Friday, August 25, 2006

New Wilt Threatens Watermelon

It’s too bad that one of summer’s most enjoyed simple pleasures--the watermelon--can be such a bear to grow. Melon growers are beset by numerous problems related to disease, weather, pests and the quest for fruit uniformity.

But now, unfortunately, a new threat has emerged--one that may cause growers to wince even more.In separate studies, scientists with the Agricultural Research Service (ARS) in Lane, Okla., and at the University of Maryland (UM) in Salisbury have identified a new, more aggressive race of the fungus that causes Fusarium wilt in watermelon.

This disease is one that all melon farmers dread seeing. It can attack plants at any stage of growth, leaving young seedlings lifeless, or mature plants fruitless with nothing to show but shriveled and yellowing leaves.ARS scientists Benny Bruton and Wayne Fish, together with UM’s Xin-Gen Zhou and Kathryne Everts, discovered a new race of the fungus Fusarium oxysporum that causes Fusarium wilt.

Their findings were presented last week at the joint meeting of the American Phytopathology Society and Mycological Society of America, in Quebec City, Canada.Bruton and Fish, who work at the ARS South Central Agricultural Research Laboratory in Lane, found the new race, dubbed “Race 3,” while monitoring watermelon plants in fields near their Oklahoma laboratory. Bruton saw that a new, differently-acting fungus was plaguing plants thought to be resistant to Fusarium.

Three distinct races of Fusarium are known to cause wilt in melons. Plant breeders have developed watermelon varieties that can fend off Races 0 and 1 fairly well. And, luckily, Race 2--for which there are no resistant commercial cultivars--isn’t competitive in the soil environment.According to Bruton, the same is likely true for the new, more virulent Race 3. But he’s got a solution. He and colleagues have found that grafting watermelon onto sturdy squash or gourd rootstock is an effective way of controlling Fusarium wilt. Those rootstocks are resistance to the Fusarium races that attack watermelon.ARS is the U.S. Department of Agriculture’s chief scientific research agency.___________________________________________* This is one of the news reports that ARS Information distributes to subscribers on weekdays.* Start, stop or change an e-mail subscription at www.ars.usda.gov/is/pr/subscribe.htm* NewsService@ars.usda.gov www.ars.usda.gov/news* Phone (301) 504-1638 fax (301) 504-1486",0]
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Three distinct races of Fusarium are known to cause wilt in melons. Plant breeders have developed watermelon varieties that can fend off Races 0 and 1 fairly well. And, luckily, Race 2--for which there are no resistant commercial cultivars--isn’t competitive in the soil environment.According to Bruton, the same is likely true for the new, more virulent Race 3. But he’s got a solution. He and colleagues have found that grafting watermelon onto sturdy squash or gourd rootstock is an effective way of controlling Fusarium wilt. Those rootstocks are resistance to the Fusarium races that attack watermelon.

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AGRI-INFO/AUGUST 25, 2006


TITLE: NEW WILT THREATENS WATERMELON


ALAM BA NINYO NA NATUKLASAN NG MGA EKSPERTO ANG BAGONG FUSARIUM WILT NA NAGBIBIGAY PANGANIB SA KALIDAD NG WATERMELON O PAKWAN?

BATAY SA MGA MAGKAKAHIWALAY NA PAG-AARAL, NATUKLASAN NG MGA EKSPERTO NG AGRICULTURAL RESEARCH SERVICE SA LANE, OKLAHOMA AT NG UNIVERSITY OF MARYLAND SA SALISBURY, NATUKLASAN NILA ANG BAGO AT MAS AGRESIBONG LAHI NG FUNGUS NA SANHI NG FUSARIUM WILT.

ANG SAKIT NA ITO AY MAITUTURING NA ISA SA MATITINDING PROBLEMANG KINAKAHARAP NG MGA MAGSASAKA SA KAHIT NA ANONG STAGE NG PAGLAKI NG WATERMELON NA PUMAPATAY SA SEEDLINGS NG TANIM MAGING NG MATURE PLANTS AY NAGDUDULOT ITO NG KAWALAN NG BUNGA.

NATUKLASAN NINA ARS SCIENTISTS BENNY BRUTON AT WAYNE FISH KASAMA SI XIN-GEN ZHOU AT KATHRYNE EVERTS ANG BAGONG LAHI NG FUNGUS FUSARIUM OXYSPORUM NA SIYANG NAGIGING SANHI NG FUSARIUM WILT.

ANG BAGONG LAHI NG FUNGUS FUSARIUM AY BINANSAGAN NILANG RACE 3 NA NAKITA NILANG UMAATAKE SA MGA TANIM NA WATERMELON NA INAKALA NILANG MATIBAY LABAN SA FUSARIUM.

UNANG NAISAKATUPARAN NG MGA EKSPERTO ANG ILANG URI NG WATERMELON NA MATIBAY SA ATAKE NG FUSARIUM RACE 1 AT FUSARIUM RACE 2, NGUNIT BIGLANG LITAW NG FUSARIUM RACE 3.

NGUNIT, MAY NAKITANG SOLUSYON SI BRUTON PARA LABANAN ANG RACE 3 SA PAMAMAGITAN NG GRAFTING NG WATERMELON SA SQUACH O GOURD ROOTSTOCK MATAPOS NA SUMAILALIM NA RIN SA MASUSING PAG-AARAL.

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