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URI permanente desta comunidadehttps://thoth.dti.ufv.br/handle/123456789/3352
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Item Eficiência de diferentes ramais de pulverização e volumes de calda no controle de Brevipalpus phoenicis na cultura do café(Sociedade Brasileira De Entomologia, 2010) Fernandes, Ana Paula; Ferreira, Marcelo da Costa; Oliveira, Carlos Amadeu Leite deEfficiency of different spraying lances and spraying volumes on the control of Brevipalpus phoenicis in coffee crops. The mite Brevipalpus phoenicis is found on coffee plantations in Brazil since the 1950’s. Responsible for indirect losses due to its role as vector of a virus disease, this mite species often requires control measures, the most common based on mitecide spraying. It was evaluated the mortality of B. phoenicis due the coverage of spraying liquid applied on coffee plants, with two types of lances used in air assisted sprayers and four spraying volumes. Treatments were applied with mitecide abamectin (Vertimec 18 CE® at 0.4 L per hectare), in volumes of 250, 400, 550 and 700 L per hectare, with two types of lances for the nozzles. The control efficiency against B. phoenicis, deposition and coverage by spray liquid on coffee plants was evaluated. Experimental delineation was in randomized blocks, with eight treatments plus a check plot in four replications. The statistical analysis was carried in a factorial scheme 2x4+1. No significant differences in the number of mites were found between treatments. As regards spraying liquid deposition, it was observed an increment with increasing spraying volumes, with the plant tops showing the best deposition of spraying liquid. The duplication of the lances (nozzle branches) resulted in a significant increase in control efficiency for B. phoenicis compared with conventional branch and with check plot, without dependence of spraying volume.Item Reducing spray volume for the control of Leucoptera coffeella (Lepidoptera: Lyonetiidae) in coffee plants(Editora UFLA, 2015-10) Decaro Junior, Sergio Tadeu; Ferreira, Marcelo da Costa; Lasmar, Olinto; Fouquet, GuntherThe present work evaluated reducing on spray volume for the control of Leucoptera coffeella (Guérin-Mèneville & Perrottet, 1842) (Lepidoptera: Lyonetiidae) in coffee. Were used a conventional sprayer to apply the volumes 200 and 400 L ha -1 and an ultra-low-volume (ULV) sprayer to apply 46, 67 and 92 L ha -1 . Sprays utilized 800 mL ha -1 of the insecticide profenofos+lufenuron. The tracer MnSO 4 was mixed to the spraying liquids at 20 g L -1 . Leaves were collected from different parts of the coffee tree to evaluate the volume of insecticide spraying liquid deposited. For the L. coffeella control, leaves were collected before and 7, 14, and 21 days after spraying (DAS) to evaluate the number of live and dead L. coffeella larvae. Data were subjected to variance analysis and the means compared by Tukey’s test (p<0.05). There was no significant difference for spraying liquid deposit between the volumes of 200 and 400 L ha -1 , as well as among the ULVs at 46, 67 and 92 L ha -1 , however with lower deposit for the latter, compared to the two higher volumes. The estimated insecticide volume deposited was significantly higher for the 200 L ha -1 . The untreated control had higher number of live L. coffeella larvae compared to the sprays at 7 and 21 DAS, as exception for the 14 DAS. The volume of 200 L ha -1 by the conventional sprayer and 92 L.ha -1 by the ULV sprayer may be adopted for coffee plantations providing insecticide deposit and control of L. coffeella with efficiency above 80%.