دراسة حياتية و بيئية حقلية عن حشرة خنفساء قلف أشجار الفستق الحلبي Hylesinus vestitus M. and R. (Coleoptera : Scolytidae)‎ في سورية

Abstract EN

In Syria, pistachio (Pistacia vera L.) trees are often heavily infested by the pistachio bark beetle Hylesinus vestitus M.&R..

Field studies were earned out in Morek region, Hama/Syria, in 1995-1996 on the biology and ecology of H.

vestitus.

The pest had two overlapping generations per year, and all adults aestivated About 30% of the adults hibernated in the new branches, while ca.

70% of them as well as all old larvae hibernated in the old branches.

Adults were present all year round, while none of the immature stages occured during summer.

Immature stages were found only in galleries in the old stems during the other seasons.

The periods of occurrence of the different stages under field conditions were approximated.

Distribution and intensity of beetles was also determined.

Beetles were attracted to dead or unhealthy trees, and infestation decreased with increase of distance from field borders.

Adults preferred the upper parts of the new branches, particulary at the southern and eastern parts of the trees.

The effect of climatic factors on the seasonal abundance of adults significantly increased with increase of temperature, and decreased with increase of both relative humidity and rainfall.

Insect population reached its maximum on August 14,1995, at 30 C°, 36% relative humidity and no rainfall.

A number of natural enemies, including predators and parasitoids were recorded from pistachio orchards in Syria.