Determination of the efficacy of some entomopathogenic nematodes against Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae) under laboratory conditions

Authors : Galip KAŞKAVALCI, Sevgi TÜRKÖZ

Pages : 0-0

Doi:10.16970/ted.92606

View : 40 | Download : 15

Publication Date : 2016-06-16

Article Type : Research Paper

Abstract :The tomato leafminer, Tuta absoluta insert ignore into journalissuearticles values(Meyrick); insert ignore into journalissuearticles values(Lepidoptera: Gelechiidae); which was first detected in Izmir Province, Turkey in 2009 has spread quickly and has become the major pest in tomato producing areas. The efficacy of three different entomopathogenic nematode insert ignore into journalissuearticles values(EPN); species isolates insert ignore into journalissuearticles values(from e-nema ® GmbH Schwentinental, Germany);, Heterorhabditis bacteriophora insert ignore into journalissuearticles values(Poinar);, Steinernema carpocapsae insert ignore into journalissuearticles values(Weiser); and Steinernema feltiae insert ignore into journalissuearticles values(Filipjev); was investigated against T. absoluta during 2013-2014 under laboratory conditions. The EPNs were applied with different inoculation rates insert ignore into journalissuearticles values(1, 2, 5, 10, 15, 20, 25 and 40 infective juveniles per larva); for each species to the third instar larvae of T. absoluta outside the leaves. The mortality rates for H. bacteriophora, S. carpocapsae and S. feltiae were found between 21.2 - 74.2%, 28.8 - 99.4% and 17.5 - 95.2%, respectively. According to the results, S. carpocapsae and S. feltiae caused similar mortalities at the given inoculation rates while H. bacteriophora had lower efficacy compared to those two species. The values of LD 50 for H. bacteriophora, S. carpocapsae and S. feltiae were 21.67, 7.13 and 6.25 infective juveniles per larva, respectively. Based on these data, S. feltiae was the most efficient nematode species, and was then applied against the larva of T. absoluta inside the mines and pupae. However, S. feltiae only caused low mortality of larvae both inside mines insert ignore into journalissuearticles values(19%); and the pupae insert ignore into journalissuearticles values(7%);. These results revealed that EPN have good potential for the control of T. absoluta larvae outside the leaves and should be studied further.
Keywords : Efficacy, Heterorhabditis, Steinernema, tomato, Tuta absoluta

ORIGINAL ARTICLE URL