PGPR-Induced Biochemical Defense Mechanisms for Leafhopper (Amrasca devastans) Management in Okra Cultivation

Abstract

Okra (Abelmoschus esculentus L. Moench) is a widely grown vegetable in Asia, valued for its nutritional properties and culinary uses. Nevertheless, it is significantly threatened by leafhoppers (Cicadellidae), which can transmit various plant viruses. To promote sustainable production and protect the crop from pest damage, a field study was conducted on a microplot in Kasilingapuram, Karungulam block, Thoothukudi district, during the Rabi season of 2020 and the Summer of 2021. Different Plant Growth-Promoting Rhizobacteria (PGPRs) were applied to the hybrid COBh 4 okra cultivars via soil, seed, and foliar treatments, and their effects on leafhopper populations were evaluated. The results indicated a notable reduction in leafhopper population in Bacillus subtilis Bbv57 treated okra plants than untreated plants during both Rabi 2020 and Summer 2021 seasons. Likewise, the biochemical parameters were also observed in elevated levels in Bacillus subtilis Bbv57 treated plants in both the seasons. These findings suggest that the use of PGPRs may be an effective approach for managing leafhopper populations in okra cultivation.