What is Stemphylium blight disease in onion crops?

What is Stemphylium blight disease in onion crops
  • Small yellowish to orange spots or streaks are seen in the middle of the leaves. 

  • In later stages, elongated spindle-shaped spots surrounded by pinkish margins develop in the middle of leaves.  

  • The disease appearing on the inflorescence stalk causes severe damage to the seed crop.

  • At the interval of 10-15 days after transplanting or if symptoms of the disease appear, use fungicides such as spray THIOPHANATE METHYL 70% W/W  @ 300 gram / acre or CARBENDAZIM 12% + MANCOZEB 63%WP @ 300 gram / acre.

  • HEXACONAZOLE 5% SC@ 400 ml/ acre or TEBUCONAZOLE 10% + SULPHUR(S) 65% WG  @ 500 gram / acre.

  • Spray CHLOROTHALONIL 75% WP  @ 400 gram / acre or KASUGAMYCIN 5% + COPPER OXYCHLORIDE 45% WP @ 300 gram/acre.

  • As a biological treatment, use PSEUDOMONAS FLUORESCENS  @ 250 gram / acre or TRICHODERMA VIRIDE   @ 500 gram / acre.

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