Abstract
ABSTRACT Coffee production faces challenges due to the susceptibility of the crop to insects. Owing to the coffee leaf miner Leucoptera coffeella, which is one of the main insect pests, the technology for the application of phytosanitary measures becomes the main challenge for coffee growers. This study aimed to evaluate the effectiveness of coffee leaf miner control using different methods of application. The study was conducted in an experimental site in the municipality of Monte Carmelo - Minas Gerais. Spray depositions in different positions of the plant canopy and the effective control of coffee leaf miner were evaluated using the following application treatments: a hydropneumatic sprayer with varying spray volumes (200 and 400 L ha-1), two hollow-cone spray nozzles with the presence and absence of agricultural adjuvant, and electrostatic application using a spray volume of 200 L ha-1 with and without spray adjuvant. The addition of an adjuvant to the spray did not influence coffee leaf miner control; in contrast, a spray volume of 200 L ha-1 combined with the application of coarse droplets was efficient in the management of insect pest. The reduction in the rate of the application using coarse droplets increased the operational capacity and reduced spray drift potential.
Highlights
Brazil is the world’s largest producer and exporter, and the second-largest consumer of coffee
The present study aimed to evaluate the effectiveness of coffee leaf miner control using hydropneumatic and electrostatic spraying methods based on different spray volumes and spray nozzles, with and without the addition of an agricultural adjuvant
While evaluating spray depositions at different canopy positions, a significant effect on the interaction among the absence and presence of an adjuvant, spray nozzle, and spray volume was observed at the middle height and internal position as well as the upper height and external depth of the branch
Summary
Brazil is the world’s largest producer and exporter, and the second-largest consumer of coffee. Coffee farmers face numerous challenges due to the occurrence of pathogens and insects in plantations (Carvalho et al, 2012); a major insect pest is the coffee leaf miner, Leucoptera coffeella (Guérin-Mèneville & Perrottet, 1842) (Lepidoptera: Lyonetiidae) (Costa et al, 2015). Hydropneumatic sprayers are used extensively in coffee plantations (Sousa Júnior et al, 2017b). As stated by Silva et al (2014), in addition to the spray nozzles, the spray volumes adopted during applications should aim to wet the leaves considerably while avoiding spray loss due to soil drainage. Decaro Júnior et al (2015), while analyzing the effect of reduced spray volumes in coffee leaf miner control, found that a spray volume of 200 L ha-1 achieved an insect control effectiveness of 80% As stated by Silva et al (2014), in addition to the spray nozzles, the spray volumes adopted during applications should aim to wet the leaves considerably while avoiding spray loss due to soil drainage. Decaro Júnior et al (2015), while analyzing the effect of reduced spray volumes in coffee leaf miner control, found that a spray volume of 200 L ha-1 achieved an insect control effectiveness of 80%
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