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<p>Monosporascus root rot and vine decline (MRRVD), caused by <i>Monosporascus cannonballus</i>, is a destructive soilborne disease threatening cucurbit production worldwide. However, effective integrated management strategies remain poorly defined. A two-year greenhouse study (2014/15 and 2015/16) was conducted to evaluate the individual and combined effects of organic amendments (0, 20, 40, and 60 t/ha), crop sequence, grafting, and soil solarization on MRRVD suppression and crop productivity. Agronomic parameters such as, yield, and fruit quality were monitored across two seasons, with a complementary pathogenicity assay characterizing virulence among 43 isolates. In the first season, high organic amendment significantly suppressed disease across all crops. For grafted melon, the 60 t/ha treatment reduced disease incidence by 42% and root damage by 63%, increasing yield by 355%. Squash using a treatment of 60 t/ha showed exceptional suppression, with ascospore densities declining by 32%. In the second season, integrating squash into rotation with grafted melon, combined with solarization and 60 t/ha amendment, achieved the most effective suppression, reducing ascospore densities by 60% and keeping disease incidence below 10%. This approach maximized grafted melon yield to 23.69&#xa0;kg/plant (848% increase) while maintaining superior fruit quality (9.36°Brix). The pathogenicity assay revealed a wide virulence spectrum; three highly virulent isolates caused complete root destruction, 100% disease incidence, and over 90% biomass reduction. The findings demonstrate that integrating high-rate organic amendment, strategic crop sequence, soil solarization, and resistant rootstocks provides sustainable MRRVD control. Future research should validate this integrated package under commercial field conditions and elucidate the soil microbial mechanisms driving disease suppression.</p>

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Sustainable integrated management of Monosporascus root rot in greenhouse-grown cucurbits

  • 期刊论文

  • 发表日期：

    2026年8月4日

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  • Abdelhak Rhouma,
  • Ibtissem Ben Salem,
  • Mahmoud M’Hamdi,
  • Naima Boughalleb-M’Hamdi

摘要

Monosporascus root rot and vine decline (MRRVD), caused by Monosporascus cannonballus, is a destructive soilborne disease threatening cucurbit production worldwide. However, effective integrated management strategies remain poorly defined. A two-year greenhouse study (2014/15 and 2015/16) was conducted to evaluate the individual and combined effects of organic amendments (0, 20, 40, and 60 t/ha), crop sequence, grafting, and soil solarization on MRRVD suppression and crop productivity. Agronomic parameters such as, yield, and fruit quality were monitored across two seasons, with a complementary pathogenicity assay characterizing virulence among 43 isolates. In the first season, high organic amendment significantly suppressed disease across all crops. For grafted melon, the 60 t/ha treatment reduced disease incidence by 42% and root damage by 63%, increasing yield by 355%. Squash using a treatment of 60 t/ha showed exceptional suppression, with ascospore densities declining by 32%. In the second season, integrating squash into rotation with grafted melon, combined with solarization and 60 t/ha amendment, achieved the most effective suppression, reducing ascospore densities by 60% and keeping disease incidence below 10%. This approach maximized grafted melon yield to 23.69 kg/plant (848% increase) while maintaining superior fruit quality (9.36°Brix). The pathogenicity assay revealed a wide virulence spectrum; three highly virulent isolates caused complete root destruction, 100% disease incidence, and over 90% biomass reduction. The findings demonstrate that integrating high-rate organic amendment, strategic crop sequence, soil solarization, and resistant rootstocks provides sustainable MRRVD control. Future research should validate this integrated package under commercial field conditions and elucidate the soil microbial mechanisms driving disease suppression.