Abstract
Kharap beetle, Trogoderma granarium (Everts) (Dermestidae: Coleoptera) is very notorious stored cereals insect pest, as
well as of their commodities, throughout the world and can cause great economic losses. This research was planned to assess
the efficacy of some bio-pesticides including entomopathogenic fungi (EPF) (Metarhizium anisopliae and Isaria
fumosorosea), bacterial based insecticides (Spinetoram and Spinosad) and plant extract based commercial formulations
(Pongamia pinnata and Azadirachta indica), alone and in combinations, against larvae of T. granarium under laboratory
conditions. For mortality bioassays of bio-pesticides insect diet (maize kernels) was treated with three concentrations of each
bio-pesticide i.e., for EPF (0.5 × 108
, 1 x 108
and 1.5 × 108
conidia kg-1 grain) for bacterial based bio pesticide (0.5, 1.0 and
1.5ppm) and for plant extracts (50, 100 and 150ppm). Insect data regarding their percent mortality was recorded
subsequently by exposure time of 7, 14 and 21 days in each case. Best result producing treatments of each bio-pesticide were
identified and combine effect of best treatments of EPF and best treatments of remaining tested bio pesticides were evaluated
for percentage mortality. Among all the tested bio-pesticides Spinetoram performed best against T. granarium larvae by
giving 64.17% mortality with maximum concentration rate of 1.5ppm after 21 days followed by M. anisopliae whose mortal
ranges 63% after 21 days with concentration rate of 2 x 108
conidiakg-1 grain remained closed to that given by Spinetoram.
Spinosad proved as third best in efficacy while the results given by A. indica remained least significant. Combination of
EPFs with Spinetoram, Spinosad, A. indica and P. pinnata against test insects showed significant difference as compared to
their alone results. Higher mortality of targeted insect was observed in case of combine applications as compared to single
application of each bio-pesticide. Highest mortality percentage of 79.33% was noted with the combination of M. anisopliae
and Spinetoram after 21 days of exposure time. It is concluded that all the tested bio-insecticides are very effective to control
T. granarium. Therefore, these bio-insecticides can efficiently be used in integrated pest management strategies against
stored grain pests
Tauqir Anwar, Mansoor ul Hasan, Nazir Javed, Mazhar Hussain Ranjha. (2020) EFFICACY OF BIO-PESTICIDES AGAINST LARVAE OF Trogoderma granarium (EVERTS) (COLEOPTERA: DERMESTIDAE) ON MAIZE, Pakistan Journal of Agricultural Sciences, Volume 57, Issue 2.
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