MICROBIAL CONTROL OF TOMATO FRUIT BORER, Helicoverpa armigera (Hubner) BY ENTOMOPATHOGENIC FUNGAL AGENTS
Loading...
Date
2009-07-10
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU
Abstract
The investigations on “Microbial control of tomato fruit borer,
Helicoverpa armigera (Hubner) by entomopathogenic fungal agents” were carried
out during 2008-2009 at the Bio-Control Research Laboratories (BCRL), Pest
Control (India) Pvt. Ltd., located at Sriramanahalli, Doddaballapur road,
Bangalore.
Dose mortality response between Helicoverpa armigera and
Beauveria bassiana, Metarhizium anisopliae, Nomuraea rileyi and
Verticillium lecanii in the laboratory indicated that mortality of larvae increased
with increase in concentration and exposure period. Younger larvae found to be
more susceptible to fungal species than older ones. N. rileyi (Nr1) proved superior
to B. bassiana (Bb1, Bb2, Bb3) and M. anisopliae (Ma1, Ma2, Ma3). Whereas,
V. lecanii (Vl1, Vl2, Vl3) failed to cause disease in H. armigera larvae. N. rileyi
(Nr1) was used for further studies.
Among the storage conditions, Nomuraea rileyi conidia in wettable powder
formulation and oil based formulation recorded highest per cent germination in
refrigerated conditions (40C) than at room temperature (27OC).
The wettable powder formulation of Nomuraea rileyi viz., Bentonite +
glucose (7:1) and Bentonite recorded 71 and 69 per cent mortality, respectively
and the oil based formulations viz., sunflower oil, sesame oil and ground nut oil
recorded 82, 77 and 77 per cent mortality respectively against 3rd instar larvae of
H. armigera under laboratory conditions.
In the field experiment, Nomuraea rileyi in sunflower oil formulation
(15.43 t/ac) and Bentonite formulation (14.83 t/ac) were proved better.
Significantly higher yield was noticed in chemical control (17.28 t/ac).
Description
Keywords
null