Wednesday, March 22, 2006

Hebrs Fight Late Blight

Fine chefs may wince, but scientists with the Agricultural Research Service (ARS) are reaching into the cupboard and finding unconventional uses for such culinary classics as oregano and thyme, testing the herbs’ potency in a messy battle out on the farm.

ARS plant pathologist Modesto Olanya and colleagues are investigating plant essential oils--including oregano, thyme and lavender--and other biologically based approaches to control one of the most devastating potato diseases worldwide: late blight.

Potato plants infected with the fungal spoiler, called Phytophthora infestans, may be rapidly defoliated and destroyed.The fungal disease, blamed for the Irish potato famine of the 1840s, is a formidable disease to fend off.

It quickly gains resistance to widely used systemic fungicides, requiring researchers to constantly search for new ways to protect America’s favorite vegetable from the fungal threat.Olanya, who works at ARS’ New England Plant, Soil and Water Research Laboratory in Orono, Me., has found that among the essential oils, oregano is showing the greatest promise as a late blight suppressor.

In laboratory tests, the Maine researchers found that oregano and other essential oils greatly inhibited the growth of P. infestans fungi. However, oregano was less effective in suppressing late blight in growth chamber studies than in the laboratory.

If future studies continue to show promise, natural remedies such as essential oils could someday reduce a portion of the many fungicides used to prevent late blight from taking root in U.S. potato fields each year.

To increase their efficacy, Olanya is looking at pairing essential oils with other natural products, such as beneficial microorganisms.The essential oils do have some limitations to overcome.

According to Olanya, oregano is fairly volatile, meaning some of its fungi-fighting essence could evaporate from plant surfaces after it’s been applied. Conversely, the oils can burn plant leaves if applied too generously.

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AGRI-INFO/MARCH 22, 2006


TITLE: HERBS FIGHT LATE BLIGHT

ALAM BA NINYO NA NATUKLASAN NG MGA AGRI EXPERT NA ANG MGA HERB TULAD NG OREGANO AT THYME AY MAAARI NANG GAMITIN BILANG BIOCONTROL AGENT LABAN SA SAKIT NA UMAATAKE SA MGA TANIM TULAD NG PATATAS?

MATINDING PAGSUSURI ANG GINAGAWA NGAYON NI PATHOLOGIST MODESTO OLANYA AT MGA KASAMAHAN NITONG EKSPERTO SA PAKINABANG NG AGRIKULTURA MULA SA PLANT ESSENTIAL OILS NG OREGANO, THYME AT MAGING NG LAVENDER.

ITO AY PARA LABANAN ANG PESTENG SAKIT NG PATATAS - ANG LATE BLIGHT. ANG POTATO PLANTS NA INFECTED NG FUNGAL SPOILER NA TINAWAG NA PHYTOPHTHORA INFESTANS AY MABILIS ANG DEFOLIATION AT PAGKASIRA NITO.

ANG NATURANG FUNGAL DISEASE AY SIYANG SINISISI SA MATINDING GUTOM NA DINANAS NG MAMAMAYAN NG IRELAND NOONG 1840S.

MABILIS NA NAGKAROON NG RESISTANCE ANG NATURANG PESTE DAHIL NA RIN SA PAGGAMIT NG FUNGICIDES, NA SIYANG DAHILAN KUNG BAKIT NAPILITAN PO ANG MGA EKSPERTO NA MAGHANAP NG IBANG PARAAN PARA BIGYAN NG PROTEKTAHAN ANG MGA PANGUNAHING TANIM LABAN SA THREAT NG NATURANG FUNGI.

SA HANAY NG MGA SINURING MABUTI NG MGA EKSPERTO, ANG OREGANO ANG SIYANG NAGPAPAKITA NG INDIKASYON NA MAAARING MAGING LATE BLIGHT SUPPRESSOR.

SA MGA LABORATORY TEST, NATUKLASAN NA ANG OREGANO AT IBA PANG ESSENTIAL OILS AY MAY KAKAYANAN NA PIGILIN ANG PAGLAKI NG INFESTANS FUNGI, GAYUNMAN ANG OREGANO AY NAKITANG LESS EFFECTIVE SA SUPPRESSION NGLATE BLIGHT SA GROWTH CHAMBER STUDIES KESA SA LABORATORYO.

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