Effect of mineral oils, insecticidal soap (Palizin®) and chlorpyrifos on Unaspis euonymi Comstock (Hem.: Diaspididae) underfield conditions

Document Type : Research Paper

Authors

1 Plant Protection Research Department, Mazandaran Agricultural and Natural Resources Research and Education Center, Agricultural Research, Education and Extension Organization (AREEO), Sari, Iran

2 Iranian Research Institute of Plant Protection, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran

3 Research Division of Natural Resources, Mazandaran Agricultural and Natural Resources Research and Education Center, Agricultural Research, Education and Extension Organization (AREEO), Sari, Iran

Abstract

Effect of two types of mineral oils, EC and mayonnaise at two concentrations of 5ml/L and 7 ml/L, insecticidal soap Palizin® 2.5 ml/L, chlorpyrifos 1.5 ml/L, chlorpyrifos 1.5 ml/L + EC oil at concentration of 5ml/L, chlorpyrifos 1.5 ml/L + mayonnaise oil at concentration of 5ml/L and water as control was investigated on Unaspis euonymi as an important pest of boxwood, Euonymus sp. Six branches were sampled randomly from each treatment one day before spraying and 3, 7, 14 and 21 days after spraying and number of live insects were counted on 2 cm at the top of branch and 2 cm2 in the middle portion of underside of two leaves. Corrected mortality and mean comparison were determined by using the Henderson-Tilton formula and Tukey test at 0.05% probability level, respectively. In 2016, at 3 days after spraying on leaves, mineral oil EC at concentration of 7 ml/L with 67.9% mortality and chlorpyrifos 1.5 ml/L + EC 5 ml/L with 78.3%, 69.1% and 52% mortalities, respectively at 7, 14 and 21 days after spraying were more efficient treatments. On the branches, chlorpyrifos 1.5 ml/L + EC 5 ml/L was more efficient than other insecticides in all sampling days after spraying causing highest percentage of mortality. In 2017, chlorpyrifos 1.5 ml/L + EC 5 ml/L treatment was more efficient against U. euonymi when the leaves sprayed. Chlorpyrifos 1.5 ml/L + mayonnaise 5 ml/L at 3 days after spraying of the branches caused 55.7% mortality and at 7, 14 and 21 days after spraying, chlorpyrifos 1.5 ml/L + EC 5 ml/L with 69.7, 79.2 and 80.4% mortality was more toxic than other treatments. The results indicated that chlorpyrifos in combination with oil can be used in control programs of U. euonymi.

Keywords

References

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Plant Pest Research
Volume 8, Issue 2
September 2018
Pages 41-51

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  • Receive Date: 15 September 2018
  • Accept Date: 15 September 2018

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