Remedial measures
Cultural control
If there is any water logging in the field arrange for drainage.
Get rid of all weeds
Stop nitrogen fertilization or organic manuring until the disease is controlled.
Apply a top dressing of potash to enhance immunity.
Biological control
Profilactically use inoculants of the following
Trichoderma harzianum/viride
Ampelomyces quisqualis
Bacillus subtilis
Gliocladium catenulatum
Streptomyces lydicus
These are not very effective for curative purpose.
Organic certifiable control measures
Use any of the following
Copper oxychloride
Copper sulphate lime mixture
Chemical control
Effective chemical control agents include
Chlorothalonil
Propiconazole
Trifloxystrobin
Captan
Carbendazim
To be applied in recommended doses.
Biological
Use Mineral oil + soap emulsion or Neem oil based insecticides
Ues yellow sticky traps
Chemical
Apply dichlorovos, imidacloprid or synthetic pyrethroids
Thrips are tiny, slender insects with fringed wings. They feed by puncturing the epidermal (outer) layer of host tissue and sucking out the cell contents, which results in stippling, discolored flecking, or silvering of the leaf surface. Thrips feeding is usually accompanied by black varnishlike flecks of frass (excrement)
Picture (click on picture to magnify)