NDLI: Enabling mycelial application of Hirsutella thompsonii for managing the coconut mite

Content Provider	Springer Nature Link
Author	Sreerama Kumar, P. Singh, Leena
Copyright Year	2008
Abstract	Laboratory and field studies were conducted to examine the prospect of mycelial application of Hirsutella thompsonii as an alternative to the use of mycelial–conidial formulations of the fungus in the suppression of the coconut mite, Aceria guerreronis. In a series of laboratory experiments, glycerol, yeast extract powder and dehydrated malt extract broth were found to be the best among nine substances investigated as possible adjuvants for use on coconut palms in the field along with H. thompsonii mycelia. H. thompsonii biomass in the presence of adjuvants not only produced more colonies but also yielded more conidia per pellet. In terms of the density of conidia generated on a mycelial mat the treatments varied highly significantly in two methods, with glycerol showing an average of 106% increase over control. Though irradiance with simulated sunlight resulted in reduced conidiogenesis, in general, adjuvant-treated pellets, both exposed and unexposed to simulated sunlight, produced substantial conidiation compared with control, irrespective of the two incubation conditions. Better conidiation was observed under alternating light–dark regime than under total darkness in all the treatments. Glycerol boosted the pathogenicity of H. thompsonii by 16.5% over control. In the field, a newly developed mycelial formulation of H. thompsonii applied after tank-mixing separately with the three selected adjuvants brought down the post-treatment population of the coconut mite by 85.6–97.1%. Application of the fungus in combination with glycerol resulted in a tolerable mean nut damage grade of 2.0 during the pre-harvest stage, compared with an acute score of 4.0 in control palms.
Starting Page	169
Ending Page	182
Page Count	14
File Format	PDF
ISSN	01688162
Journal	Experimental & Applied Acarology
Volume Number	46
Issue Number	1-4
e-ISSN	15729702
Language	English
Publisher	Springer Netherlands
Publisher Date	2008-08-07
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Aceria guerreronis Adjuvants Coconut eriophyid mite Hirsutella thompsonii Mycelial application Life Sciences Animal Ecology Entomology Animal Genetics and Genomics Animal Systematics/Taxonomy/Biogeography
Content Type	Text
Resource Type	Article
Subject	Ecology Medicine Insect Science

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