EPIDEMIOLOGY OF THE CARROT MOTLEY DWARF VIRUS COMPLEX IN PARSLEY
P VERCRUYSSE1 , F MEERT1, P BLEYAERT2, L TIRRY3 and M HÖFTE1
1Laboratory of Phytopathology, and 3Laboratory of Agrozoology, University of Ghent, Belgium; 2POVLT, Beitem (Rumbeke), Belgium
Background and objectives /b>
Materials and methods
Using the extraction method, the presence of the aphid vector was investigated on other secondary hosts (umbelliferous weeds) surrounding the parsley fields.
Results and conclusions
The extraction method for aphids proved to be very efficient and could be performed within a short period of time. The parsley samples were representative for the whole plant. In the early planting, C. aegopodii was present in large numbers on the sampled parsley plants from the beginning of June. In the late planting of parsley, the population of C. aegopodii initially was smaller than in the early planting, but its development later in the growing season was analoguous. There was no correlation between the presence of C. aegopodii on the parsley plants and the appearence of CMD symptoms. The CMD symptoms developed later in the late planting, and the number of plants showing symptoms was considerably lower than in the early planting. Further tests are being done to determine the influence of environmental factors on CMD symptom development.
For the control of CMD, several insecticides are being evaluated in toxicity tests with the aphid vector and in field tests. Until the end of July, C. aegopodii was present on most sampled flowerheads of Anthriscus sylvestris and Aegopodium podagraria surrounding the parsley fields. Later in the growing season, Daucus carota subsp. carota was the most important umbelliferous weed that was infested with the CMD-vector.