RESPONSE OF ANTHOLYZA AETHIOPICA TO FOLIAR SPRAY WITH SOME AMINO ACIDS AND MINERAL NUTRITION WITH SULPHUR

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Hend E.Wahba¹; Safaa M. Mohamed²; G.E. Attoa² and Abeer A. Frahat²

ABSTRACT

          Two field experiments were carried out during 1995/96 and 1996/97 seasons to study the effect of amino acids (tryptophan and aspartic) as foliar spray at 0.0, 25, 50 and 75 ppm and fertilization with sulphur  which was used as soil dressing or foliar spray on Antholyza aethiopica. Commercial sulphur (99.8 % S) was added to the soil at 0.5, 1.0 and 1.5 g / plant, while micron sulphur (70 % S) was sprayed at 1.25, 2.5 and 5.0 g/L. The second part aimed to study the effect of extracts of scale leaves of corms on cotton leaf worm under the laboratory conditions. All used treatments increased the vegetative growth, flowering parameters, yield of corms and percentages of total carbohydrates, nitrogen, phosphorus, potassium in leaves and total coumarins content in scale leaves of corms compared to untreated plants. Sulphur at 1.5 g/plant as soil dressing and aspartic acid at 50 ppm were the superior in increasing the total coumarins content. Tryptophan at 75 ppm  produced the maximum percentage of total carbohydrates. Two extracts (petroleum ether and acetone) of scale leaves of corms gave higher toxic activity against the cotton leaf worm. While petroleum ether extract was better than acetone extract as antifeeding.