Biocontrol Science and Technology (1997) 7, 415-422

E.M. Bauske, P.A. Backman, K.M. Harper, P.M. Brannen, R. Rodriguez-Kabana and J.W. Kloepper (1997)
Effect of botanical aromatic compounds and seed-surface pH on growth and colonization of cotton plant growth-promoting rhizobacteria
Biocontrol Science and Technology 7 (3), 415-422
Abstract: Citral (3, 7-dimethyl-2, 6-octadienal), furfural (2-furaldehyde) and benzaldehyde (benzoic aldehyde) previously demonstrated control activity against Meloidogyne incognita and fungal diseases on cotton. Plant growth-promoting rhizobacteria (PGPR) applied to cotton were previously found to promote plant growth and reduce seedling disease. Studies were under taken to determine if these compounds were compatible with PGPR. In tests with 12 PGPR strains, vapor of citral inhibited in vitro growth of most strains, and vapor of furfural and benzaldehyde, with one exception, killed all but the Bacillus spp . tested. When 0.35 ml kg^-1 soil of each compound were applied to the soil 9-10 days prior to planting the cotton cultivar Deltapine 51, only furfural significantly reduced rhizosphere colonization across all strains from 4.70 colony-forming units (CFUs)/g of root to 4.42 CFUs/g root. In greenhouse studies, the low seed-surface pH (2.3) of commercial seed did not reduce root colonization, compared with colonization on roots from seed at pH 5.4. There were no synergistic interactions between seed-surface pH and any of the compounds. Although previous research indicated that application of both furfural and benzaldehyde increased the proportion of Burkholderia spp. in the soil, there is no indication that they increased cotton root colonization by the B. cepacia strain tested. These results indicate PGPR can be combined with citral and benzaldehyde in integrated management systems and that the low seed-surface pH of acid-delinted cotton will not limit their application.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Phillip M. Brannen, Paul A. Backman

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
control - general
Research topic(s) for beneficials or antagonists:
resistance to pesticides

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Meloidogyne incognita	Cotton (Gossypium)
Burkholderia cepacia (antagonist)