RESUMO Comparou-se a eficiência de fungicidas no controle de Phaeoisariopsis griseola e Colletotrichum lindemuthianum na cultura do feijoeiro (cv. IAC Carioca), em condições de campo, em Capão Bonito, SP. O delineamento estatístico de blocos ao acaso 12 tratamentos e 4 repetições, sendo cada parcela constituída por 4 linhas com 5,0m de extensão espaçadas de 0,50m. Os fungicidas utilizados, ordem de aplicações e respectivas doses em g i.a./ha foram: 1-azoxystrobin (1ª, 2ª e 4ª) (40), 2-azoxystrobin (1ª e 2-ª) (40) e hexaconazole + chlorothalonil (3ª e 4•) (630), 3-azoxystrobin (1a, 2a, 3ª, 4ª) (40), 4-azoxystrobin (1ª e 2ª) (40) e fentin hidróxido (3ª e 4ª) (280), 5- fentin hidróxido (1ª, 2ª, 3ª, 4ª) (280), 6-tebuconazole (Ja, 2ª, 3ª, 4ª) (200), 7- tebuconazole +fentin hidróxido (Jil, 2a, 3ª, 4ª) (500 + 100), 8-azoxystrobin (1ª, 3ª, 4ª) (40), 9-tetraconazole (Ja, 2ª, 3a, 4n) (70), 10-difenoconazole (1ª, 2•, 3ª, 4ª) (100), 11-mancozeb (lª, 2ª, 3ª, 4ª) (2000) e 12- testemunha. As avaliações foram realizadas por ocasião da 4ª aplicação e 15 dias após, utilizando-se escala de estimativa de porcentagem (1 a 9) de área afetada pela antracnose e mancha angular. Avaliou-se ainda o grau de infecção (GI %), representado pela porcentagem média ponderada da severidade destas doenças nas vagens e o "stand" final, o número de vagens por metro linear, o peso de grãos e o rendimento. Para o contrnle da mancha angular, os tratamentos com azoxystrobin, tebuconazole + fentin hidróxido, tebuconazole e difenoconazole foram os mais eficientes, ficando num grupo intermediário o tetraconazole, azoxystrobin e fentin hidróxido. Para antracnose, sobressaíram tebuconazole + fentin hidróxido, azoxystrobin e fentin hidróxido seguidos de difenoconazolee tetraconazole. Considerando as diversas variáveis, os melhores resultados foram obtidos com os fungicidas azoxystrobin {em 4 aplicações), tebuconazole + fentin hidróxido, fentin hidróxido e azoxystrobin (1ª, 3ª e 4ª), que também proporcionaram aumentos significativos de rendimento, da ordem de 52 a 60%, superiores à testemunha. Não se observaram efeitos fitotóxicos dos fungicidas.
ABSTRACT The efficiency of fungicides on the contrai of common bean (Phaseolus vulgaris L.) anthracnose and angular leaf spot (Colletotrichum lindemuthianum and Phaeoisariopsis griseola) was studied under field conditions at the Instituto Agronômico Experiment Station, at Capão Bonito, state of São Paulo, Brazil. The experiment was a randomized block design with 12 treatments and 4 replications. Fungicides were sprayed 4 times every 15 days using a manual sprayer, starting 20 days after emergence of the plants. The fungicide treatments, number, sequence of spraying, and rate of application (active ingredient, g/ha) were respectively: 1-azoxystrobin (1st, 2nd and 4th) (40), 2-azoxystrobin (1stand 2nd) (40) and hexaconazole + chlornthalonil (3rd and 4th) (630), 3-azoxystrobin (1st, 2nd, 3rd, 4th) (40), 4-azoxystrobin (1st and 2nd) (40) and fentin hydroxide (3rd and 4th) (280), 5-fentin hydroxide (1st, 2nd, 3rd, 4th) (280), 6-tebuconazole (1st, 2nd, 3rd, 4th) (200) 7-tebuconazole+ fentin hydroxide (1st, 2nd, 3rd, 4th) (500 + 100), 8-azoxystrobin (1st, 3rd, 4th) (40), 9-tetraconazole (1st, 2nd, 3rd, 4th (70), 10-difenoconazole (1st, 2nd, 3rd, 4th) (100), 11-mancozeb (1st, 2nd, 3rd, 4th) (2000) and 12-unsprayed control. The effect of the treatments was evaluated using a grade system varying from 1 to 9 based on the percentage of estimated infected area. Other measurements included the infection degree (weighed percentage of severity of disease on bean pods), the final stand, the number of the pods, the weight of 100 grains and thegrain yield. All fungicide treatments reduced the infection by P.griseola compared with the unsprayed plants. The most efficient fungicides were azoxystrobin, tebuconazole + fentin hydroxide, tebuconazole and difenoconazole, followed by the treatments with tetraconazole, azoxystrobin (1st, 2nd) and fentin hydroxide (3rd, 4th) and azoxystrobin (1st, 3rd and 4th) in the intermediate group. Anthracnose was better controlled by tebuconazole + fentin hydroxide, azoxystrobin (1st, 2nd) and fentin hydroxide (3rd, 4th). Azoxystrobin (1st, 3rd, 4th), difenoconazole and tetraconazole were also efficient. Plant population at harvest and the number of pods per meter of row were not affected by the treatments. Considering all variables analised the best results were obtained with the fungicides azoxystrobin (1st, 2nd, 3rd, 4th), tebuconazole + fentin hydroxide, fentin hydroxide and azoxystrobin (1st, 3rd, 4th), which also showed increment in yield.