if any body have work on the above topic kindly suggest some chemicals for better management.
Please try with thiram or copper fungicides such as copper hydroxide.
Chemical control of common scab in Brazil has been very erratic, since disease pressure is very dependent on many soil-dependent factors, such pH, moisture, organic matter, bacterium population and Streptomyces species, among others. Under high disease pressure, no chemical has been effective. By reducing disease pressure with crop rotation, irrigation and pH management and tolerant variety, you should test some systemic fungicide applied on top of planted tubers. I suggest you to check recent literature to look for modern fungicide molecules registered for use in potatoes.
Common scab ( or rather common scabs, as this is a disease complex in terms of symptoms and causal agents) is a soilborne bacterial syndrome of potato tubers, due to a range of Streptomyces species (S scabies, S. acidiscabies, S. reticuliscabies, S. europeaiscabies and possibly several others, depending on geographical locations and soil situations). Therefore, the only appropriate chemicals to control it would be either large-spectrum antimicrobials ( like maybe copper salts) or antibiotics. Antibiotics are forbidden for use in plant disease control in many countries, due to the risk of selecting resistant strains in the environment (and not just in the target species), and copper is problematic from a soil fertility and ecotox point of view. I don't think fungicides (except maybe very broad spectrum ones that are also active against bacteria) would provide any sort of control of common scabs
Therefore, the best solution is to grow resistant potato cultivars, and play with soil amendments to control pH and irrigation regimes, rather than attempt direct chemical control. There is quite a bit of literature avaialble on these cultural control methods.
Dear Mehi
There are some resistance sources against some of the species of Streptomyces. See for instance
Pasco C., Jouan B., Andrivon D., 2005. Resistance of potato genotypes to common and netted scab- causing species of Streptomyces. Plant Pathology 54: 383-392.
All the best
Didier
Dear Mehi
As a complement to previous answers, there are also now some candidate biocontrol agents (within the Streptomyces genus itself) that might provide some protection against common scabs. As their mode of action is probably linked to the production of antibiotics, this might be a sort of chemical control!
- Badges
- Science topic
- Similar topics
- Philosophy
- Moral Philosophy
- Free Will