Banca de DEFESA: JESSICA DANILA KRUGEL NUNES

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : JESSICA DANILA KRUGEL NUNES
DATA : 18/07/2019
HORA: 08:00
LOCAL: BR 364, km 5,5. Embrapa Rondônia - Sala de Video-Conferência Bloco A - Porto Velho
TÍTULO:

USE OF AQUEOUS EXTRACTS OF Tithonia diversifolia (Hemsl.) Gray and Vernonia condensata Baker NO CONTROL OF Meloidogyne incognita

PALAVRAS-CHAVES:

Root-knot; Control; plant extracts; coffee seedlings;

PÁGINAS: 65
GRANDE ÁREA: Outra
ÁREA: Ciências Ambientais
RESUMO:

The genus Meloidogyne is known to harbor phytohematoid species capable of causing great loss of agroeconomic point of view, since they have a wide range of hosts and high capacity of adaptation to the environment. Due to the difficulties encountered in conventional control methods, the use of extracts with nematicidal properties is a valuable alternative for small producers because it conciliates practical and economic value and causes less damage to the environment. The objective of the study was to test the use of the aqueous extracts of Tithonia diversifolia (Hemsl.) Gray and Vernonia condensata Baker as alternative control of Meloidogyne incognita. Held at the Brazilian Agricultural Research Company / Agroforestry Research Center of Rondônia-EMBRAPA, the work counted on two in vitro experiments. The first one tested the effect of the 12 "raw" extracts of the two plants, obtained from adaptations of the method of Ferris & Zeng (1999) on the hatching and mortality of juveniles of 2nd stage (J2). The results demonstrated levels of inhibition between 82% and 97% in the outbreak of J2 by the extracts, some of them differing statistically from the nematicidal control that showed 78% inhibition of hatching. Then, the tests were performed with the concentrations obtained by drying the 12 initial extracts and resuspending them in water, where the lowest effective concentrations of each extract were applied in the field test. Two in vivo experiments were conducted in a greenhouse, one with tomatoes from the cultivar Santa Cruz Kada and one with clones 750 from Coffea canephora (susceptible). Two concentrations of each extract were tested and the reproductive factor (RF) and number of galls / grams of root (NGGR) and root dry weight (PSR) and aerial part of the plants (PSPA) were evaluated. The results indicated that extracts made with fresh leaves of T. diversifolia (13.5 ppm) and extracts of the fresh stem (26.6 ppm) and dry leaf (15 ppm) of V. condensata had similar effects to Furadan® nematicide in relation to FR in tomato plants. Despite the reduction in the number of eggs, in relation to NGGR, the extracts did not show significant differences in comparison to the control water. The dry stem extract of V. condensata (2.4 ppm) had the best PSPA and PSR values. In view of the results obtained, the two plants demonstrate high potential for use as a control of M. incognita, however it demands new studies to determine the best method for its application.

MEMBROS DA BANCA:
Presidente - 079.807.827-80 - JOSE ROBERTO VIEIRA JUNIOR - UFV
Interno - 456.271.423-91 - CLEBERSON, DE FREITAS FERNANDES - UFC
Externo à Instituição - ROGÉRIO SEBASTIÃO CORRÊA DA COSTA - EMBRAPA