Cassava (Manihot esculenta) plants were observed in the Amazon region showing extensive leaf blight. The identity of the pathogen was confirmed based on morphological characteristics and the sequence of ITS region of the rDNA. Koch's postulates were fulfilled and pathogenicity was demonstrated. Cassava leaf blight, caused by Rhizoctonia solani AG-1 IA, is reported for the first time in Brazil.
O objetivo deste trabalho foi avaliar as características agronômicas e o desempenho vegetativo e produtivo de 12 variedades crioulas de feijão caupi [Vigna unguiculata (L.) Walp.]. O experimento foi conduzido no período de maio a setembro de 2016, na Fazenda São João, no município de Senador Guiomar – AC. Foram utilizadas 12 variedades crioulas de feijão caupi coletadas nas regiões do Alto Juruá e Alto Purus do Estado do Acre. As variedades crioulas utilizadas foram: Manteigão, Baiano, Costela de Vaca, Mudubim de Rama, Manteiguinha, Quarentão, Ceará, Leite, Fígado de Galinha, Branco de Praia, Arigozinho e Preto de Praia. O experimento foi realizado em blocos casualizados, com 12 tratamentos e quatro repetições. As variedades Leite e Mudubim de Rama destacaram-se com peso de 100 grãos em torno de 35 g. Para o comprimento de vagem, as variedades Costela de Vaca, Mudubim de Rama e Fígado de Galinha obtiveram comprimento de vagens acima de 20 cm. Na avaliação do Índice de grãos as variedades Arigozinho (80,68%), Leite (80,38%), Mudubim de Rama (78,84%) e Ceará (78,20%) se destacaram com as maiores médias. Para produtividade de grãos a média encontrada neste experimento foi de 1301 kg ha-1.
e sensitivity of four isolates of Clonostachys rosea, potential biocontrol agents of Botrytis cinerea, to fungicides, insecticides, and herbicides used in the strawberry crop was evaluated in vitro. All fungicides inhibited mycelial growth and conidia germination of all isolates. e insecticides decreased both as well, although less intensely than the fungicides did. e herbicides were the least toxic. Suitable spraying intervals of fungicides and usage of compounds less toxic to C. rosea are crucial to successfully manage strawberry gray mold.
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