Potato tuber moth[Phthorimae operculella Zeller(Lep.:Gelechiidae)]is the most important insect causing damage of potatoes.It also causes significant damage to tomato and eggplant.The application of plant extracts to c...Potato tuber moth[Phthorimae operculella Zeller(Lep.:Gelechiidae)]is the most important insect causing damage of potatoes.It also causes significant damage to tomato and eggplant.The application of plant extracts to control insects is an effective alternative.In this study,the efficacy of extracts from Leptospermum petersonii Bailey(Myrtaceae),Achillea wilhelmsii C.Koch(Asteraceae)and Tanacetum parthenium L.(Asteraceae)on potato tuber moth using two different methods was investigated.Bioassays were used to determine the effect of varying concentrations(for L.petersonii 0.05%,0.1%,0.3%and 0.4%,for A.wilhelmsii and T.parthenium 1%,3%,6%and 12%)of extracts.Experiments were carried out using potato tuber of Solanum tuberosum L.Fourth instar larva of about were used in tuber dipping and larvae dipping methods.In tuber dipping method,the highest mortality(100%)occurred at concentration of 0.4%while the smallest mortality was at 0.05%the extracts of L.petersonii.It was determined that the extract of A.wilhelmsii and T.parthenium had the highest mortality at the highest concentration 85%and 90%respectively.In larva dipping method,the extracts of L.petersonii.A.wilhelmsii and T.parthenium showed the highest mortality at the highest concentrations 100%,82%and 87%respectively.The research was undertaken under laboratory conditions at the Plant Protection Central Research Institute.展开更多
Hyoscyamus niger L. （Solanaceae） and Hypericum calycinum L. （Hypericaceae） were collected from two provinces Bursa and Ankara in Turkey during flowering stages. Extracts obtained from H. niger and H. calycinum wer...Hyoscyamus niger L. （Solanaceae） and Hypericum calycinum L. （Hypericaceae） were collected from two provinces Bursa and Ankara in Turkey during flowering stages. Extracts obtained from H. niger and H. calycinum were tested against two-spotted mite as an acaricidal pesticide. Bioassay experiments were carried out under laboratory conditions using two different methods namely, leaf disc dipping and direct leaf spraying. Two-spotted mite was reared in insectary using Phaseolus vulgaris L. （Fabaceae）. In the leaf dipping method, H. niger extract resulted in an effective adjusted mortality for larvae of 87.13% and for adults of 81.66%. For H. calycinum the adjusted mortality for larvae and adults was 77.77% and 85.97% respectively at the highest concentration. In larval stage, LCs0 values were 5.47 w/v and 3.32 w/v dipping and spraying method respectively. In addition, adult stage, it was determined that LCs0 values were 1.17 w/v and 3.56 w/v in both methods. For leaf spraying method. H. niger resulted in an adjusted showed an effect against larvae and adults mortality rate was 95% and 91% respectively. However, H. calycinum mortality percentage was 80% and 87% at 12% concentration, with LC50 values of 9.62 w/v and 2.13 w/v in dipping method. In this research apart from mortality effects on egg, reproduction was also investigated. Each concentration showed that treated females laid less eggs compared to the untreated females.展开更多
Two-spotted spider mite(Tetranychus urticae Koch)(Acari:Tetranychidae)is a very serious pest worldwide,causing considerable damage to vegetables,flowers and fruit crops.The application of plant extracts to control ins...Two-spotted spider mite(Tetranychus urticae Koch)(Acari:Tetranychidae)is a very serious pest worldwide,causing considerable damage to vegetables,flowers and fruit crops.The application of plant extracts to control insects can be an effective alternative.In this study,the efficacy of an extract from Juglans regia L.(Juglandecaea)was tested as an alternative to conventional acaricides.Using two different methods,bioassays were used to determine the effects of varying concentrations J.regia(1%,3%,6%,12%)of the extracts.Experiments were carried out using 3 cm diameter leaf disks of Phaseolus vulgaris L.In addition,the effects of the extract on mite reproduction and oviposition were investigated.As a result,in the leaf dipping method,the 12%concentration of the extract caused the highest mortality of nymph(90%)and adult(83.00%)stages.For the spraying method,the mortality of adults at the same concentration was 100%.In bioassays at lower concentrations,the adult mites laid lower numbers of eggs in comparison to the untreated mites.The highest effect occurred at concentration of 12%and the lowest effect was at 1%.The extract was no observed ovicidal effect.展开更多
