Monday, December 10, 2007 - 10:29 AM

Seasonal sampling, cultivar susceptibility and effects of compost tea on grape phylloxera, Daktulosphaira vitifoliae (Fitch), in the Ozarks

Sandra Sleezer,, Donn T. Johnson,, and Barbara Lewis, University of Arkansas, Entomology, AGRI 319, Fayetteville, AR

Grape phylloxera is native to the southeastern United States but most published studies have been conducted in California or other parts of the world where it was introduced. This pest can cause crop reduction due to root and foliar feeding, but more importantly cause vine death through secondary fungal pathogens entering root-feeding wounds. Recently, growers in the Ozark region have planted European and hybrid grape cultivars that are susceptible to grape phylloxera. Of the two objectives the first was to describe the life cycle,dispersal, and overwintering sites of the grape phylloxera. The second was to determine the effects of high fungal biomass compost tea on suppressing grape phylloxera and grape root pathogenic fungi. Weekly counts of phylloxera crawlers were made from sticky tape traps placed on canes and trunk, soil emergence sticky traps, and aerial sticky traps. By knowing the relative susceptibility of cultivars to root phylloxera we can better determine the need for using a rootstock or other management technique. Compost tea was added to the soil of potted grape vines to observe the effects on root fungal pathogens and root phylloxera. New control tactics are sought after to minimize root phylloxera populations and/or prevent root pathogenic fungi to allow vines to be grown on their own roots.

Species 1: Hemiptera Phylloxeridae Daktulosphaira vitifoliae (grape phylloxera)