Cedusa vulgaris (Fitch)
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publication ID |
https://doi.org/10.26515/rzsi/v125/i2/2025/172835 |
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persistent identifier |
https://treatment.plazi.org/id/03F38792-FFC9-FFF6-FF2A-0464FC75F941 |
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treatment provided by |
Felipe |
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scientific name |
Cedusa vulgaris (Fitch) |
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Adults of Cedusa vulgaris (Fitch) View in CoL
Material examined: India; 1 ♂ ; 2♀; CVB 1♂; 2♀
Geolocation - Grapes block of Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir, Shalimar (34˚’46.6”N; 74˚ 52› 47.2»E), Srinagar, Kashmir.
Diagnostic characters of Cedusa vulgaris : Adults: Mediumsized, approximately 4 to 6 mm, light to dark blue coloured, covered with white patches, red coloured eyes are distinctly visible ( Fig. 1 View Fig ). (a) Head and pronotum: A low, broadly rounded longitudinal carina on the frons is quite distinct, and the head and pronotum typically lack pale colouration ( Fig. 3 View Fig ). The head has no more than raised margins on the frons, while the antennae and antennal troughs are pale in colour. Terminal segments of the beak are short, subequal in length ( Fig. 4A, B View Fig ). (b) Legs: Pale yellow to orange-coloured legs; second segment of hind tarsi with row of apical spines ( Fig. 4A View Fig ). (c) Abdomen: Red to orange patches are present on the ventral side. (d). Wings: Both fore and hindwings are dark to pale brown; many forms are fragile with wings greatly surpassing the end of the abdomen; often with pustules along the claval vein of the wing; the apex of the claval vein (A2) touches the wing margin, indicating a close connection to the outer edge. Additionally, the branches of the stem MA form an anterior comb, contributing to the overall venation pattern. (e) Phallus and paramere: Males with parameres exceeding abdomen in ventral view; apical hook of male clasper is rather long, slender and moderately curved anteriorly ( Fig. 4C View Fig ).
Symptoms: Adults suck sap from leaves from both adaxial and abaxial surfaces. Distinct white patches of discolouration due to loss of sap can be noticed ( Fig. 2 View Fig ), loss of sap in leaves may reduce their photosynthetic efficiency and reduce the movement of essential elements, which makes leaves gradually wilt when the population reaches alarming levels. This is the first instance of Cedusa hoppers seen feeding on leaves of grapes with fewer populations. Only feeding symptoms were seen. For establishing the possibility of economic loss or severe damage, further observations are required. Rows of vines where adults were seen, also exhibited some viral infection symptoms such as vein clearing, curling and distortions. Since many leafhoppers and other sucking pests were already known to transmit viral diseases to grapes ( Harish and Cherian, 2024). We only suspect that Cedusa could be a potential vector of viral or phytoplasma diseases, which has to be confirmed through further studies.
Seasonality: Mostly observed in June, when the bunches were developing, these hoppers were seen sucking saps which pose a little obstruction in regular growth and development. The population was high during the last week of June and started gradually decreasing from the last week of July to mid-August.
Distribution and host plants: The genus Cedusa is known to be spread over South America, North America, Europe, Africa and Australia. Few reports in Asia were also found, sparsely, with less information. There is no report of this planthopper from the Indo-Malayan region. A list of host plants associated with adults is given in Table 3. Mostly, nymphs are found to feed on fungal hyphae, hosts of adults of many species are not known ( Wilson et al., 2015). This is the first ever report of the genus infesting grapes.
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