Effects of 2,4-D and GR 24 on seeds germination of witchweed ( Striga hermonthica (Del.) Benth.)

Awadallah B.Dafaallah, Abdalla M. Hamdoun, Abd Elgabar T. Babiker

Abstract


Five laboratory experiments were conducted during April 2006 in Wad Medani, Sudan to study the effects of 2,4-D at 2.5-100mM during pre-conditioning and]on pre-conditioned witchweed seeds, simultan-eously with, prior to, or after GR 24 at 0.001, 0.01 or 0.1 ppm on germination of  witchweed seeds. The results revealed that application of 2,4-D at the concentrations tested at conditioning or simultaneously with GR 24 on pre-conditioned witchweed seeds significantly suppressed germination. However, it stimulated the germination of pre-conditioned seeds. When 2,4-D or GR 24 were applied 3-24 h prior to the application of the other, germination and abnormal germination of witchweed seeds progressively increased with increased period prior to their application.

 


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