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Infestations of C. rusci occur on the foliage, stems and branches. This results in reduced vigour and general debility of the host plant. Heavy infestations may result in chlorotic spotting and premature shedding of leaves, wilting and dieback of stems. Honeydew deposited on the leaves and fruit serves as a medium for the growth of black sooty moulds. The sooty mould results in a reduction of photosynthetic area and lowers the market value of ornamental plants and produce.
Shabana and Ragab (1997) found Alternaria infectoria to be a promising biological control agent for C. rusci in Egypt. A. infectoria decreased egg hatching by 39.6% over a 15-day period compared to a control; crawlers hatching from fungus-treated eggs also became infected. Seventy-two per cent of the fungus-treated crawlers compared to 9% of the untreated controls entered the settling stage 6 days after exposure to the fungal inoculum. The highest level of nymphal mortality attributed to A. infectoria occurred when 30% inoculum was applied, and a high relative humidity was maintained for the following 48 hours.
Due to the variable regulations around (de-)registration of pesticides, we are for the moment not including any specific chemical control recommendations. For further information, we recommend you visit the following resources:
C. rusci is a pest of cultivated fig and citrus in the Mediterranean Basin and is occasionally a serious pest of citrus in Israel (Ben-Dov, 1988). It is a the main pest of fig trees in western Turkey (Onder and Soydanbay, 1984) and a pest of Actinidia in Italy (Pellizzari and Antonucci, 1982).