effects of hexaflumuron and spirodiclofen on functional response of hippodamia variegata at different densities of agonoscena pistaciae
نویسندگان
چکیده
common pistachio psylla, agonoscena pistaciae burckardt and lauterer (hemiptera: aphalaridae) is one of the economical pest among the pistachio orchards. the adonis' ladybird, hippodamia variegata (goeze) (col: coccinellidae) is one of the most prominent coccinellid predator in pistachio orchards. it is omnivorous and feed on aphids and psylla. functional response studies using a suitable index of the successful of natural enemy in the biological control programs for pests. sometimes the application of pesticides have indirect effects on functional response and related behaviors of predators. in this study, the effects of insecticide: hexaflumuron and acaricide spirodiclofen were investigated on functional response of the 4th instars larvae of h. variegata in controlled conditions (26±2ºc, 60±5٪ rh, 16l: 8d). for this purpose, different densities including 4, 8, 16, 32, 64, 95, 128, 150, 200 and 300 5th instars nymphs of common pistachio psylla were placed on pistachio leaf disc in a petri dish. larvae were treated with field recommended concentration by topical application method. type of functional response, the searching efficiency (a) and handling time (th) were estimated by using logistic regression and non-linear regression methods, respectively using sas software. according to the result, functional response was type ii in all treatments. searching efficiency in hexaflumuron, spirodiclofen and control were estimated 0.077±0.014, 0.098±0.030 and 0.125±0.245 h-1, and for handling time were 0.13±0.017, 0.11±0.023 and 0.01±0.12 h respectively. this achievement shows that these pesticides do not change the potential of h. variegata significantly.
منابع مشابه
Side Effects of Spirotetramat and Imidacloprid on Hippodamia variegata Goezee Feeding on Agonoscena pistaciae Burckhardt & Lauterer
The Adonis ladybird, Hippodamia variegataGoeze (Coleoptera: Coccinellidae) is known as an important predator of the Common pistachio psylla, Agonoscena pistaciae Burckhardt & Lauterer (Hemiptera: Psyllidae). Despite using the selective pesticides to manage the pests in the pistachio orchards, these chemicals have influenced non-target organisms like predators and parasitoids. ...
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عنوان ژورنال:
کنترل بیولوژیک آفات و بیماری های گیاهیجلد ۱، شماره ۱، صفحات ۱-۱۰
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