ABSTRACT:Studies on the quality of applications of plant protection products on coffee crops are lacking. Thus, we studied spray deposition on coffee leaves and losses to the soil from hydropneumatic spraying at different spray volumes and with and without an electrostatic charge. The experiment was set up using randomized blocks in a factorial design (4 x 2 + 1). Spray deposition on the upper, middle and lower parts of the canopy and losses to the soil were evaluated using Brilliant Blue tracer. Applications were made at 200, 300, 400 and 500 L ha -1 with a conventional airblast sprayer (axial fan type) and an airblast sprayer with directed air jets. Applications were also made with an electrostatic sprayer at 130 L ha -1 . Electrostatic spraying resulted in greater spray deposition on the lower part of the coffee canopy compared to non-electrostatic spraying. On the lower and middle parts of the plants, the sprayer equipped with directed air ducts performed better than the sprayer with nozzles arranged along the lateral arcs (axial). The spray volume of the airblast sprayers without electrostatic charge (200 to 500 L ha -1 ) did not influence spray deposition on the plant leaves and losses to the soil, which were lower with the electrostatic sprayer.

ABSTRACT:The coffee crop requires great spray ability to penetrate into the plant canopy during the application of pesticides. The aim of this study was to evaluate the spray deposition on leaves of coffee plants and the chemical control of the leaf miner provided by the application of different spray nozzles, with and without the use of an auxiliary boom. The deposition on the upper, middle and lower parts of the plants and the losses to the soil were evaluated using a tracer quantified by spectrophotometer. We also evaluated the chemical control of the leaf miner, counting the larvae, after the application of the insecticides cartap and fenpropathrin. The trial was carried out in a randomized block design, with four replications, in a factorial model (2×2+1): with and without the auxiliary boom, three spray nozzles (hollow cone -MAG 02, flat fan -AD 11002 and air induction hollow cone -TVI 8002) and a control. The use of the auxiliary boom increased the deposit ion in the lower part of the plants but decreased in the middle part, besides the increase in the runoff. The different nozzles do not provided differences in the deposition, showing the technical feasibility in the use of the hollow cone nozzles with coarse droplets and flat fan. All the chemical control decreased the leaf miner population, without differentiation.

Louvo a Deus sobre todas as coisas. Foi Ele quem criou a terra e os seres vivos convivendo em perfeita harmonia e, através de um sopro do Espírito Santo, deu vida ao homem. Foi Ele que me conduziu até aqui. A Ele toda honra e toda a glória! Agradeço de forma especial a minha mulher amada, Sinara de Oliveira Santos. Minha eterna companheira e meu eterno amor. As minhas filhas, Isabella Herber Gitirana, Marianna Herber Gitirana e Lia Santos Gitirana, grandes incentivadoras e razões especiais do meu viver. À Universidade Federal de Uberlândia, a todos seus professores, alunos e servidores, pelo convívio e a oportunidade de estudar. Ao meu orientador, João Paulo Arantes Rodrigues da Cunha, pela confiança, orientação, atenção e cuidado, especialmente dedicados a essa jornada.

No abstract