Cold tolerance of coccons ofAllorhogas pyralophagus [Hym.: Braconidae] |
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Authors: | Ballal Chandish R Singh S P Jalali S K Kumar Pradyumn |
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Institution: | (1) Biological Control Laboratory Division of Entomology and Nematology, Indian Institute of Horticultural Research, Hessaraghatta Lake Post, 560089 Bangalore, India |
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Abstract: | Cold tolerance studies were conducted under laboratory conditions for coccons ofAllorhogas pyralophagus Marsh, a Mexican parasitoid of graminaceous borers. By storage, developmental time (from cocoon to adult emergence) could
be extended by 2 to 6 times. However, cocoons stored for more than 14 days at 2°C failed to survive, while at 5 and 10°C,
about 50% emergence was recorded for upto 21 days of storage. With respect to survival and adult longevity, 10°C seemed to
be the most suitable storage temperature. Pre-emergence period was also significantly increased by storing cocoons for 21
to 35 days at this temperature. Sex-ratio of emerging adults was not significantly affected by storage. Fecundity was adversely
affected in all the treatments except in the case of females emerging from cocoons stored at 5°C for 7 days. The progeny of
parasitoids which emerged from cocoons stored at 5 and 10°C for 35 days consisted of only males. It is clear from the present
study thatA. pyralophagus cocoons are more amenable to short-term storage.
Contribution No. 285/87 of the Indian Institute of Horticultural Research, Bangalore-560 089. |
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Keywords: | Allorhogas pyralophagus graminaceous borers parasitoid low temperature storage |
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