AVRDC International Cooperators'
Found in North America, Europe, Asia, and Africa
Crops affected are mainly cucumber and cantaloupe, but also
squash and pumpkin to a limited extent. Watermelon is not
affected. Foliage wilts suddenly, frequently on a single runner
branch at first, followed by wilting of the entire plant. Wilt is
permanent. Bacteria are abundant in the vascular tissue and
exude in white droplets from vascular bundles on cut stems.
The viscous bacterial mass will "string-out" when the cut ends
of the stem are touched together.
Conditions for Development
The pathogen survives for extended periods in its cucumber
beetle vectors. The striped beetle, Acalymma sp., and the
spotted beetle, Diabrotica sp., transmit the pathogen.
Therefore, conditions conducive to the development of these
beetles favor the occurrence of the disease.
Rogue diseased plants to prevent secondary spread of the
pathogen. Control cucumber beetles with insecticides. Some
cultivars are more tolerant that others, if available they should
Stringing of bacterial
slime from the vascular
Striped cucumber beetle
Last updated: 2001.
Information from: Vegetable Diseases: A Practical Guide. Lowell L. Black, AVRDC.
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