Cucumber is plagued by numerous pests and diseases such as powdery mildew, CVYV, CYSDV, downy mildew (DM) and several others. Bal says they are indeed breeding for resistances to powdery mildew, CVYV and CYSDV. “Furthermore, we give a high priority to resistance to CGMMV, downy mildew, gummy stem blight and Fusarium.”
Aust indicates that in the southern parts of Europe and in the Czech Republic, ZYMV has developed, which is transmitted by vectors, mostly aphids.
“The biggest problems with ZYMV are caused in pumpkins and zucchini. However, smooth type cucumbers are the most vulnerable. They reduce the growth and yield of fruits,” he says. “That is why ZYMV resistance is important in addition to classical mould tolerance. For greenhouse cucumbers, due to the intensive growing in the shelters, it is necessary to monitor the whole set of resistance such as powdery mildew, ZYMV, CMV, CCu, CVYV, etc.”
For González-Cabezuelo, the basic resistance set of their varieties is powdery mildew, CVYV, and CYSDV. “However, depending on the varieties, CMV resistance is a must. On the other hand, we are working with other resistances such as CGMMV, ToLCNDV, downy mildew, etc. We are always attending to the field and plant health organisations in order to be prepared for the outbreak of any new disease,” he says.