of soybean to natural and simulated corn earworm (Lepidoptera: Noctuidae) pod injury. |
| Authors: | Moss, T.P., McPherson, R.M. |
| Source: | J. Econ. Entomol. 1989, 82(6):1767-1772 |
| Abstract: | The response of soybean, Glycine max (L.) Merrill, to natural and simulated Heliothis zea (Boddie) pod injury was examined under field conditions in Virginia and Georgia. Natural population densities of H. zea that peaked at 27.6 larvae/0.915-m row reduced soybean yield by increasing pods with one seed, and reducing pods with three seeds. Damaged soybean plants were able to compensate for heavy defoliation and pod injury by producing new blooms, pods, and foliage and through increased 100-seed weight. Low population densities (3-4.5 larvae/0.915-m row) did not affect soybean yields. In Virginia, soybean yields were reduced when all pods were manually removed at R4 development (pod elongation) from soybeans under drought stress planted early, between mid-May and early June. This yield reduction was due to a reduction in seeds per plant and seeds per pod. Soybeans were able to compensate more efficiently for total pod removal under near normal rainfall conditions by delaying maturity and producing new blooms, pods, and larger seeds. Plants that had some blooms present when depodding occurred were able to produce new blooms and pods in comparable numbers to the control plants. Depodded plants produced new pods filling with seeds within 2 wk. Yield losses in Georgia were higher when all pods were removed at R4 development in soybeans planted in mid-June compared with soybeans planted in early May. |
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