RESPONSE OF DIFFERENT GROWTH FORMS OF POA ANNUA L. (ANNUAL BLUEGRASS) TO HERBICIDES APPLIED BEFORE OR AFTER EMERGENCE

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Abstract
The response of erect/annual and prostrate/perennial strains of Poa annua to herbicides was examined by treating soil with bensulide or chlorthal-dimethyl prior to emergence and by treating immature and mature plants with endothal or linuron. Chlorthal-dimethyl gave better control than bensulide as measured by a greater reduction in the number of seedlings surviving and dry weight of the survivors. Linuron was more effective than endothal in reducing biomass production of both immature and mature plants. Differential response of the erect and prostrate growth forms was not apparent for either bensulide or chlorthal-dimethyl, or for total biomass production of immature and mature plants in response to endothal or linuron. However, a significant growth form by treatment interaction was obtained for the vegetative component of mature plants, with the prostrate plants showing a greater weight reduction than erect individuals relative to the control. The weight of the reproductive component was equally reduced in both growth forms. Percent dry weight allocated to reproductive growth, which was 35 and 15% for the erect and prostrate growth form, respectively, remained relatively constant for both growth forms for all herbicide treatments.

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