Effect of Herbicide 2,4-D on Bean Chocolate-Spot Disease


THE herbicide 2,4-D (2,4 dichlorophenoxyacetic acid) has been recorded to affect fungal-host relationship. Ibrahim1 demonstrated a reduction in the number of rust uredosori to one-fifth on treated oat plants compared with controls. Similarly, Crowdy and Wain2 recorded a suppression in bean chocolate-spot disease treated with 2,4,6 trichlorophenoxyacetic acid. On the other hand, wheat plants treated with 2,4-D were found to be weakened, stunted and predisposed to a heavier infection with Helminthosporium sativum 3. 2,4-D has been recorded to cause a depletion in the carbohydrate content of treated plants4,5; Weller and co-workers6 observed a depletion of non-reducing sugars.

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  1. 1

    Ibrahim, I. A., Phytopath., 41, 951 (1951).

  2. 2

    Crowdy, S. H., and Wain, R. I., Ann. App. Biol., 38, 318 (1951).

  3. 3

    Hsia, Y. T., and Christensen, J. J., Phytopath., 41, 1011 (1951).

  4. 4

    Mitchell, J. V., and Brown, J. W., Bot. Gaz., 107, 120 (1945).

  5. 5

    Wort, D. J., Amer. J. Bot., 36, 673 (1949).

  6. 6

    Weller, L. E., and co-workers, Plant Physiol., 50, 289 (1950).

  7. 7

    Gawadi, A. E., Ph.D. thesis, Cambridge (1935).

  8. 8

    Menon, K. P. V., Ann. Bot., 48, 187 (1934).

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