No cure for loofah Fusarium wilt: Taichung Agricultural Research and Extension Station studies disease-resistant grafted seedlings

Summer is the main production season for luffa (sponge gourd), but because it is cultivated year after year, in recent years luffa has frequently been harmed by "soil Fusarium wilt fungus," causing yields to fall and plants to die. The Council of Agriculture's Taichung District Agricultural Research and Extension Station has developed a method of grafting the "cylindrical luffa" variety onto the "ridged luffa," which has resistance to Fusarium wilt, and it has demonstrated disease resistance in the field, effectively reducing the incidence of Fusarium wilt in luffa.

Fusarium wilt is severe, especially in old production areas with repeated cultivation

Assistant researcher Chien Chang-sheng of the Taichung District Agricultural Research and Extension Station said that Nantou is the largest luffa production area in the country, with planting area accounting for one quarter of all Taiwan, China. Among these, the luffa produced in the Tou-She living basin of Yuchi Township has good color, sweet and crisp flesh, and does not turn black after long cooking, giving it a strong reputation in the market. Over the past 10 years, the luffa cultivation area in the Tou-She area has expanded to 50 hectares, but total production has not increased noticeably. The main cause of reduced production is harm from soil Fusarium wilt fungus, which blocks the vascular tissue of luffa plants with fungal bodies, making water uptake difficult and leading to adverse effects such as reduced yields, shortened production periods and plant death.

The disease is especially prone to occurring in "old production areas," meaning long-term repeated cultivation without crop rotation, which causes the density of the pathogen to keep rising. In addition, there are no recommended pesticides for Fusarium wilt, causing farmers to suffer heavy losses.