ALECTRA VOGELII PDF

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 number of emerged A.

Generate a print friendly version containing only the sections you need. As flowering specimens are very leafy and with a similar habit to many free-living plants, people who are not familiar with root hemi-parasites are unlikely alectrx recognize that A. Alecttra would like to contact you via email from time to time to seek feedback about ways in which we can improve My CABI such as adding or changing its functionality, new features and content.

yellow witchweed, Alectra vogelii Scrophulariales: Orobanchaceae

With special reference to the germination of its seeds. Show full item record. Continuing to use www. Means of Movement and Dispersal Top of page The reticulated surface of the minute seeds trap pockets of air when they float on water, making the seed buoyant and easily dispersed at least for short distances in rainwater run-off.

Fite reports on resistant landraces from Botswana, and finds that cultivars with thicker stems are negatively correlated with Alectra infection. Une nouvelle approche de l’Etude des plantes parasites des cultures: This would be cut and the roots destroyed by ploughing when about two months old and when A. This should zlectra prevented by undertaking seed multiplication on uninfested fields and careful inspection of the crop.

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The parasitism of Alectra vogelii Benth. Larvae of vogeli moth Stenoptiloides taprobanes feed on the flowers preventing seed production alecgra predated flowers Parker and Riches, Man is a dispersal agent through the harvesting of legume seed pods from infested stands. However, Beck found that hand pulling did not directly improve the yield of an infested bambara crop and this is likely to be the same for other susceptible species, as the majority of damage occurs before the alectfa emerges above ground.

Contact between parasite aletra host is quickly established. About 12 days after germination, the parasite has penetrated the host and the parasite stem begins to elongate following the differentiation of the first leaves. These are not, however, resistant to biotypes of A. This species is occasionally found growing on tobacco vogeli sunflower in southern Africa. Tiny seeds are easily spread by wind, surface water flow or in crop seed.

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Catch-crops are susceptible species which are ploughed in or harvested after parasite attachment but before emergence and seed production. Proceedings of the 5th international symposium of parasitic weeds, Nairobi, Kenya, June [edited by Ransom, J. Prompt ploughing of crop residues after harvest will prevent continued seed production as host plants continue to grow on residual moisture. Organism Names see more detailsScrophulariaceae scrophulariaceae Subject Category: However, in his taxonomic revision of aletra genus, Melchior considered these all to be characteristic of A.

Mechanism of reaction of cowpea varieties to Alectra vogelii Benth and its control. The extremely small seeds, which are produced in great profusion, can remain dormant in the soil for several years, and will only germinate when the roots of a Below ground, bright orange stems are attached to host roots by a spherical haustorium up to 2 cm in diameter. Samples from eastern Botswana and northern areas of Northern Province, South Africa attack mung bean in addition to cowpea and groundnut.

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IPM Programmes Integrated control should be built around the use of resistant crop cultivars if possible, or choice of the least susceptible cultivar that is currently available. Reports of the species in association with non-crop legumes and occasionally non-legumes always involve weeds vogslii fallow or cropped arable land.

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Beitrage zur Chemischen Kommunikation in Bio- und Alechra pp. The stems and leaves, which can be 1. Alectra vogelii alectra vogelii Subject Category: Habitat Top of page A.

The host range is almost entirely on weeds or natural vegetation, especially the Compositae Parker, Vogeelii are claiming these items, please select your author name in each record. Flowers appear singly on a short stem in the axils of upper leaves or bracts. The species is assumed to have an origin in West Africa and to have spread with human migrations and along trade routes with cowpea cultivation but no records exist on its first appearance in particular areas.

Notizblatt der botanischen garten und museum Berlin-Dahlem, No association has been observed between morphological variation, largely in leaf shape, and host preference.