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[article] | Title : |
Efficacy of Metarhizium anisopliae (Metsch.) Sorokin against the Potato Tuber Moth, Phthorimaea operculella (Zeller) in Consumable Potato, under Laboratory Conditions |
| Material Type: |
printed text |
| Authors: |
Pandey, S., Author ; M. Sporleder, Author ; Y. D. Gharti Chhetry, Author ; Giri, Y.P., Author ; Jurgen Kroschel, Author |
| Publication Date: |
2015 |
| Article on page: |
55-62 p. |
| Languages : |
English (eng) |
| Abstract: |
The potato tuber moth Phthorimaea operculella (Zeller) (Lepidoptera:
Gelechiidae) is major pest of potato (Solanum tuberosum L.) in tropical and
subtropical regions of the world causing serious economic damage especially in
non-refrigerated potato storerooms. Chemical pesticide use for post-harvest pest
management in farmers’ rustic storerooms causes health risks to farmers and
consumers, triggered a search for safer pest management alternatives, such as
use of entomopathogens. Metarhizium anisopliae (Metsch.) Sorokin culture
originally isolated from white grub larvae native from Nepal was grown on
artificial media and its biological activity assessed against the potato tuber moth
in the laboratory, using potato tuber surface contamination bioassay. A total of
5 bioassays were conducted. In four bioassays fresh fungus stock suspensions
were tested while in one bioassay the fungus stock suspension of the first
bioassay was reused after 8-month storage period at ambient temperature. All
probit lines revealed a common slope of 0.57. The first stock suspension revealed
an LC50-value of 6.9×106 conidia/ml while after 8-month storage a significant
activity loss of about 90% (7.2 ×107 conidia/ml) was observed. The other three
bioassays revealed LC50-values of mean 4.2×105 (2.9 to 6.1×105) conidia/ml
without significant differences in their potencies. According to the probit lines
(3-5) > 7.5x10^7 conidia/ml would be required to kill >90% PTM. Hence it can
be concluded that the M. anisopliae strain showed high biological activity
against PTM larvae and has potential as bio-control agent for controlling the
pest; however, activity can be significantly reduced if stored inappropriately or
for longer periods. |
in Nepalese Horticulture > v. 10: 1 [07/25/2015] . - 55-62 p.
[article] Efficacy of Metarhizium anisopliae (Metsch.) Sorokin against the Potato Tuber Moth, Phthorimaea operculella (Zeller) in Consumable Potato, under Laboratory Conditions [printed text] / Pandey, S., Author ; M. Sporleder, Author ; Y. D. Gharti Chhetry, Author ; Giri, Y.P., Author ; Jurgen Kroschel, Author . - 2015 . - 55-62 p. Languages : English ( eng) in Nepalese Horticulture > v. 10: 1 [07/25/2015] . - 55-62 p. | Abstract: |
The potato tuber moth Phthorimaea operculella (Zeller) (Lepidoptera:
Gelechiidae) is major pest of potato (Solanum tuberosum L.) in tropical and
subtropical regions of the world causing serious economic damage especially in
non-refrigerated potato storerooms. Chemical pesticide use for post-harvest pest
management in farmers’ rustic storerooms causes health risks to farmers and
consumers, triggered a search for safer pest management alternatives, such as
use of entomopathogens. Metarhizium anisopliae (Metsch.) Sorokin culture
originally isolated from white grub larvae native from Nepal was grown on
artificial media and its biological activity assessed against the potato tuber moth
in the laboratory, using potato tuber surface contamination bioassay. A total of
5 bioassays were conducted. In four bioassays fresh fungus stock suspensions
were tested while in one bioassay the fungus stock suspension of the first
bioassay was reused after 8-month storage period at ambient temperature. All
probit lines revealed a common slope of 0.57. The first stock suspension revealed
an LC50-value of 6.9×106 conidia/ml while after 8-month storage a significant
activity loss of about 90% (7.2 ×107 conidia/ml) was observed. The other three
bioassays revealed LC50-values of mean 4.2×105 (2.9 to 6.1×105) conidia/ml
without significant differences in their potencies. According to the probit lines
(3-5) > 7.5x10^7 conidia/ml would be required to kill >90% PTM. Hence it can
be concluded that the M. anisopliae strain showed high biological activity
against PTM larvae and has potential as bio-control agent for controlling the
pest; however, activity can be significantly reduced if stored inappropriately or
for longer periods. |
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