Induction of resistance againstBrevicoryne brassicaebyPseudomonas putidaand salicylic acid in canola

Abstract

AbstractThe cabbage aphid,Brevicoryne brassicaeL. (Hem: Aphididae), is one of the most serious pests of canola worldwide. In this research, the effects ofPseudomonas putida, salicylic acid (SA), and integrated application of both inducers were studied on the resistance of canola toB. brassicae. In free-choice situation, the number ofB. brassicaeattracted on canola plants under treatments containingP. putidaand SA was significantly lower compared to control plants. In the life table study, pre-adult survival, longevity, reproductive period, and fecundity of this aphid were lowest on plants treated withP. putida+ SA. The net reproductive rate (R0), intrinsic rate of population increase (r), and finite rate of increase (λ) ofB. brassicaedecreased significantly in the following order: control (47.19 offspring, 0.293 and 1.340 day−1),P. putida(16.7 offspring, 0.238 and 1.269 day−1), SA (6.37 offspring, 0.163 and 1.178 day−1), andP. putida+ SA (3.24 offspring, 0.112 and 1.119 day−1). Moreover, the beneficial effect of the integrated application ofP. putidaand SA on plant growth parameters was significantly evident in our study. The highest values of glucosinolates, total phenol, and flavonoids were recorded inP. putida+ SA treatment. We concluded that canola plants treated withP. putida+ SA are more resistant to the cabbage aphid. These findings demonstrated that SA integrated withP. putidaon canola plants act effectively for reducing the population ofB. brassicaeand can be used in integrated management programs of this pest.