During the autumn, the aphids of roses appear in adult sexual forms (females and males) or sexupara forms (un-winged), sometimes in extremely high populations. The cause may be the weather neither too hot nor too cold. And the warmth days alternating with rainy and cold days, somehow determine a balance and climate conducive to population development and intensive feeding activity. Through this paper we set out to evaluate the populations of aphids that damage the rose plants during the autumn. Being a decorative plant, the rose also needs attention during periods other than those of spring and summer. The observations were made in a private garden in Timisoara in Lipovei area (Timis county) during 2 months (IX, X) of 2019. Four varieties of rose were analyzed, on which 4 readings were made (bi-weekly). In addition to aphids we have also followed other species associated with them such as ants or ladybugs. We found that on all the plants analyzed, aphids were present, sometimes even in excess populations (with overlapping individuals). Ants were also noted among the aphids. These were attracted by the liquid excrements of aphids which are known as honey dew. Where the number of aphids was high and the number of ants visiting the plants near the aphid-concentrated areas was increased. The population level of the 2 species involved (aphids and ants) varied depending on the variety of roses but also on the time of reading (periodic verification and the time interval of the day). High levels of aphids have been observed especially in red flowered varieties and thicker, softer petals, well caught by the bud. Compared to varieties with petals that fall slightly the population level was lower. In conclusion, aphids can create serious impairment of the decorative quality of roses in all flowering seasons, therefore it is necessary to check them periodically and to intervene to stop their propagation.

aphids, ants, population, assessing, autumn, rose plant

biology

Presentation: poster