Insecticidal effect of certain ecofriendly compounds on some scale insects and mealybugs and their side effects on antioxidant enzymes of mango nurslings.

摘要

This work was aimed to stop the using of conventional scalicides in controlling scale insects and mealybugs; so rosacide, cascade and ibex oily were evaluated on Aulacaspis mangiferae (Newst.) and Icerya seychellarum (Westw.) which were reared on mango nurslings. Obtained results cleared that females of A. mangiferae reduced by average of 97.6, 41.9 and 56.2% and nymphs reduced by 99.1, 75.3 and 22.8% when rosacide, cascade and ibex oily were sprayed, respectively. Also, I. seychellarum females were reduced by average of 82.4, 80.6 and 88.3% and nymphs were reduced by 91.7, 84.7 and 96.3% at the same arrangement. It is deduced that population of A. mangiferae responded to cidal effect of rosacide, cascade and ibex oily by average reduction of 98.3, 58.6 and 39.5%, respectively. Population of I. seychellarum responded to the same compounds by higher average of 87.1, 82.6 and 92.3% reduction, respectively. Antioxidant activities of superoxide dismutase, catalase and polyphenol oxidase enzymes as well as total Indole acetic acid and total phenol contents had been investigated. It is well known that the insect infestation increased plant enzymes activity to defence them against insect attack. So, the results clarified a significant reduction in all the treated tested enzymes and were more pronounced for rosacide treatment than cascade and ibex oil. This reflect the order of efficiency of the tested compounds in controlling the tested insects. So, treatments with natural insecticide had effective tools in controlling A. mangiferae and I. seychellarum.