Chemical Control of Mycosphaerella Leaf Disease on <i>Eucalyptus dunnii</i> in Southern Brazil

Garrett, Alexandre Techy de Almeida; Camargo, Mariane Bueno de; Garcia, Flávio Augusto de Oliveira

doi:10.1590/2179-8087.015017

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Original Article, Silvicultura • Floresta Ambient. 25 (2) • 2018 • https://doi.org/10.1590/2179-8087.015017 copy

Chemical Control of Mycosphaerella Leaf Disease on Eucalyptus dunnii in Southern Brazil

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Mycosphaerella leaf disease (MLD) is a dangerous disease for eucalypt plantations; however little information is available regarding its control using fungicides in South America. In this study, we evaluated MLD control, and growth in young stands of Eucalyptus dunnii clones (C18 and C25). After two applications of azoxystrobin + cyproconazole (0.3 L/ha^-1 and 0.45 L/ha^-1), with a spraying volume of 200 L/ha ^-1, and trifloxystrobin + tebuconazole (0.5 L/ha^-1 and 0.75 L/ha ^-1), with a spraying volume of 100 L/ha^-1, mean severity reduction for apical branches of C18 was 74%. For middle branches, application of trifloxystrobin + tebuconazole at 0.5 L/ha^-1 reduced severity by 27% in C18. While fungicide applications did not affect growth in height or root collar diameter, our results suggest that the application of fungicide can deter disease progression throughout the plant. Therefore, the monitoring of disease outbreaks is crucial to enable effective, early application.

Keywords:
silviculture; fungicide; leaf spot

Fungicide Treatment	Crown Portions
	---Apical Branches---		--Middle Branches--		-----Basal Branches----
	C18	C25	C18	C25	C18	C25
WFA	2.70 a	3.89 a	39.41 a	56.58 a	66.52 a	36.18 a
F1	0.68 b	3.02 a	28.87 b	55.47 a	60.18 a	33.60 a
F2	0.74 b	2.17 a	34.84 ab	54.78 a	68.91 a	33.36 a
F3	0.32 b	2.99 a	34.55 ab	53.46 a	62.93 a	35.50 a
F4	0.54 b	3.43 a	32.86 ab	55.55 a	66.97 a	34.50 a
CV (%)	21.88	20.15	8.87	7.50	12.91	15.86
p-value	<0.0001	0.0805	0.0342	0.9123	0.7249	0.9602

Treatment	Height (m)		Root Collar Diameter (cm)		Severity at beginning		AUDCP
Treatment	C18	C25	C18	C25	C18	C25	C18	C25
WFA	1.38 a	1.08 a	2.45 a	1.64 a	22.07 a	44.08 a	108.63 a	96.64 a
F1	1.29 a	1.02 a	1.84 a	1.42 a	17.92 a	46.82 a	89.64 a	92.09 a
F2	1.29 a	1.44 a	1.89 a	2.04 a	25.65 a	42.45 a	104.40 a	90.30 a
F3	1.06 a	1.21 a	1.78 a	1.55 a	15.01 a	43.58 a	97.68 a	91.95 a
F4	1.32 a	1.42 a	1.84 a	1.98 a	29.57 a	44.44 a	100.29 a	93.48 a
CV (%)	19.7	18.0	23.0	22.6	26.2	10.67	8.5	7.7
p-value	0.594	0.161	0.412	0.308	0.084	0.839	0.168	0.849

Instituto de Florestas da Universidade Federal Rural do Rio de Janeiro Rodovia BR 465 Km 7, CEP 23897-000, Tel.: (21) 2682 0558 | (21) 3787-4033 - Seropédica - RJ - Brazil
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[1] *Alexandre Techy de Almeida GarrettDepartamento de Engenharia Florestal, Universidade Estadual do Centro-Oeste – UNICENTRO, BR 153, Km 7, Riozinho, CEP 84500-000, Irati, PR, Brasil e-mail: garrettflorestal@gmail.com