| Titles |
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English :
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Acaricidal activity of spinosad and abamectin against two-spotted spider mites
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Arabic :
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التأثير ألمبيدي للمركبين الحيويين “spinosad” و “abamectin” ضد الاكاروس ذو البقعتين
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| Abstract |
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 urlico 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 st susceptible laboratory strain using direct spraying of leaf disks with five rates of spinosad (20, 25, 35 and 40 mg/I), five rates of abamectin (0.125. 0.25, 0.5, 1 and 2.5 mg/1), 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 mortality 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 abanaectin 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.
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| Publication year |
2007
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| Pages |
129-135
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| Availability location |
معهد بحوث وقاية النباتات-ش نادى الصيد-الدقى-الجيزة
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| Availability number |
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| Organization Name |
Plant Protection Research Institute (PPRI)
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| serial title |
Experimental of Applied Acarology
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| Author(s) from ARC |
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| External authors (outside ARC) |
مها فريد سليمان
كلية العلوم -جامعة قناة السويس
مصطفى حسين النجار
كلية العلوم - جامعة قناة السويس
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| Agris Categories |
Pests of plants
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AGROVOC
TERMS |
Avermectins.
Fertility.
Tetranychus urticae.
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| Publication Type |
Journal
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