文摘Potato tuber moth[Phthorimae operculella Zeller(Lep.:Gelechiidae)]is the most important insect causing damage of potatoes.It also causes significant damage to tomato and eggplant.The application of plant extracts to control insects is an effective alternative.In this study,the efficacy of extracts from Leptospermum petersonii Bailey(Myrtaceae),Achillea wilhelmsii C.Koch(Asteraceae)and Tanacetum parthenium L.(Asteraceae)on potato tuber moth using two different methods was investigated.Bioassays were used to determine the effect of varying concentrations(for L.petersonii 0.05%,0.1%,0.3%and 0.4%,for A.wilhelmsii and T.parthenium 1%,3%,6%and 12%)of extracts.Experiments were carried out using potato tuber of Solanum tuberosum L.Fourth instar larva of about were used in tuber dipping and larvae dipping methods.In tuber dipping method,the highest mortality(100%)occurred at concentration of 0.4%while the smallest mortality was at 0.05%the extracts of L.petersonii.It was determined that the extract of A.wilhelmsii and T.parthenium had the highest mortality at the highest concentration 85%and 90%respectively.In larva dipping method,the extracts of L.petersonii.A.wilhelmsii and T.parthenium showed the highest mortality at the highest concentrations 100%,82%and 87%respectively.The research was undertaken under laboratory conditions at the Plant Protection Central Research Institute.
文摘Hyoscyamus niger L. （Solanaceae） and Hypericum calycinum L. （Hypericaceae） were collected from two provinces Bursa and Ankara in Turkey during flowering stages. Extracts obtained from H. niger and H. calycinum were tested against two-spotted mite as an acaricidal pesticide. Bioassay experiments were carried out under laboratory conditions using two different methods namely, leaf disc dipping and direct leaf spraying. Two-spotted mite was reared in insectary using Phaseolus vulgaris L. （Fabaceae）. In the leaf dipping method, H. niger extract resulted in an effective adjusted mortality for larvae of 87.13% and for adults of 81.66%. For H. calycinum the adjusted mortality for larvae and adults was 77.77% and 85.97% respectively at the highest concentration. In larval stage, LCs0 values were 5.47 w/v and 3.32 w/v dipping and spraying method respectively. In addition, adult stage, it was determined that LCs0 values were 1.17 w/v and 3.56 w/v in both methods. For leaf spraying method. H. niger resulted in an adjusted showed an effect against larvae and adults mortality rate was 95% and 91% respectively. However, H. calycinum mortality percentage was 80% and 87% at 12% concentration, with LC50 values of 9.62 w/v and 2.13 w/v in dipping method. In this research apart from mortality effects on egg, reproduction was also investigated. Each concentration showed that treated females laid less eggs compared to the untreated females.
文摘Two-spotted spider mite(Tetranychus urticae Koch)(Acari:Tetranychidae)is a very serious pest worldwide,causing considerable damage to vegetables,flowers and fruit crops.The application of plant extracts to control insects can be an effective alternative.In this study,the efficacy of an extract from Juglans regia L.(Juglandecaea)was tested as an alternative to conventional acaricides.Using two different methods,bioassays were used to determine the effects of varying concentrations J.regia(1%,3%,6%,12%)of the extracts.Experiments were carried out using 3 cm diameter leaf disks of Phaseolus vulgaris L.In addition,the effects of the extract on mite reproduction and oviposition were investigated.As a result,in the leaf dipping method,the 12%concentration of the extract caused the highest mortality of nymph(90%)and adult(83.00%)stages.For the spraying method,the mortality of adults at the same concentration was 100%.In bioassays at lower concentrations,the adult mites laid lower numbers of eggs in comparison to the untreated mites.The highest effect occurred at concentration of 12%and the lowest effect was at 1%.The extract was no observed ovicidal effect.
