DEVELOPMENT OF YOUNG PLANTS OF CITRUS INOCULATED WITH Pratylenchus
jaehni (NEMATODA:PRATYLENCHIDAE) IN MICROPLOTS [DESENVOLVIMENTO DE
PLANTAS JOVENS DE CITROS INOCULADAS COM Pratylenchus jaehni (NEMATODA:PRATYLENCHIDAE)
EM MICROPARCELAS]. Calzavara, S.A.1; Santos, J.M.1;
Favoreto, L.1; Barbosa, J.C.2; & Borelli, E.R.1.
1Departament of Plant Health
(Nematology) UNESP/FCAV, Jaboticabal, São Paulo, Brazil: 2Departament
of Exact Science, UNESP/FCAV. E-mail: seradca@bol.com.br.
The root lesion nematode of citrus (Pratylenchus jaehni) was
described in 2001 based on a population collected in an orchard of sweet orange
in Itápolis County, São Paulo State, Brazil. In microplots under field
conditions, an experiment was carried out in order to study the influence of
the nematode inoculated in a logarithmic scale [0 (zero); 10; 100; 1,000; 10,000
and 100,000 specimens per microplot] on the development of young plants of
‘Valencia’ orange trees, grafted on ‘Rangpur’ lime. The experiment was established
in a randomized complete block design with 10 replicates. The following
variables were evaluated: height of the plant, stem diameter, diameter of the
second branch, canopy volume and the number of fruits per plant. After 12
months from the inoculation of P. Jaehni it were observed reductions of
22% in the height of the plants, 22.5% in the diameter of the stem, 20.4% in
the diameter of the second branch and 43.7% and 52.5% of the canopy volume at
11 and 12 months, respectively, after the inoculation. At 17, 21, 28, 34 and 39 months after
inoculation the plants showed significant reduction in all variables except
number of fruits that presented significant reduction only 34 months.
Keywords: Citrus, height of the plant, diameter of the stem, canopy
volume, the lesion citros nematodes.
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