Management
Aster yellows phytoplasma is a difficult pathogen to control. Currently there is no cure for Aster yellows. Infected plants and weeds should be removed to eliminate that source of the phytoplasma and minimize spread. Unfortunately, this is the only control method that home gardeners have available.
On an agricultural level, speaking specifically about carrots, some methods can be used to manage the leafhopper populations in an attempt to control AYP spread. The Aster Yellows Index (AYI) can be used to determine when to apply chemical controls. The AYI equals the percent of leafhopper population containing AYP multiplied by the number of leahoppers present per 100 sweeps. The resulting number can determine when to apply insecticides based on how susceptible the crop or cultivar is to leafhopper feeding. For highly susceptible crops or cultivars, an AYI of 50 indicates the need for application, while for intermediate crops or cultivars the AYI is 75 and for crops or cultivars relatively resistant to economically harmful symptoms the AYI is 100.
Read more about this topic: Aster Yellows
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