Results 91 to 100 of about 408 (134)
Some of the next articles are maybe not open access.
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.
openaire +1 more source
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.
openaire +1 more source
Herbicide-Crop Rotation for Witchweed Control
Weeds, 1967Corn, cotton, peanuts, and soybeans in various rotations received six separate herbicidal treatments in a 5-year rotation from 1959 through 1963. Several of the combination treatments were highly effective in controlling witchweed (Striga spp.). Land heavily infested with witchweed required 3 to 4 years of herbicidal treatments before the competition ...
E. L. Robinson, J. E. Dale, W. C. Shaw
openaire +1 more source
Resistance of Sorghum to Witchweed
Nature, 1959STRAINS 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.
openaire +1 more source
Ethylene, 2-Chloroethylphosphonic Acid, and Witchweed Germination
Weed Science, 1970In 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
openaire +1 more source
Alectra vogelii (yellow witchweed).
2021Abstract A. vogelii is an annual parasitic weed of legume crops, particularly cowpea and groundnut, in semi-arid areas of East, West, Central and Southern Africa. It is closely associated with cultivation, is occasionally found associated with weeds of fallows but rarely in natural vegetation. Copious seed production and a long-lived
openaire +1 more source
Saving Sorghum by Foiling the Wicked Witchweed
Science, 1997One 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 ...
openaire +1 more source
Witchweed: a Parasitic Weed of Grain Crops
Outlook on Agriculture, 1990The 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 ...
openaire +1 more source
Ethylene: A Witchweed Seed Germination Stimulant
Weed Science, 1975Ethylene 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 ...
openaire +1 more source
A (formal) total synthesis of (+) - strigol, the witchweed germination factor
Tetrahedron Letters, 1987Abstract A synthetic route to (+)- 1 commencing from (S)-malic acid and 20 is reported. Key steps are the coupling of 20 and 15 to give 21 , an intramolecular Wittig reaction ( 25-→27 ), and an oxidative cyclization ( 28-→1 ).
Ulrich Berlage +3 more
openaire +1 more source
Control of witchweed (Striga asiatica)in sorghum
Tropical Pest Management, 1984Abstract During 1980–81 field experiments were carried out near Hyderabad, India, to evaluate herbicides and other chemicals for the control of witchweed, Striga asiatica (L.) O. Kuntze in sorghum. 2,4‐D applied at 2 kg a.i./ha in 100 //ha water proved to be the best treatment.
G. R. Korwar, G. H. Friesen
openaire +1 more source