Successful utilisation of allelochemicals in management of plant-parasitic nematodes depends on their degree of phytotoxicity. Conventional methods of determining phytotoxicity are tedious, with inconsistent results. Plants respond to increased dosages of allelochemicals in a density-dependent growth pattern, which allows the use of the Curve-fitting Allelochemical Response Data computer-based model to determine the mean dosage stimulation range of used allelochemicals. The CARD modelling was used to determine the stimulation range of fermented dried crude extracts of wild cucumber (Cucumis africanus) fruit for improving growth of tomato (Solanum lycopersicon) plants, each infested with 1500 eggs and juveniles of the southern root-knot (Meloidogyne incognita) nematode. Dilutions at 0, 2, 4, 8, 16, 32 and 64% were applied weekly through irrigation system. At 56 days after treatment, CARD demonstrated density-dependent growth patterns as dosages increased. The mean dosage stimulation range of diluted fermented crude extracts, computed from CARD biological indices, was 2.64% dilution for tomato plant. Since at 2% dilution, the material reduced final nematode population density of M. incognita by 90%. The 2.64% was suitable for stimulation of tomato plant and suppression of nematode numbers.
O presente trabalho objetivou-se na avaliação dos problemas fitossanitários da cultura da Berinjela e Tomateiro no Campo Experimental do Instituto Superior Politécnico do Cuanza Sul e fornecer apoio técnico, que foi realizado no período de janeiro a fevereiro de 2022 para conclusão do módulo de Tópicos especiais em Proteção de Plantas. Durante a realização do trabalho foi utilizada os seguintes métodos: Recolha de informações através da pesquisa Bibliográfica, Método descritivo e pesquisa de campo através de uma observação. Relativamente aos resultados se pode constatar que a Berinjela de variedade melhorada, nos seus frutos apresentavam um sintoma de antracnose. E quanto a praga encontrada nas margens inferiores das folhas foi a mosca branca. Para o caso da Berinjela de variedade local constatou-se a presença de sintomas da cercosporiose. No que concerne ao tomateiro podemos observar que as folhas estão atacadas pela pinta-preta ou mancha-de-alternaria (Alternaria solani).
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