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Maize is the third main cereal crop after wheat and rice in
Pakistan, and second after wheat in Khyber Pukhtunkhwa. Horse
purslane (Trianthema portulacastrum L) a member of family
Aizoaceae, is a common weed of maize, cotton and vegetables all
over Pakistan (Hashim and Marwat, 2002). Due to indeterminate
habit, vegetative and reproductive growth continues for the entire
life span (Nayyar et al., 2001). Out of 69 weed species T.
portulacastrum was realized as the most aggressive weed of maize
crop (Kumar and Singh, 1983). At a density of 12 plants m-2 of T.
portulacastrum gave lower maize yield of 3.54 t ha-1 than weed-free
plots 3.89 t ha-1 (Ansar et al., 1996), and infestation can lead to
32.3% losses in maize crop (Balyan and Bhan, 1989). Horse purlane
caused 25 million dollars loss to maize production each year in
Pakistan (PhD Thesis of Muhammad Saeed).
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