عنوان مقاله [English]
نویسنده [English]چکیده [English]
During 1997-1998, five different doses of emulsifiable mayonnaise oil (1 , 1.5 , 2 , 2.5 and 3 percents) and a control in three replications were tested against nymphal stages of olive psylla (EuphyUura olivina) in late April (a few days before blooming) in a complete randomized block design. Population densities of nymphal stages of pest were counted one day before and five days after oil application in randomly selected twigs. Number of live nymphs on twigs and mortality were calculated by Sun-Shepard formula. Statistical analysis showed no significant differences among five oil treatments (nymphal stages control
percentage in Spring). Results showed that there was a significant difference between oil treatments and control (with 66.33% infection), but the differences among five oil treatments were not significant. Meanwhile, during two year study, no phytotoxicity occurred in all treatments. Therefore, the use of spring oil was recommended to control this pest.