![gall dcinside board view gall dcinside board view](https://pbs.twimg.com/media/FEIsD-2acAADnTC.jpg)
Despite its easy diagnosis, it is common for symptoms caused by root-knot nematodes to be confused with physiological problems such as nutritional deficiency and hydric stress, or even with other pests and diseases ( Ritzinger and Ritzinger, 2002). enterolobii develop symptoms such as small and deformed leaves, accompanied by large amounts of galls on the roots that may lead to reduction of their productivity ( Castro et al., 2009 Castellano et al., 2011). mayaguensis) causing major damage to this crop ( Franco and Ponte, 1989 Holanda et al., 1997 Souza et al., 2006 Bueno et al., 2007 Dias-Arieira et al., 2010). Known commonly as root-knot nematodes, Meloidogyne species are obligate sedentary endoparasites that infect over 2000 plant species ( Sasser, 1980). emarginata, but due to their pathogenicity, Meloidogyne parasites are the most important. Many nematodes have been detected in association with M. There they induce dramatic changes in selected root vascular cells forming elaborate feeding cells to permanently supply nutrients that enable the nematodes to develop into reproductive adults ( Williamson and Gleason, 2003 Davis et al., 2008 Perry and Moens, 2011). Second-stage juvenile parasites penetrate the roots of host plants. Nematodes represent the largest source of biotic stress experienced by plants and can cause stunting, early senescence, and, in severe cases, total crop loss ( Bird, 2004 Perry and Moens, 2011). These and some other factors, such as nematode infections, limit the development of this crop ( Salla et al., 2002 Bueno et al., 2007 Moraes Filho et al., 2013). Orchards are often established by materials of unknown origin, resulting in poor uniformity of trees and fruits. emarginata available to Brazilian producers. The strong demand on the international market triggered an indiscriminate expansion of this crop throughout Brazil. This crop established itself as an agricultural crop of economic importance due to the high content of ascorbic acid found in its fruits, and its high industrial yield in the production of pulp ( Junqueira et al., 2002 Lima et al., 2003 Freire et al., 2008). Commonly known in Brazil as “Acerola”, the species was introduced to Brazil in the late 1950s, via seeds brought from the Antilles and the United States. Malpighia emarginata DC is a shrub found naturally in Central America including parts of Amazonia and the Caribbean islands. Accessions 027-CMF and 031-CMF were considered tolerant to the nematode and could be of great value in new breeding programs for resistance to M. The accessions showed different responses depending on host x pathogen interaction, from susceptibility to moderate tolerance. After 150 days, plants were evaluated for the following parameters: gall index, egg mass index, number of eggs per root system, number of eggs per gram of root, and reproduction factor. emarginata cuttings were inoculated with 10,000 eggs in a greenhouse.
![gall dcinside board view gall dcinside board view](https://live.staticflickr.com/2868/34017044125_6690959404_b.jpg)
The experiment was conducted adopting a completely randomized design in a factorial arrangement of 11 x 2 x 5, where M. emarginata genotypes from the active germplasm bank of Universidade Federal Rural de Pernambuco.
![gall dcinside board view gall dcinside board view](https://game.dalso.org/wp-content/uploads/2020/08/image-24-768x616.png)
![gall dcinside board view gall dcinside board view](https://content.any.run/tasks/c34acbb9-186d-4ecf-a4d5-06e4d91f1fa4/download/screens/188066c6-05ac-43ee-87b1-b288577eb63c/image.jpeg)
emarginata plants in Brazil, this study investigated M. Due to the scarcity of information about the severity of this parasite in M. The root-knot nematode Meloidogyne enterolobii has been described as a major threat to this crop, causing great production losses. Malpighia emarginata is cultivated in almost all Brazil and is considered an important agricultural crop.