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Search History * #1 Phylloxera quercus (3 records)

Record 1 of 3 in CAB Abstracts 1987-1989
TI: Individual variation in the phenology of oak trees and its consequences for herbivorous insects.
AU: Crawley-MJ; Akhteruzzaman-M
SO: Functional-Ecology. 1988, 2: 3, 409-415; 14 ref.
LA: English
AB: The growth, fecundity and herbivore communities of 36 oak trees (Quercus robur)
SO:were studied between 1981 and 1988 in the UK, as part of a long-term study on the impact of insect herbivory on tree recruitment. Using 6 phenological categories, it was possible to assign a unique phenological rank to each tree in each year. Trees had consistent phenological ranks from year to year. The same trees were the first into leaf, and the first to shed their leaves in the autumn. Contrary to conventional wisdom, early-flushing trees did not suffer significantly higher levels of defoliation, but the same trees were consistently the most heavily defoliated. The date of bud burst in spring varied by as much as 3 weeks but the time difference between the earliest and latest individuals was almost constant. Individuals with different phenology supported significantly different herbivore faunas, both in species composition and in relative abundance. The micropterygid Eriocrania subpurpurella was more abundant on early-flushing individuals, while Phylloxera quercus and the cynipids Neuroterus quercusbaccarum and N. numismalis were more abundant on late-flushing trees. The degree of variation between individual plants exhibited in this study was high and it is suggested that this emphasizes the need for large sample sizes.
PT: Journal-article
AN: 881117149

Record 2 of 3 in CAB Abstracts 1984-1986
TI: Ecological studies on acorn aphid, Phylloxera quercus Boyer (Phylloxeridae, Homoptera).
AU: Mohammad-MA; Abdulla-AA
SO: Iraqi-Journal-of-Agricultural-Sciences-"Zanco". 1985, 3: 1, 69-76; 3 ref.
LA: English
LS: Arabic
AB: Phylloxera quercus is one of the important pests of oaks [Quercus] in the Salah Al-Deen region of Iraq, infesting the seeds and causing heavy losses of acorns. In 1979 and 1980, the aphid reached its maximum numbers during the last fortnight of October. Temperature had a significant positive effect on aphid activity, and relative humidity had a negative effect that did not reach statistical significance. Predators associated with the aphid were Chrysopa carnea [Chrysoperla carnea], Metasyrphus corollae, Coccinella septempunctata, Scymnus marginicollis and S. biverrucatus [Nephus bipunctatus]. There was a significant positive correlation between the numbers of predators and prey.
PT: Journal-article
AN: 850526373

Record 3 of 3 in CAB Abstracts 1976-1978
TI: Flavonoids as a factor of resistance of some Oak species to Oak leaf Phylloxera.
AU: Petrova-VP; Berezovskaya-NM
SO: Zhurnal-Obshchei-Biologii. 1974, 35: 798-803.
LA: Russian
LS: English
AB: Considerable amounts of flavonols, and slightly smaller amounts of catechins and leucoanthocyanins were found in the leaves of Oaks. Flavonol concentration declined during the development of P. [quercus]. Results indicate an inverse correlation between the susceptibility of Quercus species to Phylloxera and the contents of phenol derivatives in their foliage.
PT: Journal-article CI: Berichte Biochemie und Biologie (1976) 426, 11034. De. BLL.
AN: 760633414