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Identificação do género Striga em Angola. Combate de Striga asiatica em milho
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Autores
Orientador(es)
Resumo(s)
Striga asiatica is the major constraints in maize (Zea mays) production in Angola.
Since S. asiatica seedbanks are long-lived, control strategies that affect the
seeds emergence and parasitism are necessary. Low soil fertility, namely
phosphorus and nitrogen amount, is another factor that directly affects maize
yield. Hence, this study aimed to: i) identify Angola Striga specimenes from
portuguese Herbaria and collected nowadays in field surveys; ii) elaborate a
dichotomic key to identify Striga species; iii) genus Striga distribution; iv) find
Striga asiatica management strategies in maize, e.g. addition of nitrogen, several
Fabaceae and Tripsacum intercropping, and herbicide control (imazapyr seed
coating resistant maize). Striga species identifieds: S. aequinoctialis, S. asiatica,
S. bilabiata ssp. bilabiata, S. elegans, S. forbesii, S. gesnerioides, S.
hermonthica, S. hirsuta, S. linearifolia e S. macrantha e S. strigosa (synon. S.
angolensis). T. laxum duplicated S. asiatica emergency comparatively to the
maize. Reductions in the S. asiatica emergence were achieved with nitrogen
addition, legumes intercropping and imazapyr. Maize yield increased with all
tested control methods. Imazapyr was effective in controlling S. asiatica and
Tripsacum rapidly reduces Striga seed bank in the soil.
Descrição
Doutoramento em Engenharia Agronómica - Instituto Superior de Agronomia
Palavras-chave
Fabaceae Tripsacum intercropping nitrogen taxonomy
Contexto Educativo
Citação
Dovala, A.C. - Identificação do género Striga em Angola. Combate de Striga asiatica em milho. Lisboa: ISA, 2014, 178 p.