Spread of zucchini yellow mosaic potyvirus in squash in Hungary

The temporal and spatial distribution of zucchini yellow mosaic polyvirus ( ZYMV) was studied in a 3000-m(2) zucchini squash field. The first infected plants H ere found 4 weeks after the held was exposed to virus source plant s. The infection increased to nearly 74% by the end of the study.. Alate ap hids were active from the beginning of the study and 43 species were trappe d in the field. Flights of vector species Acyrthosiphon pisum and Myzus per sicae peaked during the fourth week which resulted in high virus incidence 4 weeks later. There was 3 significant correlation between the number of ve ctors caught in yellow pan traps and the number of infected plants in the f ield. In laboratory studies evaluating 11 aphid species, Aphis pomi de Geer was: identified as a new vector species of ZYMV. Although this aphid was n ot caught in our field studies, it may be an important contributor in other areas where cucurbits are grown in close proximity to apple or other hosts of this aphid.