Worst case is a virus disease like asters yellows or beet mosaic.
2.
Genetically, the pathogen was indistinguishable from the agent of aster yellows.
3.
Aster yellows does not typically kill perennial host plants.
4.
The aster yellows index ( AYI ) can be used to determine when to apply chemical controls.
5.
It is the vector of aster yellows disease, which affects various vegetable plants, weeds and ornamental plants.
6.
This means that hot and dry conditions are less conducive to the spread of aster yellows than times of abundant rainfall.
7.
The vector leafhopper feeds on the phloem of aster yellows-infected plants by inserting its straw-like mouthpart, a stylet, into the cell and extracting it.
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