Efficacy of Biopesticides for Management of Root Knot Nematode on Tomato
Zia Uullaha, Nazir Javed, Sajid Aleem Khan, Imran Ul Haq and Qaiser Shakeel
Department of Agriculture (Plant Protection), Pest Warning and Quality Control of Pesticides, Hafizabad, Punjab, Pakistan.
Biopesticides are being tested in control parasitic nematodes as a replacement for synthetic chemicals. This study was undertaken to investigate effects of the biopesticides abamectin, emamectin and biosal on egg hatch and mortality of second instar juveniles (J2) of Meloidogyne incognita (Kofoid and White) Chitwood, under laboratory and field conditions on tomato (Solanum lycopersicum L). Treatments consisted of the biopesticides and a water (control). Numbers of J2 hatched was determined at 1, 3 and 6 days and mortality of J2 at 12, 24 and 48 hr after inoculation. Evaluation of biopesticides under field conditions was for yield, numbers of flowers, numbers of fruit per plant, average fruit weight, shoot and root length, numbers of galls and egg masses per root system and nematode rate of reproduction. Abamectin was more effective than emamectin and biosal against M. incognita under laboratory and field conditions. Application of abamectin produced the highest juvenile mortality, increased fruit weight and increased reduction in egg hatch, gall number, egg mass number and rate of reproduction. Abamectin can be used under field conditions for management of M. incognita.
Keywords: Meloidogyne incognita, Solanum lycopersicum, biopesticides, Pakistan, rate of reproduction, tomato