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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Environmental Requirements As A. Stroud A; Parker C, Please enter a valid email address. Visser, ; Parker and Riches, If you want to include your highlights and annotations you must: Chancellor College, University of Malawi, The parasitism of Alectra vogelii Benth. Alectra vogelii is a root parasitic weed mainly on economically important leguminous crops in a large part of the African continent.

Elsewhere in West Africa, infestations tend to be more localized, as in southern Mali.

Alectra vogelii Benth.

Pigeon pea is the only widely grown vogeli legume which is not parasitized. The tubular corolla is formed of five petals fused towards the base, so that the flower is bell-shaped when open. You can choose to delete your My CABI account from your profile page, in which case, all your information will be deleted from our servers.

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Flora of Zimbabwe: Species information: Alectra vogelii

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. Cowpea landraces of Botswana: Plant Disease, 78 1: However, in his taxonomic revision of the genus, Melchior considered these all to be characteristic of A. Tropical Science, 46 3: Some herbivorous insects and gogelii diseases have been reported from A. Organism Names see more detailsplants plants Subject Category: Second objective, the 23 isolates of A.

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You are claiming these items, please select your author name in each record. Potential of imazaquin seed treatment for control of Striga gesnerioides and Alectra vogelii in cowpea Vigna unguiculata. Organism Names see more detailsScrophulariaceae scrophulariaceae Subject Category: We use this information to provide you with access to the My CABI service, to provide you with technical or product support, and to keep the service working securely.

In Botswana, grain or fodder cultivars of pearl millet and bambara, which is not attacked by the local biotype of the parasite, are potent stimulators of A. Flowers appear singly on a short stem in the axils of upper leaves or bracts.

From East Africa, Greathead and Milner have reported both Ophiomyia strigalis attacking roots and Platyptilia sp. Scrophulariaceae and their insect natural enemies in East Africa with a discussion on the possibilities of biological control.

yellow witchweed, Alectra vogelii Scrophulariales: Orobanchaceae

Die Gattung Alectra Thunb. The seed has no after-ripening requirement.

By and large these are found in semi-arid areas with a short growing season of 4 to 6 months, below m altitude. Leaf shape, particularly the nature and extent of toothing along the edge of the lamina, varies considerably.

Distribution Table Top of page The distribution in this summary table is based on all the information available. Alectra and Striga aspera in Burkina Faso. Photsynthetic characteristics of some South African parasitic flowering plants.

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Cultural Control Two options, catch and trap-cropping, are available for reducing the size of the A. Characterization of alectra vogelii witch weed strains using molecular markers in selected parts of Malawi and Tanzania Mwaipopo, Beatrice Victor. The anthers and filaments are glabrous.

Tropical Agriculture, 48 2: Seeds of the parasite may contaminate grain aletra seeds during threshing and be transported to markets or neighbouring farms during local sales. No association has been observed between morphological variation, largely in leaf shape, and host preference. 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 suitable host, which produces a germination stimulant, come close to the seed.

Improved cowpea cultivars which combine resistance to A. Continuing to use www. Actions Tools Choose a colour. The flowers wither and remain covering the developing globose seed capsule which swells to approximately 5 mm in diameter at maturity.

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 Federal Noxious Weed List.