The fungal species Monosporascus cannonballus and M. eutypoides have been described as the causal agents of Monosporascus root rot and vine decline disease (MRRVD), which mainly affects melon and watermelon crops. Resistance to M. cannonballus has been reported in some melon cultivars (ssp. melo). Moreover, melon ssp. agrestis accessions have proven to be better resistance sources. This is the case of the Korean accession ‘Pat 81’, highly resistant under field and artificial inoculation. The objective of the work here presented was the evaluation of the resistance to MRRVD of different accessions representing the variability of Cucumis melo ssp. agrestis, against both, M. cannonballus and M. eutypoides, in a multiyear assay under different infection conditions. In general, M. eutypoides was less aggressive than M. cannonballus in the different environmental conditions. There was a strong influence of temperature on MRRVD, with more severe symptoms with higher temperatures and with variable effect of infection on plant development depending on the fungal species considered. Resistance to MRRVD has been confirmed in ‘Pat 81’ and in its derived F1 with a susceptible Piel de Sapo melon. Among the new germplasm explored, African accessions (both wild agrestis and exotic cultivated acidulus) showed good performance in artificial inoculation assays and in field conditions. These sources do not present compatibility problems with commercial melons, so they can be introduced in backcrossing programs. The accession assayed of the wild relative Cucumis metuliferus, also resistant to Fusarium wilt and to root‐knot nematode, was highly resistant to MRRVD. The interest of this accession mainly relies in its advantages as a rootstock for melon.

中文翻译：

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甜瓜对大孢单孢菌和真核分支杆菌的抗性：与单孢菌根腐烂和藤蔓下降有关的真菌病原体

真菌物种Canonballus和M .。阿片肽被认为是单孢菌根腐病和葡萄藤枯萎病（MRRVD）的病原体，主要影响瓜类和西瓜作物。对M的抗性。cannonballus据报道，在一些甜瓜品种（亚种甜瓜）。而且，瓜子。事实证明，agrestis品种是更好的抗药性来源。韩国登录号“ Pat 81”就是这种情况，在田间和人工接种下具有很高的抗性。此处介绍的工作目的是评估不同种质对黄瓜枯萎病的抗MRRVD的能力，ssp。Agrestis对M都反对。cannonballus和中号。拟肽，在不同感染条件下的多年试验中。通常，M。杜仲比M小。炮弹在不同的环境条件下。温度对MRRVD有强烈影响，温度升高会导致更严重的症状，取决于所考虑的真菌种类，感染对植物发育的影响也不同。已在“ Pat 81”及其衍生的F1中用易感的Piel de Sapo甜瓜证实了对MRRVD的抗性。在新的种质资源研究，非洲种质（野生川谷和异国情调的耕地acidulus）在人工接种试验，并在现场条件下表现出良好的性能。这些来源不存在与商业甜瓜的兼容性问题，因此可以在回交程序中引入它们。野生亲缘黄瓜的分析对镰刀菌枯萎病和根结线虫也有抵抗力，对MRRVD具有高度抵抗力。该种的兴趣主要在于其作为甜瓜的砧木的优势。