Comportamento de cultivares de milho quanto ao rendimento e susceptibilidade a pragas e doenças na província do Huambo (Angola) Behaviour of maize varieties concerning the production and pests and diseades susceptibility in Huambo country (Angola)

Revista de Ciências Agrárias

关键词: Brocas;    período vegetativo;    produção;    vírus MSV;    Zea mays L;    Borers;    maize streak virus;    production;    vegetative period;    Zea mays L;   

DOI  :  

来源: DOAJ

【 摘 要 】

Os objectivos deste trabalho consistiram em avaliar o comportamento de cultivares regionais de milho - ‘Branco redondo’ e ‘SAM3’ - e importadas - ‘ZM423’, ‘ZM521’, ‘ZM523’, ‘ZM611’, ‘ZM621’ - quanto à sua sensibilidade a brocas do colmo e da espiga e à virose MSV (Maize Streak Virus). Os ensaios realizaram-se em três locais do Planalto Central de Angola na época seca e na das chuvas. Nas duas épocas e nos três locais, não se registaram infecções pelo vírus MSV nas cultivares regionais; todavia, nas importadas houve incidência da doença embora com baixa severidade. Em relação às brocas, não se observaram diferenças significativas entre as cultivares e a severidade foi baixa. A produção das cultivares importadas foi superior na época seca, com um rendimento entre as 7 e 8 t ha-1. Em sequeiro (época das chuvas) as cultivares importadas produziram, em média, entre 3 a 4 t ha-1. As cultivares locais não mostraram uma variação tão acentuada no rendimento entre as duas épocas. Em geral, os valores médios do rendimento da ’Branco redondo’ e ‘SAM3’ foram de 2 t ha-1, com excepção desta última na Chianga, que atingiu as 4 t ha-1 em sequeiro. A supremacia da ‘SAM3’ na época chuvosa na Chianga deve-se certamente ao facto de ter sido aí seleccionada.
The main objectives of this work were the evaluation of the behaviour of different traditional maize varieties - ‘Branco redondo’ and ‘SAM3’ - and imported ones - ‘ZM423’, ‘ZM521’, ‘ZM523’, ‘ZM611’, ‘ZM621’ - to their tolerance to the stem and earn borars and to the virus MSV (Maize Streak Virus), in three locations of the central highlands of Angola and in two cropping seasons (rainy and dry season). Maize yields were also evaluated. In the two growing seasons and in the three locations, the traditional varieties did not show any infection by the virus MSV. The imported varieties show disease symptoms but at a low incidence level. The severity of the maize stem and earn borars were low and no significant differences were observed between the tested varieties. The yields of the imported varieties varied between 7 and 8 t ha-1 in the dry season (irrigation) but in the rainy season their average yield decreased (3 to 4 t ha-1). The yield of the traditional varieties was similar in both growing seasons, in general lower than the imported ones. The average yield in ’Branco redondo’ and ‘SAM3’ varieties was 2 t ha-1. ‘SAM3’ variety production in Chianga was an exception; where the yield was 4 t ha-1 in the rainy season. Probably this can be explained by the fact that ‘SAM3’ was obtained in this region.

【 授权许可】

Unknown