كفاءة مبيدي باهيا وفندكم في مكافحة حشرة الحميرة Batrachedra amydrraula (M.) و حلم غبار النخيل Oligonychus arrasiaticus خلال أوقات مختلفة و على أجزاء متعددة من نخلة التمر

The research has been conducted to determine the impact of control periods and the targeted part of date palm on the efficiency of (abamectin 28% and cypermethrine 72%) and fendkm (fenvalarate 20%) against lesser moth insect and dust mites. Each pesticides were sprayed at three periods winter 16 February, spring 10 April and summer 20 May during season 2011, three parts of palm were selected as a target spraying which were all parts of palm, vegetable and fruiting and trunk .A significant difference has been revealed among the results of pesticides effeteness; the Bahia treatment showed the lowest average of lesser moth infestation and fruit dropping and reported : 58.32 and 13.30% , respectively similar results were recorded with dust mite infestation and intensity and reached 6.44% and 3.11 mite /fruit respectively .Also the efficiency of pesticide has been effected significantly by the time of spraying , the periods of winter and spring control showed the highest level of efficiency in terms of decreasing the infestation and reached 69.61 and 70.56% respectively, while the dropping percent was the lowest at the winter control and reached 19.30% . Regarding mites infestation the lowest percent has been at the spring control and reported the percent of 25.92%, Both summer and spring control showed the lowest intensity which were 7.11 and 7.14 mite/fruit. The results showed significant differences for the targeted parts of date palm and their impact on the controlling efficiency. All date palm parts showed the lowest infestation and fruit dropping percent which were 68.96 and 20.66% respectively , for lesser moth . Similar results has been seen for dust mites. أجري البحث لمعرفة تأثير موعد المكافحة بالمبيدات الكيميائية و الجزء المكافح من نخلة التمر على كفاءة مبيدي باهيا (ابامكتين 28 % و سايبرمثرين 72 %) و فندكم (فنفالريت 20 %) في مكافحة حشرة الحميرة Batrachedra amydraula (M.) (Lepidoptera : Cosmopterygidae) و حلم غبار النخيل Oligonychus afrasiaticus (Acari : Tetranychidae) (M.). رشت المبيدات بثلاث مواعيد للمكافحة هي الشتوية في 16 شباط، و الربيعية في 10 نيسان، و الصيفية في 20 أيار خلال عام 2011، و كانت معاملات الرش كالآتي : 1-جميع أجزاء النخلة 2-الجزء الخضري و الثمري 3-الساق. أظهرت النتائج وجود اختلافات معنوية في نسبة الإصابة و نسبة التساقط بحشرة الحميرة باختلاف نوع المبيد إذ سجل المبيد باهيا أقل نسبة إصابة و نسبة تساقط بحشرة الحميرة بلغت 58.32 و 13.30 % على التوالي، و أقل نسبة و شدة إصابة بحلم غبار النخيل بلغت 6.44% و 3.11 حلمة / ثمرة على التوالي. كما كان ل