The present study was conducted through two successive seasons of (2007-2009) at Fac. Agric. Exptl. Farm. Assiut Univ. to sur-vey Arthropods associated with three grapevine varieties (Mus-cat, Thompson seedless and Az-merly) and study the seasonal fluctuations of the most abundant and economically injurious pests: black vine thrips, Retithrips syri-acus Mayet and European red mite, Panoychus ulmi Koch.
Data of the survey study re-vealed the presence of 20 insect species belonging to 20 genera under 14 families of 8 orders. Moreover, mite species was rep-resented by three species belong-ing to three genera under two families of two orders. Intensive and extensive observations indi-cated that the collected insect and mite species can be classified according to their economic im-portance as pests included 19 insect species and two mite spe-cies. Predators included one in-sect species and one mite species.
In the first season (2007/2008) R. syriacus started with low levels in April, increased in May and the maximum number of individuals on leaves was recorded in June and July, for the three grapevine varieties. Then, the number of individuals decline rapidly during the next six months (Aug.-Jan.).
In the second season (2008/2009) the population den-sity of this insect species showed low level of multiplicity on Mus-cat and Thompson seedless dur-ing April and on Azmerly during June. The population increased through July and August to ex-hibit moderate monthly averages on the three varieties. A quick augmentation respecting the in-dividuals were recorded in Sep-tember on all grapevine varieties. Through November, December and January, the monthly aver-ages gradually decreased, and the pest completely disappeared in February on all the varieties tested.
On the other hand, population of P. ulmi was beginning at low level of abundance during April in the first season or March and April in the second one for the three grapevine varieties. Through May in the first season or May and June in the second one, the population density of this mite species reached its
utmost levels of abundance. Then, rapid descended in the level of population density was occurred through the next months, till disappeared in February in the first season and from September in the second one on the leaves of grapevine varieties.