Attractive response of Meloidogyne javanica varies among non-host plants, while all of them reduce the nematode population when intercropped with host plants

The response of seven Poncirus trifoliata hybrid rootstocks tolerant to Huanglongbing (HLB) was evaluated for resistance against the citrus nematode (CN) Tylenchulus semipenetrans. HLB, caused by the bacterium Candidatus Liberibacter asiaticus, is one of the most destructive diseases of citrus and has become established in citrus production areas across the US. Trees affected by HLB decline faster when coinfected with soilborne pathogens. Thus, planting citrus rootstocks that can withstand multiple pathogens is the foundation of an IPM program in areas infested by HLB. The rootstocks that were screened for CN resistance were the best performing in Florida field trials under HLB pressure. The level of resistance of citrus hybrid rootstocks to T. semipenetrans was assessed in controlled conditions, by comparison to standard rootstocks with documented resistance (Swingle citrumelo) and susceptibility (Sour orange, Cleopatra mandarin) to CN. Typical symptoms caused by CN were reproduced on susceptible rootstocks (Sour orange, Cleopatra mandarin, Ridge, US-802, US-812, US-1283, US-1284) and included the characteristic development of dark root phenotype, a decreased root and shoot growth, and the appearance of leaf chlorosis. Three hybrid rootstocks (US-897, US-942 and US-1516) displayed CN resistance levels comparable to Swingle citrumelo and did not express any visible root and shoot symptoms. Our results showed that the resistance mechanism was not caused by chemotaxis but rather by restricting female penetration into the roots and impeding its ability to reproduce and form juveniles. These results provide valuable information to help citrus growers make educated decision about rootstock selection.

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Attractive response of Meloidogyne javanica varies among non-host plants, while all of them reduce the nematode population when intercropped with host plants

Cited by 4 publications

References 54 publications

Intercropping: ecosystem functioning and sustainable agriculture

Intercropping: ecosystem functioning and sustainable agriculture

A commercial formulation of Bacillus subtilis induces metabolomic changes in root exudates that invert the chemotactic responses of the nematode Meloidogyne incognita to host and non-host plants

Evaluation of Huanglongbing-Tolerant Citrus Hybrid Rootstocks for Resistance to Tylenchulus semipenetrans

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