2003/11/20 by R. Sattari Nasab, M. Pahlavan Yali, Maryam Pahlavan Yali +3 · 1 citation
Agricultural and Biological Sciences · Pharmacology, Toxicology and Pharmaceutics · #Composting and Vermicomposting Techniques #Humic Substances and Bio-Organic Studies #Phytochemistry and biological activities of Ficus species #Plant Growth Enhancement Techniques #Plant-Microbe Interactions and Immunity #Plant-based Medicinal Research
paper · doi:10.1017/s0007485318000779
openalex publication_date 2003/11/20 · openalex created_date 2016/06/24 · crossref issued 2018/10/23 · crossref published 2018/10/23 · crossref published-online 2018/10/23 · crossref created 2018/10/23 · crossref published-print 2019/08/01 · crossref deposited 2024/07/11 · openalex updated_date 2026/04/28 · crossref indexed 2026/07/30
The cabbage aphid, Brevicoryne brassicae L. (Hem: Aphididae), is an important pest of canola that can considerably limit profitable crop production either through direct feeding or via transmission of plant pathogenic viruses. One of the most effective approaches of pest control is the use of biostimulants. In this study, the effects of humic acid, plant growth-promoting rhizobacteria (PGPR), and integrated application of both compounds were investigated on life table parameters of B. brassicae, and the tolerance of canola to this pest. B. brassicae reared on plants treated with these compounds had the lower longevity, fecundity, and reproductive period compared with control treatment. The intrinsic rate of natural increase (r) and finite rate of increase (λ) were lowest on PGPR treatment (0.181 ± 0.004 day-1 and 1.198 ± 0.004 day-1, respectively) and highest on control (0.202 ± 0.005 day-1 and 1.224 ± 0.006 day-1, respectively). The net reproductive rate (R0) under treatments of humic acid, PGPR and humic acid + PGPR was lower than control. There was no significant difference in generation time (T) of B. brassicae among the tested treatments. In the tolerance test, plants treated with PGPR alone or in integrated with humic acid had the highest tolerance against B. brassicae. The highest values of total phenol, flavonoids, and glucosinolates were observed in treatments of PGPR and humic acid + PGPR. Basing on the antibiosis and tolerance analyses in this study, we concluded that canola plants treated with PGPR are more resistant to B. brassicae. These findings could be useful for integrated pest management of B. brassicae in canola fields.