科研之友
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摘要
Apesar de a 芍rea de milho safrinha ter aumentado em aproximadamente dez vezes nos 迆ltimos 15 anos, poucos estudos sobre doen as foram relatados nesse ambiente espec赤fico. O presente trabalho teve como objetivo avaliar o efeito da popula o de plantas na incid那ncia de doen as de colmo em milho safrinha. O experimento foi instalado emToledo/PR por dois anos agr赤colas consecutivos (2004 e 2005). O delineamento experimental foi em blocos casualizados com 4 repeti es, em esquema fatorial, tendo como primeiro fator os h赤bridos (X1392D, 30F80, 30K75 e 30P70) e como segundo fator as popula es de plantas (45, 60 e 75 mil plantas ha-1). Foram avaliadas as doen as de colmo causadas por Stenocarpella sp., Fusarium sp. e por Colletotrichum graminicola, acamamentos de raiz e de colmo, al谷m da incid那ncia geral de doen as da base do colmo e produtividade. O aumento da popula o de plantas resultou em aumento das doen as de colmo nos h赤bridos avaliados, por谷m n o influenciou a produtividade na mesma propor o. Although the off season corn area had almost a tenfold increase duringthe last 15 years, few studies about diseases were reported on this specific environment. The objective of the current study was to evaluate the effect of plant population on corn stalk disease at the off season environment. The experiment was installed in Toledo/PR for two consecutive years (2004 and 2005). The design was a randomized complete block with 4 replications, on a factorial scheme with hybrid as the first factor (X1392D, 30F80, 30K75 and 30P70) and plant population as the second factor (45, 60 and 75 thousand plants ha-1). The incidence of Stenocarpella sp., Fusarium sp., Colletotrichum graminicola, stalk lodging, root lodging, general stalk base diseases and yield were evaluated. The increased plant population showed a different increase in the stalk disease pattern through the hybrids and years tested, however it has not interfered with the yield in the same proportion.
