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Notes On the Host Range, Ecology and Population Dynamics of Pratylenchus Brachyurus

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For more content, see Nematology.

Pratylenchus brachyurus was studied under conditions prevailing on the Transvaal Highveld, where it is a serious pest on potatoes. It has a relatively wide host range, including many of the crops and weeds growing on the Transvaal Highveld. Soil populations of this parasite decrease during winter as a result of the lack of host plants, drought conditions and low temperatures. The population quickly builds up on maize and potatoes. In the latter, both the roots and tubers become infested as soon as they develop. Visible lesions on the tubers first appear 4 to 5 months after planting. Freshly lifted potatoes may therefore be infested although they appear completely healthy, and thus spread the disease. During winter the largest part of the population was found in the organic material, which constituted less than 1% by weight of the soil.

Affiliations: 1: Plant Protection Research Institute, Pretoria, South Africa


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