In the current context of climate change in the Alentejo region, the green leafhopper (or cicada) represents one of the biggest challenges in terms of pests faced by wine producers, with a significant impact on production. It was against this backdrop that a team from InnovPlantProtect (InPP) designed and carried out the experimental trial “Monitoring and Diagnosis of Green Leafhopper Infestations in Vineyards of theJoão Portugal Ramos”, work on which began in May 2021, on the Vila Santa estate in Estremoz.
The green leafhopper (species Jacobiasca lybicand Empoascaspp.), in this case, is a pest that sucks the leaves of the vine, altering their color and shape. The leaves lose their ability to photosynthesize, darken and, in the most serious cases, fall off. The grapes lose quality and quantity. The vineyard can also be weakened in the post-harvest period.
The main objectives of this trial, led by Pest and Disease Monitoring and Diagnosis Department of the InPP, were to characterize the damage caused by leafhoppers and to obtain information on the demographic parameters of these insects, which will serve as a basis for using remote sensing to predict the time and space of the pest's occurrence.
In the first phase, traps were placed in 14 locations, in collaboration between technicians from João Portugal Ramos and the InPP. These traps were monitored weekly between May and August by an InPP team to count adult individuals of the green leafhopper. In June, field work intensified, with surveys being carried out to detect vines infested by green leafhoppers.
The surveys ran until the end of July and 58 vines were selected and marked for weekly monitoring. The selected vines were monitored between June and August, and the number of nymphs was counted, the instar of the nymphs observed (stage of metamorphosis between two moulting periods), as well as recording the severity of the symptoms observed.
All the information obtained was recorded using the app ODK Collect for Android, being immediately accessible through a WebGIS platform created with the software open sourceQGIS/Lizmap. Other tasks carried out included collecting specimens for identification in the laboratory and prospecting for the pest in potential natural hosts during the winter period.
InPP will soon be presenting some of the results of this trial, and the R&D plan for 2022 is currently being prepared.
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