O desenvolvimento de variedades resistentes constitui uma das principais alternativas para o manejo dos nematoides formadores de galhas em cana-de-açúcar. O presente trabalho teve como objetivo avaliar o desenvolvimento das variedades RB92579, RB863129, RB867515 e SP81-3250 em diferentes densidades de Meloidogyne incognita e M. enterolobii e o efeito dos genótipos sobre a reprodução dos nematoides, em condições de casa de vegetação. Plantas com um mês de cultivo tiveram o solo infestado com crescentes densidades de inóculo (0, 5000, 10000 e 20000 ovos e juvenis por planta) em delineamento inteiramente casualizado e foram avaliadas 90 dias após a infestação do solo quanto à reprodução do nematoide, peso da biomassa fresca da parte aérea e do sistema radicular, diâmetro do colmo, altura da planta e índice de galhas. As variedades RB863129, RB867515 e SP81-3250 foram resistentes ao parasitismo de M. enterolobii e a variedade RB92579, imune. Todas as variedades foram susceptíveis a M. incognita, embora as variedades RB863129 e RB 867515 se tenham destacado das demais, por apresentarem maior tolerância a esse nematoide.

Edaphic climatic conditions directly affect the population dynamics of nematode assemblages and management strategies. The objective of this study was to characterize spatiotemporal changes in nematode abundance and diversity in sugarcane fields of northeastern Brazil under different edaphic climatic conditions. Soil samples from seven geoenvironmental sites under continuous cultivation were taken at planting and 4, 9, and 14 months after planting. Nematode abundance and diversity varied with the soil's physical and chemical characteristics. Sites in the rainfed and irrigated coastal tables as well the floodplain had higher number of nematodes in contrast to the flat-land and hillside. The abundance of plant-parasitic nematodes increased concurrently with crop development, but the number of taxa decreased. Meloidogyne and Pratylenchus were the dominant plant-parasitic genera across locations, but bacterivores were dominant in southern sites at field replanting. Heat map delineated two distinct groups of nematode distribution within the geoenvironmental zones, rather than the sampling times. Pratylenchus density was high in both groups, but in contrast with Meloidogyne and Criconemella, the abundance of Pratylenchus and Helicotylenchus was higher in sites with lower soil bulk density and higher porosity, clay, organic matter, and water contents as those in the southern sites, reflecting edaphic climatic conditions.

The present study had as objective to evaluate methyl jasmonate and potassium silicate effect on Meloidogyne incognita parasitism in sugarcane (Saccharum sp.) variety RB863129 and peroxidase and  -1,3-glucanase activity elicited, under greenhouse. The effect of Methyl jasmonate and potassium silicate did not affect shoot biomass. Methyl jasmonate and potassium silicate significantly decreased eggs number Guimarães, L.M.P., Pedrosa, E.M.R., Coelho, R.S.B., Couto, E.F., Maranhão, S.R.V.L. & Chaves, A. Efficiency and enzymatic activity elicited by methyl jasmonate and potassium silicate on sugarcane under Meloidogyne incognita parasitism. Summa Phytopathologica, v.36, n.1, p.11-15, 2010.

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The effects of Coda Radimax (CR), Coda Humus-PK (CH) and Coda Vit (CV) on the induction of resistance for