The Plant Pathology Journal (2008) 24, 171-177

A.M. Kamal Abo-Elyousr, M.A. Mohamed Hussein, A.D. Aly Allam and A.H. Mohamed Hassan (2008)
Enhanced onion resistance against Stemphylium leaf blight disease, caused by Stemphylium vesicarium, by di-potassium phosphate and benzothiadiazole treatments
The Plant Pathology Journal 24 (2), 171-177
Abstract: In this study, we investigated the induced defense response and protective effects against Stemphylium vesicarium by application of benzothiadiazole (Bion®) and di-potassium phosphate salt (K₂HPO₄) to onion. Onion leaves were sprayed with Bion® and K₂HPO₄, then inoculated 2 days later with a virulent strain of S. vesicarium under greenhouse conditions. Disease severity and activities of peroxidase (PO), polyphenoloxidase, phenylalanine ammonia-lyase (PAL) and phenol contents were evaluated in the treated leaf tissues. Reduction in the disease severity was observed in plants treated with Bion® and K₂HPO₄. Onion plants treated with Bion® and K₂HPO₄ and inoculated with the pathogen showed significantly higher PAL activity, PO activity, and phenol contents than inoculated water-treated plants 2 days after the treatment. In conclusion, the results of this study provide evidence that application of simple non-toxic chemical solutions as di-potassium phosphate and Bion® can control Stemphylium leaf blight of onion.
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Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host
control - general

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Stemphylium vesicarium	Onion/garlic/leek (Allium)	Egypt