تأثير بعض المستخلصات المائية النباتية على النشاط البايولوجي لحشرة الذبابة البيضاء Bemisiatabaci (Genn)‎ في البيوت المحمية

الملخص EN

The objectives of this study were evaluating some plant extracts as biotic inducers to induction systemic acquired resistance in the tomato plants against Whitefly Bemisiatabaci under greenhouse conditions .The present study was conducted to evaluate the effect of some water plant extract ( Mirabilis jalapa , Eruca sativa& Rheum rhabarbarum)to find out the best way for their control.

Condition of Water extract on eggs, nymphs and adults of Whitefly.

The resulte show that Water extract had a high mortality percentage on adults of the Whitefly, by M.

jalapawere the highest 78.00% , followed by E.

sativa and R..

rhababarumthe lowest with 62.33 and 39.33% respectively after one day of treatment .On nymphs M.

jalapa give high mortality percentage so butafter one day were98%, while.

E.

sativa extract was mortality rate 90.67% , also the R..

rhababarumwas gave less effective reaching mortality rate with 69.00% .The results also showed that the mortality rates of eggs was Increased after one day when the high mortality percentage of egg was 80.00 , 78.67 and 48.33 % for each of M.

jalapa ,E.

sativa and R..

rhababarumrespectively .While the incidence of white fly insect in the green house before treatment rate was 53.93%, but the maximum reduction in the incidence of white fly insect arrived when sprayed plant extract to the M.

jalapa amounting to 12.53%.