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Biological control of damping-off of sugar beet by Pseudomonas putida applied to seed pellets
Journal article   Peer reviewed

Biological control of damping-off of sugar beet by Pseudomonas putida applied to seed pellets

D A Shah-Smith and Richard G Burns
Plant Pathology, Vol.45(3), pp.572-582
1996
DOI: https://doi.org/10.1046/j.1365-3059.1996.d01-156.x
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https://doi.org/10.1046/j.1365-3059.1996.d01-156.xView
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Abstract

biological control damping-off Beta vulgaris Chenopodioideae Pseudomonas putida Pythium Pythium ultimum
Pseudomonas putida 40RNF applied to seed pellets reduced the occurrence of Pythium damping-off of sugar beet. A density of 6 × 107 40RNF per pellet reduced Pythium damping-off from 70 to 26% when seeds were sown in artificially infested soil (250 propagules Pythium ultimum per g dry soil). The efficacy of 40RNF was dependent on its density in the seed pellet (in the range 2 × 104-6 × 108 per pellet) and on the number of propagules of Pythium in soil. 40RNF declined to or stabilized at approximately 1 × 106 per pellet 3 days after planting, and this was independent of the inoculum density. This indicated that the crucial steps resulting in damping-off of sugar beet caused by Pythium ultimum must occur within 3-4 days of sowing. 40RNF reduced pericarp colonization by P. ultimum by 43% 48 h after planting and caused a 68% decrease in the number of sporangia of P. ultimum in the surrounding soil (0.0-5.0mm). P. putida 40RNF also reduced pre and post-emergence damping-off (from 69.5 to 37.5%) caused by indigenous populations of Pythium species in an infested soil and this was as effective as the fungicide hymexazol (69.5 to 40%).

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