Summary Cryphonectria parasitica, the causal agent of chestnut blight, has been responsible for the decline in chestnut in Portugal for the last two decades. In order to improve understanding of C. parasitica diversity, a total of 617 isolates from all affected chestnut‐growing areas in continental Portugal, Madeira and the Azores archipelagos were studied. Nine vegetative compatibility (vc) types were identified among the isolates. EU‐11 was the most widespread vc type comprising 80.2% of the isolates, followed by EU‐12 (7.1%) and EU‐66 (6.6%). Two of the Portuguese vc types could not be assigned to a known European vc type. The diversity of vc types was low in the Portuguese populations of C. parasitica, but comparable with other areas where C. parasitica was introduced recently. The frequent occurrence of perithecia and both mating types of C. parasitica indicates that sexual reproduction of the chestnut blight fungus is common in Portugal. One C. parasitica isolate from Trás‐os‐Montes showed a white culture morphology and contained dsRNA, indicating the presence of hypovirulence in this area.

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ABSTRACT:The objective of this work was to evaluate the influence of irrigation system and soil cover on yield of yellow melon in Petrolina / PE. The experiment was carried out in the period from April 09, 2016 to June 8, 2016 and was conducted at the Petrolina campus in the IF Sertão -PE rural area, with a randomized complete block design, 2 x 2 x 3 plot scheme, (One and two lines of drippers per row of plants), and the subsubparcels, three soil cover (black mulching cover), two plots of hybrids (Gladial and 10/00), subplots, two irrigation systems, Cover with mulching grey and without soil cover) and six replicates. Mulching efficiency (MPP) was studied in the soil cover and irrigation system located with drippers for the production of yellow hybrid melon 10/00 and Gladial under field conditions. It was verified the statistical influence of the soil cover on melon productivity.