Can Winged Aphid Abundance Be a Predictor of Cucurbit Aphid-Borne Yellows Virus Epidemics in Melon Crop?

• Published in: Viruses 2020-08, Vol.12 (9), p.911
• Main Authors: Schoeny, Alexandra, Rimbaud, Loup, Gognalons, Patrick, Girardot, Grégory, Millot, Pauline, Nozeran, Karine, Wipf-Scheibel, Catherine, Lecoq, Hervé
• Format: Article
• Language: English
• Subjects: Abundance; Animal biology; Animals; Aphidoidea; Aphids - physiology; Aphids - virology; Aphis gossypii; Biodiversity; Crops; Cucumis melo; cucurbit viruses; Cucurbitaceae - parasitology; Cucurbitaceae - virology; Datasets; disease progress curve; Epidemics; Experiments; Flowers & plants; insect trapping; Insect Vectors - physiology; Insect Vectors - virology; Insects; Invertebrate Zoology; Life Sciences; logistic model; Luteoviridae - genetics; Luteoviridae - physiology; Phytopathology and phytopharmacy; Plant Diseases - parasitology; Plant Diseases - statistics & numerical data; Plant Diseases - virology; Planting; Systematics, Phylogenetics and taxonomy; Vegetal Biology; Viruses; Yellows
• ISSN: 1999-4915; 1999-4915
• DOI: 10.3390/v12090911

Aphid-borne viruses are frequent yield-limiting pathogens in open field vegetable crops. In the absence of curative methods, virus control relies exclusively on measures limiting virus introduction and spread. The efficiency of control measures may greatly benefit from an accurate knowledge of epidemic drivers, in particular those linked with aphid vectors. Field experiments were conducted in southeastern France between 2010 and 2019 to investigate the relationship between the epidemics of cucurbit aphid-borne yellows virus (CABYV) and aphid vector abundance. Winged aphids visiting melon crops were sampled daily to assess the abundance of CABYV vectors ( , and ) and CABYV was monitored weekly by DAS-ELISA. Epidemic temporal progress curves were successfully described by logistic models. A systematic search for correlations was undertaken between virus variables including parameters µ (inflection point of the logistic curve) and γ (maximum incidence) and aphid variables computed by aggregating abundances on periods relative either to the planting date, or to the epidemic peak. The abundance of during the first two weeks after planting was found to be a good predictor of CABYV dynamics, suggesting that an early control of this aphid species could mitigate the onset and progress of CABYV epidemics in melon crops.