دراسة حياتية مجتمع ذبابة أوراق الزيتون Dasineura oleae F. Löew على أشجار الزيتون في بعض مناطق الساحل السوري

الملخص EN

The study described the life cycle of olive leaf midge Dasineura oleae F.

Löew during 2013 and 2014 along the Syrian coast.

There were different numbers of swellings on leaves and inflorescences associated with the infestation with this insect, with most damage occurred in the middle of the leaf.

The study of leaf swellings showed that olive leaf midge D.

oleae ceased its development in the second larval stage from July until the end of December and in early January.

The second larval stage reached 81.36% to 100% in 2013.

D.

oleae continued its life cycle and molted to the third larval stage, which lasted 23.9 days.

The third larval stage reached the peak of 43% during January and February in 2013, whereas in 2014 it reached 44.77% in January and down to 21.74% in February.

The pupal stage lasted 10.7 days, with highest pupation rate in February and reached 27.27% and 45.29% for 2013 and 2014, respectively.

Adults appeared towards the end of February and reached the peak of 27.05% and 28.27% in March of 2013 and 2014, respectively.

The females laid eggs on leaves lower surface and inflorescences singly or in small groups of 4-6 eggs.

The eggs needed 13.9 days to hatch.

The first larval stage reached 20% in March and 25% in April and June in 2013 and 22.81% in March 2014.

One generation of olive leaf midge per year was recorded in 2013 and 2014.