تأثير استخدام المستخلص الهكساني لنبات خناق الدجاج في بعض المظاهر الحياتية لحلمة الغبار Oligonychus afrasiaticus (Acari : Tetranchidae)‎

الملخص EN

This study has been done to explore the efficiency of hexan extract of Euphorbia heleoscopia on some biological fields of dust mite Oligonychus afrasiaticus in lap.

The extract was used in three concentrations (0.25, 0.5, 1) %, the results showed that the hexane extract in Conc.1 % gave the highest percentage of killing against dust mite eggs which amount to 44.4 % as well as gave the highest percentage of killing against larvae stage, nymph stage and adults which amount to (73, 67.78, 59.34) %, respectively.

The study demonstrated that the Conc.1% achieve the longest duration of egg incubation which was 4.8 days while the shortest incubation time occur at Conc.0.25 % which was 3.8 day.

For the efficiency of hexane extract of Oligonychus afrasiaticus on development time of both larvae an nymph and on generation time, the results proved that the Conc.

1 % extended the development time 4.35 days for larvae, 7.78 days for nymph ant till 17.85 days for generation time.

In addition the hexan extract has activity on the number of product eggs from treated female and parentage of hatch eggs, the concentration 1 % decreased the number of produced eggs to 4.67 eggs in compare with control which reached 12.67 eggs while the percentage of killed eggs was 23.67 % s.