Pesquisa Agropecuária Tropical (Oct 2010)

CONTROL OF ANGULAR LEAF SPOT BY USING PROTECTIVE MIXTURES IN IRRIGATED COMMON BEAN UNDER ORGANIC CROPPING SYSTEM CONTROLE DE MANCHA-ANGULAR UTILIZANDO-SE CALDAS FERTIPROTETORAS EM CULTIVO ORGÂNICO DE FEIJOEIRO IRRIGADO

  • Charles Martins de Oliveira,
  • Alberto Luiz Wanderley,
  • Wellington Pereira de Carvalho

DOI
https://doi.org/10.5216/pat.v40i4.6264
Journal volume & issue
Vol. 40, no. 4

Abstract

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<p style="margin-bottom: 0cm; font-style: normal; font-weight: normal; line-height: 120%; text-decoration: none;" lang="pt-BR" align="JUSTIFY"><span style="color: #000000;"><span style="font-family: Times New Roman,serif;"><span style="font-size: small;">A field experiment was carried out with the P&eacute;rola and BRS Valente cultivars, aiming to evaluate the efficiency of protective mixtures, in two spraying periods, for controlling angular leaf spot caused by <em>Phaeoisariopsis griseola </em>in common bean, under organic cropping system, in the dry season and under irrigation. A randomized complete block design, in a 2x4 factorial scheme, with four replications, was used, in which the first factor was the spraying intervals (15 and 30 days), and the second the protective mixtures (bordeaux, lime sulfur, and a mixture with silicate Rocksil<sup>&reg;</sup>) and control without any mixture. To the P&eacute;rola cultivar, the bordeaux mixture provided an increase of 17,7% in grain yield, when compared to the non-sprayed control, reducing significantly the angular leaf spot severity, achieving a control efficiency of 75%, and propitiating a profit of R$ 386.40 ha<sup>-1</sup>, when applied at each 15 days. To the BRS Valente cultivar, the bordeaux mixture and lime sulfur provided an increase of 25% and 21,8% in grain yield, in comparison to the non-sprayed control, achieving a control efficiency of 62% and a profit of R$ 573.15 ha<sup>-1</sup> and R$ 464.10 ha<sup>-1</sup>, respectively, when applied at each 15 days. </span></span></span></p> <p style="margin-bottom: 0cm; font-style: normal; font-weight: normal; line-height: 120%; text-decoration: none;" lang="en-US" align="JUSTIFY"><span style="color: #000000;"><span style="font-family: Times New Roman,serif;"><span style="font-size: small;">KEY-WORDS: <em>Phaeoisariopsis griseola</em>; <em>Phaseolus vulgaris</em>; organic agriculture; bordeaux mixture; lime sulfur.</span></span></span></p><p style="margin-bottom: 0cm; font-style: normal; font-weight: normal; line-height: 120%; text-decoration: none;" lang="pt-BR" align="JUSTIFY"><span style="color: #000000;"><span style="font-family: Times New Roman,serif;"><span style="font-size: small;">O objetivo deste trabalho foi avaliar a efic&aacute;cia de caldas fertiprotetoras, em dois intervalos de aplica&ccedil;&atilde;o, no controle de mancha-angular causada por <em>Phaeoisariopsis griseola</em>, em sistema org&acirc;nico de produ&ccedil;&atilde;o, no per&iacute;odo de inverno e sob irriga&ccedil;&atilde;o por aspers&atilde;o. O experimento foi desenvolvido a campo, com as cultivares de feijoeiro comum (<em>Phaseolus vulgaris</em> L.) P&eacute;rola e BRS Valente. Utilizou-se delineamento experimental de blocos ao acaso, em esquema fatorial 2x4, com quatro repeti&ccedil;&otilde;es, em que o primeiro fator correspondeu aos intervalos de aplica&ccedil;&atilde;o (15 e 30 dias) e o segundo a caldas fertiprotetoras (bordalesa, sulfoc&aacute;lcica e calda elaborada com silicato Rocksil<sup>&reg;</sup>) e testemunha sem controle da doen&ccedil;a. Para a cultivar P&eacute;rola, apesar de a efic&aacute;cia de controle da doen&ccedil;a ser semelhante &agrave; da calda sulfoc&aacute;lcica, somente a calda bordalesa proporcionou acr&eacute;scimo no rendimento de gr&atilde;os de 17,7%, em rela&ccedil;&atilde;o &agrave; testemunha, propiciando rentabilidade de R$ 386,40 por hectare. Para a cultivar BRS Valente, as caldas bordalesa e sulfoc&aacute;lcica, aplicadas quinzenalmente, proporcionaram acr&eacute;scimo ao rendimento de gr&atilde;os de 25,0% e 21,8%, em rela&ccedil;&atilde;o &agrave; testemunha, al&eacute;m de apresentarem efic&aacute;cia de controle de 62% da mancha-angular, propiciando rentabilidade de R$ 573,15 e R$ 464,10 por hectare, respectivamente.</span></span></span></p> <p style="margin-bottom: 0cm; font-style: normal; font-weight: normal; line-height: 120%; text-decoration: none;" lang="pt-BR" align="JUSTIFY"><span style="color: #000000;"><span style="font-family: Times New Roman,serif;"><span style="font-size: small;">PALAVRAS-CHAVE: <em>Phaeoisariopsis griseola</em>; <em>Phaseolus vulgaris</em>; agricultura org&acirc;nica; calda bordalesa; calda sulfoc&aacute;lcica.</span></span></span></p>

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