The role of some systemic fungicides and resistance inducing chemicals on controlling pea downy mildew
2011
Abada, Kh.A. | Abdel-Malek, G.A.M.
The efficacy of some systemic fungicides and inducing resistance chemicals (IRCs) was evaluated, in vitro, on suppressing the germination of Peronospoa pisi sporangia (conidiospores) as well as managing downy mildew of pea under greenhouse and field conditions. The tested systemic fungicides, and the IRCs caused different inhibition degrees of Peronospora. pisi germinated sporangia. Spraying pea plants with the tested fungicides and IRCs under greenhouse conditions significantly reduced disease severity, with considerable increase to the assesed crop parameters compared with the control. Both the tested fungicides and IRCs caused considerable increase to the activity of oxidative - reductive enzymes, i.e peroxidase, polyphenoloxidase and ascorbic acid oxidase compared with the control. In addition, IRCs were more efficient in this respect than fungicides application. Under field conditions at Dakahlia governorate during 2008 / 2009 and 2009 /2010 growing seasons, spraying naturally infected mildewed pea plants with any of Folu Gold and Previcure-N fungicides as well as the IRCs Bion and Previcure-N, each alone or in alternation, resulted in a significant decrease of disease severity with significant increment of produced yield (green pods / plot compared with control treatment). On the other hand, the alternation between the tested fungicides and IRCs was more effective than spraying with the tested IRCs only.
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