Bragantia (2007) 66, 69-80

Rachel Benetti Queiroz-Voltan, Luciane Perosin Cabral, Osvaldo Paradela Filho and Luiz Carlos Fazuoli (2007)
Efeito da poda do tipo decote no controle da xylella fastidiosa em cultivares de cafeeiro
['Decote' type pruning effect upon xylella fastidiosa control in coffee cultivars]
Bragantia 66 (1), 69-80
Abstract: Xylella fastidiosa plant colonization causes damages to the coffee production and nowadays there is no available economic chemical control to this bacterium. Adequate cultivation management as the use of bacteria-free scions and control of the insect vector (cicadas), are practices that may attenuate the disease incidence. Pruning, that has been recommended for citrus and vines for disease control, still does not have its efficiency proved for coffee plants. This research work aimed to quantify the proportion of xylem vessel elements obstructed by the bacteria, as well as to evaluate the disease external symptoms severity after the 'decote' type pruning. In June 2003 (dry season), eight months after pruning, it was observed that 4% of the petiole vessel elements were obstructed by X. fastidiosa, 2% of the central vein and 1% of the stem. In the rainy season, 14 months after pruning, the obstruction proportion of vessel elements decreased to 2% in the petiole and to 1% in central vein and stem respectively. Therefore, the pruning practice decreased slightly the xylem vessel obstruction caused by the bacteria in the dry period, once prior to pruning a 6% obstruction in the petiole was observed. The new branches sprouted during the rainy season seemed to compensate obstruction in older branches, thus decreasing vase obstruction proportion. In 2003 there were no differences in the disease symptom severity among treatments in the two periods (dry and rainy season), however, in the dry period of 2004, 'Catuaí Vermelho IAC 81' and 'Mundo Novo IAC 515-20' cultivars, grafted on C. canephora 'Apoatã IAC 2258', presented higher severity and, again in the rainy period, differences were not observed. It was concluded that the 'decote' type pruning practice did not result in a X. fastidiosa efficient control.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Portuguese)
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Research topic(s) for pests/diseases/weeds:
population dynamics/ epidemiology

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Xylella fastidiosa	Coffee (Coffea)	Brazil (south)