عنوان المقالة:النشاط الاكاروسي لمبيدي سبينوساد و ابامكتين ضد الحلم العنكبوتي ذي البقعتين Acaricidal activity of Spinosad and Abamectin against two-spotted spider mites
د/منال سيد محمد اسماعيل- ا.د/ مها فريد سليمان- ا.د/مصطفي النجار- ا.د/ مني محمد احمد غلاب
المؤلفون بالإنجليزي
Ismail, M.S., Soliman, M.F., El Naggar, M.H. and Ghallab, M.M.
الملخص الانجليزي
Spinosad is a bioinsecticide with a high degree of selective toxicity towards
insects of different orders, but its toxicity towards the two-spotted spider mite (TSSM),
Tetranychus urticae Koch (Acari: Tetranychidae) is under debate. In this study, we
compared the acaricidal properties of spinosad with the commercial bioacaricide
abamectin on the life stages of TSSM. Adulticide and ovicide bioassays were performed on
a susceptible laboratory strain using direct spraying of leaf disks with five rates of spinosad
(20, 25, 30, 35 and 40 mg/l), five rates of abamectin (0.125, 0.25, 0.5, 1 and 2.5 mg/l),
sublethal concentrations or a combination of spinosad and abamectin. Both adulticidal and
ovicidal effects of spinosad against T. urticae in the laboratory were apparent, based on
morality rates of the adults, reduction of female fecundity and death of offspring.
Abamectin was also found to significantly reduce female fecundity and killed offspring
when applied directly on the eggs. Interestingly, sublethal concentrations of spinosad
reduced female fecundity stronger than abamectin. When a mixture of spinosad and
abamectin was applied at LC50, mortality was 74%, fecundity reduction was comparable to
abamectin alone and egg hatching rate was lower than by either compound alone. In
conclusion, spinosad was more harmful than abamectin for TSSM life stages and the
combined application is recommended.
تاريخ النشر
03/07/2007
الناشر
Experimental and Applied Acarology, Springer
رقم المجلد
43
رقم العدد
رابط DOI
https://doi.org/10.1007/s10493-007-9108-8
الصفحات
129–135
الكلمات المفتاحية
Spinosad Abamectin Tetranychus urticae Adulticide Ovicide Fecundity Offspring development
منال سيد محمد إسماعيل | Manal Sayed Mohamed Ismail | 2495