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  • Organic phosphorus and plant… The fraction of organic phosphorus that is available for plants is very small and not enough for the plant to grow properly. Compared to nitrogen…
  • Blosyrus inaequalis beetle in… Blosyrus inaequalis is mostly found in Siri-Lanka and India, but lately also in the northern parts of South Africa. So far the economical damage cause…
  • Sweet potato weevil (Cylas… Sweet potato weevil((Credit of featured image by Author Graham Wise from Brisbane, Australia https://commons.wikimedia.org/wiki/File:Cylas_formicarius_(14576849194).jpg)) can be devastating in Africa. losses between 73((N.E.J.M.Smit,“The effect of the…
  • Propagating, planting and harvesting… Planting material Sweet potatoes are propagated vegetatively through vines (or runners) which are cut up in cuttings, each 300-400mm long. Most other crops are propagated…
  • Butternut fertilizer application tables… Butternut((Featured image by: Butternut Citrouille Courge - Photo gratuite sur Pixabay)) (Cucurbita moschata) fertilizer requirements can be calculated if you know your soil type and…
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Sweet potato weevil (Cylas formicarius)

Sweet potato weevil1)Credit of featured image by Author Graham Wise from Brisbane, Australia https://commons.wikimedia.org/wiki/File:Cylas_formicarius_(14576849194).jpg can be devastating in Africa. losses between 732)N.E.J.M.Smit,“The effect of the indigenous cultural practices of in-ground storage and piecemeal harvesting of sweetpotato on yield and quality losses caused by sweetpotato weevil in Uganda,” Agriculture, Ecosystems and Environment,vol.64,no. 3, pp. 191–200, 1997.-1003)K.…

Root knot nematode

Root knot nematode, Meloidogyne spp., are small round worms present on the roots and must not be confused with root knots of Rhizobium spp., which are actually good for the plant. Legume nodules are smaller and pinkish inside while Root Knot galls are distorted and have abnormal branches. Root Knot infestation just looks bad compared…

Beet cyst nematode (Hetrodera schachtii)

Beet cyst nematode

When susceptible crop plantings follow at close intervals i.e. within 12 months or less, beet cyst nematode builds up in the soil to damaging population concentrations. High populations may reduce the yield by 20-40%. The beet cyst nematode was found in vegetable lands around cities such as Johannesburg, Pretoria, Cape Town and Durban, Pinetown, Port…