Results 131 to 140 of about 1,700 (168)

Witchweed and Soil Fertility

Nature, 1955
JONES1 has recently directed attention to a problem of considerable importance in African agriculture, namely, whether Striga hermontheca Benth. infestation is only serious on ‘worn-out’ soils or whether the ‘wearing-out’ is due to Striga itself.
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Where We Stand with Witchweed

Weeds, 1960
IATITCHWEED (Striga asiatica) was first collected and identified in V Vthe United States during the late summer of 1956. This parasite attacks the roots of plants primarily in the family Gramineae. In the United States it appears to be a potential threat to the corn and grain sorghum crops.
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Ethylene, 2-Chloroethylphosphonic Acid, and Witchweed Germination

Weed Science, 1970
In laboratory studies, ethylene and an ethylene-releasing agent, 2-chloroethylphosphonic acid (hereinafter referred to as CEPA), stimulated germination of aged, pretreated but still dormant witchweed (Striga lutea Lour.) seed. Ethylene gas at 10−1 μl/L produced maximal (89 to 98%) seed germination. Witchweed seed also germinated when incubated directly
G. H. Egley, J. E. Dale
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Striga angolensis (Scrophulariaceae), a New Witchweed from Angola

Brittonia, 1997
Revisionary study in the genus Striga (Scrophulariaceae) has distinguished a new species from Angola in the section Pentapleurae. Restricted to swampy areas, the plant has not been collected for more than fifty years, and its current status is not known.
Kamal I. Mohamed, Lytton J. Musselman
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Dihydroparthenolide and other sesquiterpene lactones stimulate witchweed germination

Phytochemistry, 1989
Abstract Four sesquiterpene lactones which share structural features of the lactone rings of strigol were tested as witchweed germination stimulants. Confertiflorin and parthenin significantly increased witchweed germination at 10 −4 M, and parthenin and desacetylconfertiflorin increased germination at 10 −5 M.
Nikolaus H. Fischer, Jeffrey D. Weidenhamer, Judith M. Bradow   +2 more
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Resistance of Sorghum to Witchweed

Nature, 1959
STRAINS of Sorghum vulgare resistant to root parasite witchweed (Striga lutea) have been bred in South Africa over a number of years.1 One of these (var. ‘Framida’) is characterized by its inability to germinate the parasite seed, which requires a stimulatory substance normally excreted from the host plant roots.
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Ethylene: A Witchweed Seed Germination Stimulant

Weed Science, 1975
Ethylene gas (C2H4) was found to stimulate the germination of witchweed [Striga asiatica(L.) O. Kuntze] seeds. Ethylene diffuses greater than 120 cm horizontally from point of injection and more than 90 cm below the soil surface. Rates of 0.42 kg/ha induced germination of witchweed seeds in sandy soil; but 1.1 kg/ha is required on a heavy clay soil ...
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Saving Sorghum by Foiling the Wicked Witchweed

Science, 1997
One of the greatest sources of crop losses in Africa is not war or corruption but three species of the parasitic plant Striga. Commonly known as witchweed, Striga feeds on the roots of cereals and legumes in much of Africa and South Asia. Estimates of crop losses due to Striga range from 15% to 40% of Africa9s total cereal harvest ...
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How crop-killing witchweed senses its victims

Science, 2015
Pinning down molecules key to finding a host plant paves the way for new controls on the parasite.
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Witchweed: a Parasitic Weed of Grain Crops

Outlook on Agriculture, 1990
The witchweeds, in the genus Striga, are a remarkable group of obligate flowering plant parasites, some of which attack and destroy the crops of small-scale farmers in many parts of the semi-arid tropics. Striga hermonthica devastates sorghum and millet crops grown in Burkina Faso, Cameroon, Chad, Ethiopia, Mali, Niger and Sudan, and the expansion of ...
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