الفعالية الأحيائية لبعض المستخلصات النباتية في الحلم العنكبوتي ذو البقعتين Acari : Tetranychidae)‎ Tetranychus urticae Koch)‎ مختبريا

الملخص EN

The effect of crudc extracts from more than 30 plant species belonging to different families were tested for feeding toxicity, repellent and antifecdant as well as oviposition deterrent activity against adult female of Tetranychus urticae Koch on common beans (Phaseolus vulgaris L.) at 21±rC and 60±10% RH.

Around 53% of the extracts were shown to have acaricidal properties.

'The crude extracts from 70% of plant species caused rq>ellent effects in T.

urticae female.

However, the repellent effects of some extracts did not last long.

Some of plant extracts had antiffccdanl effect in the female of the two spotted spider mite.

In addition to the toxic action and antifecdant effect, the extract of 12 plant species had also a definite oviposition deterrent efTect Preliminary results indicated that many of plant extracts have potentials in giving good protection of economic plants from phytophagous mites; they are indigenous and may be safe and readily available to farmers in Syria Key words: Biological activity, plant extracts, Svna, Tetranychus urticae Koch.