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Biocontrol potential of Steinernema cholashanense (Nguyen) on larval and pupal stages of potato tuber moth, Phthorimaea operculella (Zeller)

Published online by Cambridge University Press:  10 September 2020

P.H. Mhatre*
Affiliation:
ICAR-Central Potato Research Station, Udhagamandalam, Nilgiris, 643004, Tamil Nadu, India
J. Patil
Affiliation:
ICAR-National Bureau of Agricultural Insect Resources, Bengaluru, 560024, Karnataka, India
V. Rangasamy
Affiliation:
ICAR-National Bureau of Agricultural Insect Resources, Bengaluru, 560024, Karnataka, India
K.L. Divya
Affiliation:
ICAR-Central Potato Research Station, Udhagamandalam, Nilgiris, 643004, Tamil Nadu, India
S. Tadigiri
Affiliation:
ICAR-Central Tuber Crop Research Institute, Thiruvananthapuram, 695017, Kerala, India
G. Chawla
Affiliation:
ICAR-Indian Agricultural Research Institute, Pusa Campus, 110012, New Delhi, India
A. Bairwa
Affiliation:
ICAR-Central Potato Research Station, Udhagamandalam, Nilgiris, 643004, Tamil Nadu, India
E.P. Venkatasalam
Affiliation:
ICAR-Central Potato Research Station, Udhagamandalam, Nilgiris, 643004, Tamil Nadu, India
*
Author for correspondence: P.H. Mhatre, E-mail: priyank.iari@gmail.com

Abstract

The potato tuber moth, Phthorimaea operculella (Zeller), is a serious pest of potato and other commercial crops belonging to the Solanaceae family. In recent years, it has become an emerging problem in potato-growing regions of the Nilgiri hills of southern India. It is responsible for the reduced quality and quantity of marketable potatoes. In this regard, the development of an eco-friendly control method for the management of the potato tuber moth is urgently required. Therefore, in the present study, the virulence of Steinernema cholashanense CPRSUS01 originally isolated from the potato rhizosphere was tested on fourth-instar larvae and pupae of P. operculella. Steinernema cholashanense caused the greatest mortality in the fourth-instar larval stage (100%) than the pupae (30%). In addition to this, penetration and reproduction of this nematode was also studied in fourth-instar larvae of P. operculella and this is the first report of penetration and reproduction of any entomopathogenic nematode species on potato tuber moth larvae. The reproduction capacity of S. cholashanense on P. operculella is higher (702 infective juveniles mg−1 body weight). Our results indicated that S. cholashanense has good potential as an alternative tool for the management of P. operculella. But before including S. cholashanense in the integrated pest management program of P. operculella, its efficacy should be tested under field conditions.

Type
Short Communication
Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press

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