EPIDEMIOLOGICAL ASPECTS OF COTTON RAMULOSIS (Colletotrichum gossypii SOUTH. Var. cephalosporioides COSTA) ASPECTOS EPIDEMIOLÓGICOS DA RAMULOSE (Colletotrichum gossypii South. var. cephalosporioides Costa) DO ALGODOEIRO (Gossypium hirsutum L.)

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ID: 76996
2007
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Abstract
<!-- @page { margin: 2cm } --> <p class="western" align="justify">These experiments deal with the effects of outbreak of early, medium and late developing ramulosis on the IAC-13.l variety of cotton, which was seeded at three different intervals in Itauçu (Goiás—Brazil). The effects of the ramulosis on the height and weight of the plants, on the number of bolls, and on the weight of the cotton seeds and lints, were studied. The experiments were installed in a flat area of red latosoil. The experimental design was one of random blocks with six repetitions and the plants were classified, at the end of their vegetative growth, into the following categories: healthy, early ramulosis, medium ramulosis and late developing ramulosis. The early and medium ramulosis affected more significantly the studied parameters, and it was observed that varieties of cotton which were moderately resistant in relation to ramulosis, can be severely affected during growing seasons of heavy rains such as the 1975/76 season.</p>
<!-- @page { margin: 2cm } --> <p class="western" align="justify">Estudaram-se os efeitos da incidência precoce, mediana e tardia de ramulose sobre o peso e altura das plantas, número de capulhos, peso das sementes e da pluma de algodoeiro do cultivar IAC-l3.l em três épocas de semeadura (21/10/75, 21/11/75 e 23/12/75) no município de Itauçu (GO). O experimento foi instalado em região plana com latossolo vermelho. Foram utilizados blocos casualizados com seis repetições e plantas no final do ciclo vegetativo foram classificadas em quatro tipos: sadias, com ramulose precoce, com ramulose mediana ou com ramulose tardia. Concluiu-se que a forma precoce e também a mediana foram as que afetaram mais significativamente os parâmetros aferidos, e que cultivares tidos como de razoável comportamento em relação à ramulose, podem ser severamente afetados em anos agrícolas muito chuvosos como foi o de 1975/76.</p>
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Authors Calil, Fuad;Moraes, João de Deus;Carvalho, Yvo de;Pacheco, Quimico Iamamoto;
Journal pesquisa agropecuária tropical
Year 2007
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