Abstract
ABSTRACT: Root-knot nematode is one of the most important phytosanitary problems for Conilon coffee, as it reduces productivity and is difficult to handle. We aimed at studying the infectivity and damage caused by M. incognita race 1 in the “Jequitibá Incaper 8122” intermediate maturity coffee variety. The experiment was conducted in a greenhouse, in completely randomized design, with five replicates. The clones composing the variety “Jequitibá Incaper 8122” were inoculated with 2,000 eggs + second-stage juveniles of M. incognita race 1. Uninoculated plants were the control. Evaluations were performed 180 days after inoculation, considering the plant height (H), stem diameter (SD), number of leaves (NOL), leaf area (LA), number of plagiotropic branches (NPB), number of nodes (NN), chlorophyll content (CHLO), shoot dry matter (SDM), root fresh matter (RFM), final population (FNP), and reproduction factor (NRF). The nematode reduced NOL in clones 208 and 209, NRF in clones 201, 203, 207 and 208, NN in clones 203, 207, 208 and 209, CHLO in clones 201, 204, 206, 207 and 209, SDM in clones 201, 203, 204 and 205 and RFM in clones 205 and 207. M. incognita race 1 FNP and NRF were larger in clones 208, 201, 207 and 203. Clone 202 had FNP and NRF equal to zero, being immune to the nematode. Clone 206 presented the lowest NRF value among clones parasitized by M. incognita.
Highlights
Brazil is the world’s largest producer and exporter of coffee (MAPA, 2017)
We aimed to evaluate the infectivity and to quantify the damage caused by M. incognita race 1 to the nine intermediate maturity clones of Conilon coffee variety “Jequitibá Incaper 8122”
There was no effect of the nematode on H, stem diameter (SD), and leaf area (LA)
Summary
The state of Espírito Santo is the first in the ranking of Conilon coffee production The demand and consumption of these types of industrialized coffee have been increasing worldwide (KALSCHNE et al, 2018). The Conilon coffee variety “Jequitibá Incaper 8122” consists of nine clones and was developed in the state of Espírito Santo by the Instituto Capixaba de Assistência Técnica e Extensão Rural (Incaper) (DOPES, 2013; FERRÃO et al, 2015). The use of these varieties has helped the state production to increase 300% in the last 20 years (FERRÃO et al, 2013)
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