Tank mixture of pesticides and their effect over pest control

• Autor(a) principal: Zandonadi, César Henrique Souza
• Data de Publicação: 2019
• Tipo de documento: Tese
• Idioma: eng
• Título da fonte: Repositório Institucional da UFU
• Texto Completo: https://repositorio.ufu.br/handle/123456789/24901; http://dx.doi.org/10.14393/ufu.te.2019.1229
• topic: CNPQ::CIENCIAS AGRARIAS; CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::FITOSSANIDADE; CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::FITOTECNIA; Cuticular penetration; Organosilicon adjuvant; Imidacloprid; Chlorantraniliprole; Physical-chemical characteristics; Manganese sulfate; Manganese nitrate; Scanning Electron Microscope (SEM); Tomato; Guava; Agronomia; Plantas - Doenças e pragas - Controle; Microscopia eletrônica de varredura; Pragas agrícolas - Controle; Cuticle; Mixtures; Surface tension; Pesticide efficacy; Guava psyllid; neonicotin; Effectiveness; Foliar fertilizer; Penetração cuticular; Adjuvante organosiliconado; Imidacloprido; Clorantraniliprole; Tomate; Goiaba; Características físico químicas; Eficácia controle; Sulfato de manganês; Nitrato de manganês; Microscópio Eletrônico de Varredura (SEM)

The use of different phytosanitary products aimed at reducing the damages caused by pests, diseases and nutritional deficiencies are of extreme importance to enhance the crops yield in field. The objective of this thesis was to evaluate the interaction between the tank mix of an organosilicon adjuvant, manganese foliar fertilizers and different insecticidal active ingredients on the physical-chemical characteristics and the active efficacy. The thesis was carried out in three complementary stages, the first being held at the University of Bonn in Germany and the last two at the Federal University of Uberlândia (UFU). In the first stage, the experiment was conducted to evaluate the influence of the organosilicon adjuvant on the cuticular penetration of chlorantraniliprole active and foliar fertilizers based on manganese (nitrate and sulphate). In the second stage the effect of the previous mixtures at the field level was evaluated at “Glória” experimental farm in Uberlândia, evaluating the effect of the mixture on the insecticide efficacy on the main pests in the tomato crop, as well as the effects on plant physiology and on the physical-chemical characteristics of the spray. In the third stage, which was carried out at “Água Limpa” experimental farm in Uberlândia, the effect of the mixture of foliar fertilizer based on manganese sulphate and organosilicon adjuvant on the efficacy of imidacloprid insecticide in guava crop was evaluated, as well as the effects of these mixtures in the physical-chemical characteristics of the spray. We observed in the first stage that the mixture of pesticides with foliar fertilizers and adjuvants is a very complex issue, while the result is, in most cases, little predictable under practical conditions. The physical-chemical evaluations changed according to each manganese salt added in the mixture. In the second stage, chlorantraniliprole showed efficacy and the mixture with manganese foliar fertilizers does not influence the efficacy of the insecticide nor the physiological characteristics of the plant. The addition of foliar fertilizer in the mixture reduced the pH and surface tension and increased the electrical conductivity and viscosity of the insecticidal solutions. In the third step we have that the organosilicon adjuvant reduced the surface tension and increased the viscosity and the pH. The number of nymphs and the level of infestation decreased with the treatments. The tank mix of organosilicon adjuvant and manganese foliar fertilizer did not influence the efficacy of the insecticide. We conclude that no change in the insecticide efficacy was observed in the evaluated experiments and regarding to the physical-chemical characteristics of the solutions, we observed that the addition of manganese foliar fertilizers and also the organosilicon adjuvant alter these characteristics.