Fitopatologia Brasileira (2003) 28, 136-141

Javier Toledo Barba, Erlei M. Reis and Carlos A. Forcelini (2003)
Efeito de solventes orgânicos usados como veículos de fungicidas no controle in vitro e in vivo da incidência e da transmissão de Bipolaris sorokiniana em sementes de cevada
[Effect of organic solvents used as vehicles for fungicides on the in vitro and in vivo control of incidence and transmission of Bipolaris sorokiniana in barley seeds]
Fitopatologia Brasileira 28 (2), 136-141
Abstract: An important pathogenic feature of the fungus Bipolaris sorokiniana is its capacity to be transmitted through barley (Hordeum vulgare) seeds, sometimes in levels up to 100%, which turns fungus eradication very difficult with the available fungicides. As an attempt to improve the control of the seed-borne fungus inoculum, two organic solvents (monoethyleneglycol - MEG and propyleneglycol - PPG, both at 0,5, 1, and 2%) were tested as vehicle for fungicides (iminoctadine, iprodione, triadimenol, triticonazol, flutriafol, and difenoconazol) used for seed dressing. In vitro fungus eradication was obtained with iminoctadine + MEG, iminoctadine + PPG (at 1 and 2%), and iprodione + PPG (2%). The organic solvents also improved the other fungicides efficacy, but they did not reach a 100% control. The in vivo (growth chamber adjusted to 25 ± 2 ºC and 80 - 95% RU) fungus transmission was 89,7% to coleoptiles and 12,3% to plumules. All fungicides reduced this process by more than 90% and the use of PPG did not improve fungicide performance significantly. Iminoctadine and difenoconazol completely inhibited the fungus transmission to coleoptiles. In conclusion, the positive in vitro effects of the organic solvents were not confirmed in vivo.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Portuguese)
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Research topic(s) for pests/diseases/weeds:
control - general
transmission/dispersal of plant diseases

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Bipolaris sorokiniana	Barley (Hordeum vulgare)