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Insects 2017, 8(1), 19; doi:10.3390/insects8010019

Assessment of Trichogramma japonicum and T. chilonis as Potential Biological Control Agents of Yellow Stem Borer in Rice

1
MoA-CABI Joint Laboratory for Bio-Safety, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, 2 West Yuan-Ming-Yuan Road, Haidian District, Beijing 100193, China
2
CABI Europe-Switzerland, Rue des Grillons 1, Delémont CH-2800, Switzerland
3
Plant Protection and Quarantine Station, Dehong Prefecture Agriculture Bureau, Dehong 678400, China
4
Dryland Farming Institute, Hebei Academy of Agricultural and Forestry Sciences, Hengshui 053000, China
5
State Key Laboratory for Biology of Plant Disease and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
*
Authors to whom correspondence should be addressed.
Academic Editors: Andrew G. S. Cuthbertson and Eric W. Riddick
Received: 24 December 2016 / Revised: 23 January 2017 / Accepted: 24 January 2017 / Published: 8 February 2017
(This article belongs to the Special Issue Biological Control of Invertebrate Pests)
View Full-Text   |   Download PDF [3005 KB, uploaded 8 February 2017]   |  

Abstract

Two species of Trichogramma wasps were assessed for their effectiveness against yellow stem borer Scirpophaga incertulas. A laboratory cage test with T. japonicum and T. chilonis showed that both species parasitized yellow stem borer egg masses at 60.0% ± 9.13% and 40.7% ± 7.11%, respectively, with egg parasitism rates of 15.8% ± 22.2% for T. japonicum and 2.8% ± 5.0% for T. chilonis. Once the host eggs were parasitized, emergence rates were high for both species (95.7% ± 0.12% for T. japonicum and 100% for T. chilonis). In paddy field trials, the two Trichogramma species were released at three densities (50,000/ha, 100,000/ha and 200,000/ha) in Southwestern China. Egg mass parasitism was 9% ± 7.7% for T. japonicum and 15% ± 14.1% for T. chilonis, and again only a relatively small fraction of eggs was successfully parasitized. No clear conclusion could be drawn on the most efficient release rate as no significant differences were found among the three release rates. A comparison of field-collected T. japonicum with T. japonicum and T. chilonis mass reared on Corcyra cephalonica showed significantly larger body size and ovipositor length in field-collected wasps, suggesting potentially higher effectiveness on yellow stem borer eggs after at least one generation on the target host. Factors contributing to the low field parasitism rates are discussed. View Full-Text
Keywords: Trichogramma; yellow stem borer; parasitism rate; field release Trichogramma; yellow stem borer; parasitism rate; field release
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MDPI and ACS Style

Tang, R.; Babendreier, D.; Zhang, F.; Kang, M.; Song, K.; Hou, M.-L. Assessment of Trichogramma japonicum and T. chilonis as Potential Biological Control Agents of Yellow Stem Borer in Rice. Insects 2017, 8, 19.

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