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- Title
EXTRATO AQUOSO DE FOLHAS DE PINHEIRA NO MANEJO DA CASCA-PRETA-DO-INHAME.
- Authors
Magalhães, I. C. S.; Muniz, M. F. S.; Filho, G. Moura; Ramírez, C. H.; Araújo, A. S.; Soares, N. H. M.
- Abstract
Among diseases causing yield losses of yam in Brazil, the most important is dry rot caused by the plant-parasitic nematodes Scutellonema bradys, Pratylenchus coffeae and P. brachyurus. The aim of the present work was to evaluate the nematicidal effect of an aqueous extract of Annona squamosa leaves. Yam plants were inoculated 30 days after planting with a suspension of 1,000 specimens of S. bradys and P. coffeae. The experiments were performed twice under a completely randomized design, in a 5 x 2 + 2 factorial scheme, with seven replicates, using five concentrations of custard apple leaf extract (1.0; 2.0; 3.0; 4.0 and 5.0%), two application periods: 1) 30 days after inoculation; 2) 30 and 60 days after inoculation, plus the negative control (water) and the positive control (Benfuracarbe, Pottente®). Six months after planting, population densities of nematodes in soil and roots and the reproduction factor (final population/initial population) were evaluated. There was no significant difference for the periods of application of the extract in both experiments. There was a reduction in the nematode population densities in all treatments, especially at a concentration of 3%. The aqueous extract of A. squamosa leaves were nematicidal, and may be considered for the management of S. bradys and P. coffeae.
- Subjects
BRAZIL; SOIL nematodes; ANNONA; SOIL density; PRATYLENCHUS; POPULATION density
- Publication
Nematropica, 2020, Vol 50, Issue 2, p127
- ISSN
0099-5444
- Publication type
Article