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 deposition 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.
Highlights
One of the major problems faced by farmer is the coffee plants susceptibility to various pests and diseases, which appear from the nursery to the crop in the field, raising costs and reducing production and the final product quality (CARVALHO et al, 2012)
The leaf miner, Leucoptera coffella (Guérin-Mèneville), is the main pest of the crop in Brazil, since it is favored by hot and dry seasons and by the management type applied in the coffee production
The farmer is increasingly required of the proper and judicious use of pesticides; what you see in the field, mainly in coffee production, is the lack of information about applicat ion technology
Summary
One of the major problems faced by farmer is the coffee plants susceptibility to various pests and diseases, which appear from the nursery to the crop in the field, raising costs and reducing production and the final product quality (CARVALHO et al, 2012). The leaf miner, Leucoptera coffella (Guérin-Mèneville), is the main pest of the crop in Brazil, since it is favored by hot and dry seasons and by the management type applied in the coffee production. In technified and high yield potential crops, the chemical control is the most used method to contain pests infestations and disease incidence, in the absence of more effective alternatives. The farmer is increasingly required of the proper and judicious use of pesticides; what you see in the field, mainly in coffee production, is the lack of information about applicat ion technology. The applications often are neither efficient nor effective because the best technique or equipment was not used (CUNHA et al, 2011; STEFANELO et al, 2014)
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