Diagrammatic scale for the quantification of black spot severity in papaya leaves by Helenilson Oliveira Francelino, Marcelo Vivas, Ramon de Moraes, Júlio Cesar Gradice Saluci, Janiele Maganha Silva Vivas, Derivaldo Pureza da Cruz, Geraldo de Amaral Gravina, Silvaldo Felipe da Silveira

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