Controle químico do pulgão com distintas doses de agrotóxicos aplicadas via pulverização e insetigação no meloeiro fertirrigado

• Ano de defesa: 2013
• Autor(a) principal: Bomfim, Guilherme Vieira do
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Palavras-chave em Português: Engenharia agrícola; Cucumis melo L.; Aphis gossyppi G.; Quimigação; Chemigation
• Link de acesso: http://www.repositorio.ufc.br/handle/riufc/18943

The research purpose was to evaluate the effects of application methods and agrotoxic doses undermelon aphid chemical control. Two experiments were conducted at Fortaleza, Ceará, Brazil (3° 44' S, 38° 33' W and 19.5 m). The experimental design was randomized blocks in factorial 2x4, with eight treatments, four replicates and plots of four useful plants. The treatments comprehend ed two application forms (manual knapsack sprayer and insetigation) and four doses (0, 50, 100 and 200 % of manufacturer’s recommended dose) of the acephate and thiametoxan insecticides. The first experiment was made with agrotoxic fixed concentration whereas the second one was made with an increasing concentration. The assessment was made for the variables: control efficiency (EF), fresh mass (MF), polar diameter (DP) and equatorial (DE), fruits per plant number (NF), business productivity (PC), thickness of the shell (EC) and pulp (EP), soluble solids (SS) and firmness pulp (FP). After assessment, residual agrotoxics and simplified economics assays were made. The insetigation were similar to manual knapsack sprayer. In the first experiment, the greatest efficiency value (98.97%) was estimated with 13 9.64% acephate dose. In the second experiment, the greatest efficiency value (99.93 %) was estimated with 138.33 % acephate dose. The thiametoxan didn’t influence the EF (100 % for all treatments). The best results on the first (NF, PC and SS) and second (NF and PC) experiments were provided with 100 and 200 % recommended dose for each agrotoxic. The fruits didn’t have agrotoxic residues. The best profit was achieved with 100 and 200 % of the recommended dose.