Predatory insects as biological control agents against walnut aphids in Kashmir, India

Shaziya GULL; Razia RASHEED

doi:10.14720/aas.2024.120.1.13569

Authors

Shaziya GULL Entomology Research Unit, Department of Zoology, University of Kashmir, Srinagar, Jammu and Kashmir, India
Razia RASHEED Entomology Research Unit, Department of Zoology, University of Kashmir, Srinagar, Jammu and Kashmir, India

DOI:

https://doi.org/10.14720/aas.2024.120.1.13569

Keywords:

pest management, sap suckers, coccinellids, walnut aphids, Calvia punctata, Harmonia dimidiata, Metasyrphus latifasciatus, predatory potential

Abstract

Management of pests by biological control agents is a natural and environmental friendly method. It is an important part of integrated pest management programs where biological predators play a significant role in controlling various pests. During the present study, different insect pests were observed infesting walnut trees and fruits causing significant damage to the walnut orchards. Among these pests, sap suckers were found to cause notable damage out of which aphids were most dominating pests. High population of walnut aphids causes leaf drop, reduced tree vigour, nut quality and size. In addition to this, some insect predators were also observed on these walnut aphids. Six species of predaceous coccinellid beetles were found on walnut leaves in interaction with walnut aphids and they were identified belonging to sub family Coccinellinae. Among which Calvia punctata (Mulsant, 1853) and Harmonia dimidiata (Fabricius, 1781) were the most encountered species. Besides, one species from syrphidae family Metasyrphus latifasciatus (Macquart, 1859) was also observed. Moreover, extreme feeding potential was noted among these predators.

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