الكثافة العددية للبقة (Fabricius)‎ Dionconotus neglectus neglectus (Hemiptera : Miridae)‎ على نبات البصل في سورية

الملخص EN

The onion bug D.

neglectus neglectus attacks onion plants at the coastal region in Syria and causes serious damage.

The population dynamics of this bug was studied in two different areas including Al-Jemaseh region (A) and Safita region (B) along the Syrian coast during the years 2015 and 2016.

The results obtained indicated that the population density of adult bug was higher than nymph density, whereas the adult density was 88.72% and 98.8% of reading from total density in region A during 2015 and 2016, respectively.

No nymph occurrence was recorded in region B during the two years.

The presence of the adult bug was recorded from the end of February until April and the highest population density was in March.

The number of bugs reached 2.48 and 1.93 bug/m2 on 19 and 13 Marsh in region A during 2015 and 2016, respectively.

The values of bug density were also the highest in March in region A with an average of 1.11 and 1.46 bug/m2 on 12 and 20 March during 2015 and 2016, respectively.

This bug totally disappeared in April from the onion crop.

The bug caused a serious damage on the onion plants with some of the plants died.

These results indicated that the onion bug is an important pest on the onion crop, consequently more studies are needed to define the management tools for optimal control of this pest.