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1 February 2002 Influence of Plant Growth Stage on Grape Phylloxera (Homoptera: Phylloxeridae) Populations
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Abstract

To understand the effects of plant growth stage on the performance of grape phylloxera, Daktulosphaira vitifoliae (Fitch), demographic analyses were done using attached roots in a Vitis vinifera L. ‘Chardonnay’ vineyard during the vegetative, mid-ripening, and postharvest periods of grapevines. Survival of first instars was <30%. First instars coincide with the time of gall formation, and their survival was higher during postharvest than during the vegetative and mid-ripening periods. Survival after the second instar did not decrease with development but was stable, generally above 90% for the postharvest period and below 75% for the other experimental periods. Sucrose levels in root phloem parenchyma tissues were highest during postharvest compared with vegetative and mid-ripening periods and reflect a more rapid development during this period but only by a few days. The limiting step of grape phylloxera population growth appears to occur simultaneously with gall formation and is associated with survival. Survival and developmental rate of a virulent grape phylloxera strain were limiting with greenhouse vines of the resistant rootstocks 5C and SO4. Survival and developmental rates were more limiting for attached than detached roots.

Amir D. Omer, Jeffrey Granett, and M. Andrew Walker "Influence of Plant Growth Stage on Grape Phylloxera (Homoptera: Phylloxeridae) Populations," Environmental Entomology 31(1), (1 February 2002). https://doi.org/10.1603/0046-225X-31.1.120
Received: 8 March 2001; Accepted: 1 August 2001; Published: 1 February 2002
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