CONTROL POSITIVO, CYSDV, 1 TUBO_2,5ML

Cucurbit yellow stunting disorder virus Cucurbit yellow stunting disorder virus (genus Crinivirus) was fi rst discovered in the United Arab Emirates (4). (genus Crinivirus) was first discovered in the United Arab Emirates (4). The disorder occurs mainly in areas where the whitefl y vector Bemisia tabaci Bemisia tabaci has been established, e.g., the has been established, e.g., the Arabic Peninsula, Eastern and Western Mediterranean basin, some African countries and North America. CYSDV causes serious damage to cucurbit crops with an approximated yield reduction of 30-50% (1, 4, 5).

Different species of cucurbits (i.e., melons, cucumber, squash and watermelon) are affected, but other hosts such as lettuce, alfalfa, bean and weed species are infected as well but remain symptomless (6). On cucurbits symptoms normally appear as bright yellowing of older leaves. CYSDV symptoms are often confused with nutrient defi ciency symptoms. The phloem-limited virus is neither seed nor mechanically transmitted, but is transmitted with infected propagation material (transplants). CYSDV is on the EPPO A-2 list (3).