STUDIES ON OSCINELLA FRIT LINN. TBE CORRELATION BETWEEN STAGE OF GROWTH OF STEM AND SUSCEPTIBILITY TO INFESTATION

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Abstract
SUMMARY: Oat plants, of known stage of growth, were exposed to Frit Fly attack at different growth periods, with the result that the susceptibility of the main stem to attack was found to be most marked during the two‐ and three‐leaf stages of growth. In the four‐leaf stage susceptibility decreased and beyond this stage the shoot seemed to be immune relatively. Plants in the early one‐leaf stage showed a certain degree of immunity, due probably to size non‐attractiveness rather than to specific morphological characters.Considered in conjunction with the constancy of the prevalence periods of the fly, these observations have a certain importance. Thus a practical solution of the Frit Fly problem may be found either by early sowing (as is already well known) or by the selection of a variety which passes rapidly through all stages of growth preceding that described as the “four‐leaved.” The next step in the investigation would appear to be an examination of the different races or varieties of oat, in order to compare their rates of growth up to and including this stage.

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