Evaluation of the effect of dormant oil and pyriproxyfen insecticide in controlling boxleaf euonymus scale (unaspis euonymi)

This study evaluated the effects of emulsifiable dormant oil and citronella oil each at a concentration of ۰.۷%, pyriproxyfen insecticide at ۰.۲۵, ۰.۵, and ۰.۷ per thousand, combinations of dormant oil + pyriproxyfen (۰.۲۵, ۰.۵, and ۰.۷ per thousand), and citronella oil + pyriproxyfen (۰.۲۵, ۰.۵, and ۰.۷ per thousand), along with water (as control), were evaluated on Unaspis euonymi, one of the major pests of boxwood shrubs. For each treatment, ۶ branches were randomly sampled at intervals of one day before, and ۳, ۷, and ۱۴ days after spraying. The number of live insects on the upper ۲ cm of each branch was counted. Raw data averages were converted into mortality percentages using the Henderson-Tilton formula, and means were compared using Tukey's test at the ۵% level. Results showed that ۳ days after spraying, the highest and lowest mortality rates of the scale insect were recorded in treatments with ۰.۷% dormant oil (۷۳.۲۴%) and ۰.۲۵ per thousand pyriproxyfen (۲۶.۲%), respectively. Seven days after spraying, the combination of ۰.۷ per thousand pyriproxyfen + ۰.۷% dormant oil resulted in ۸۱.۲۲% mortality on boxwood scales, representing the highest effectiveness. The combination of pyriproxyfen + ۰.۷% citronella oil also showed ۷۱.۴۱% mortality, indicating high efficacy compared to other treatments. Overall, treatments combining oils with pyriproxyfen had higher mortality rates, especially ۰.۷% dormant oil + pyriproxyfen, while pyriproxyfen alone had the least effect. The results indicate that pyriproxyfen, when combined with oils, can be effectively used in integrated management programs against Unaspis euonymi.

کلیدواژه ها:

Unaspis euonymi ، boxwood shrub ، green space ، pyriproxyfen