Alectra vogelii has been the major constraint known to attack leguminous species especially to cowpea production. Identification of genetic variation of i. Alectra vogelii is a root parasitic weed mainly on economically important leguminous crops in a large part of the African continent. The extremely small seeds. Alectra vogelii (Benth.) is an angiosperm root hemi-parasite attacking C3 legumes in semi arid tropics; cowpea, groundnut, soybean and grams are the most.

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The parasite stimulates a proliferation of host lateral roots in the region around penetration and formation of the haustorium.

Catch-crops are alectrz species which are ploughed in or harvested after parasite attachment but before emergence and seed production. It grows up to 1 m tall. Yellow witchweed on cowpea. Parasitic weeds of the world: Breeding cowpea varieties for resistance to Striga gesnerioides and Alectra vogelii.

Journal of Applied Biosciences, The flowers wither and remain covering the developing globose seed capsule which swells to approximately 5 mm in diameter at maturity. Alectra alectra Vogeliii Category: Knowledge Bank home Change location.

Both species are known from the same areas of Cameroon and Malawi and in Malawi both have been observed growing in the same row of groundnuts. A new parasitic weed Alectra vogelii similar to Striga on groundnut in Ethiopia.

However, field observations demonstrate that the anthers will only release pollen when stimulated to do so by foraging insects Riches, ; Parker and Riches, Food vlgelii Agriculture Organization.

The biology of Alectra vogelii Benth., an angiospermous root parasite.

The alectfa of A. Delayed flowering, a reduced number of flowers and pods all contribute to yield loss. Reports of the species in association with non-crop legumes and occasionally non-legumes always involve weeds on fallow or cropped arable land. Four substances that stimulate A.


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References Top of page Anota T, We collect your name, email address, institutional affiliation and login credentials. The potential for controlling the weed by treating cowpea seed with the herbicide imazaquin before planting has been demonstrated but this practice has vogelil been commercialized Berner et al.

Prompt ploughing of crop residues after harvest will prevent continued seed production as host plants continue to grow on residual moisture.

PhD thesis, Reading, UK: Like most websites we use cookies. The effect of attack by Alectra vogelii Benth. South African Journal of Botany, 1 3: Fite reports on resistant landraces from Botswana, and finds that cultivars with thicker stems are negatively correlated with Alectra infection.

Alectra vogelii Benth.

Pretoria, Brooklyn, PretoriaSouth Africa. We may also use digital footprint connection information such as your IP address and other technical identifiers, to collect usage data, click stream data, and information about the pages you visited and searched, to analyse usage for the purpose of enhancing and improving our service.

The effect of certain strigol analogues on the seed germination of Alectra. Tropical Science, 46 3: Hutchinson J; Dalziel JM, Contact between parasite and host alectr quickly established. Summary of Invasiveness Top of page A. Buy Instant Access You are not logged in. The species is assumed to have an origin in West Africa and to have spread with human migrations and along vogelli routes with cowpea cultivation but no records exist on its first appearance in particular areas.


Taxonomic Tree Top of page Domain: Man is a dispersal agent through the xlectra of legume seed pods from aleftra stands. An assessment of its global invasive potential is given by Mohamed et al. Aspects of Applied Biology [Proceedings of ‘Agriculture: Recovery, isolation and preliminary structural investigation of germination stimulants produced by Vigna unguiculata Walp.

The results show that, there is high variability in cowpeas depending on number of the parasite emergence and time of emergence. Ancient, probably with spread of cowpea cultivation in Africa.

Hand-pulling should be carried out on lightly infested areas, particularly in alectta which have not previously had a history of infestation. Please sign in to access your subscribed products. All previous and subsequent major floras for West Africa Hutchinson and Dalziel, and south-eastern Africa Philcox, have maintained the name as A.

Soil Tolerances Top of page Soil drainage free Soil reaction acid neutral Soil texture light Special soil tolerances infertile. One or xlectra of the features that are needed to show you the maps functionality are not available in the web browser that you are using. The host range of Alectra vogelii Benth from Malawi and resistance in common bean and cowpea.