Vol. 6 (1) : January-February 2015 issue
Green Farming Vol. 6 (1) : 137-139 ; January-February, 2015
Life-table characteristics of arrhenotokous and thelytokous T. pretiosum Riley on eggs of Corcyra cephalonica Stainton
T. PRABHULINGA1*, N.E. THYAGARAJ2, K.K. KALAVATHI3 and S.K. JALALI4
Deptt. of Agricultural Entomology, University Agricultural Sciences, GKVK, Bangalore - 560 065 (Karnataka)
Designation : 1SMS *(prabhut07@gmail.com), 2Prof. & Head, 3Res. Associate, 4Principal Scientist
Subject : Entomology
Paper No. : P-1691
Total Pages : 3
Received : 09 April 2014
Revised accepted : 12 December 2014
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Citation :
T. PRABHULINGA, N.E. THYAGARAJ, K.K. KALAVATHI and S.K. JALALI. 2015. Life-table characteristics of arrhenotokous and thelytokous T. pretiosum Riley on eggs of Corcyra cephalonica Stainton. Green Farming Vol. 6 (1) : 137-139 ; January-February, 2015
ABSTRACT
Trichogramma pretiosum Riley is an important egg parasitoid on lepidopterans. Biological attributes of arrhenotokous and thelytokous T. pretiosum, was studied on Corcyra cephalonica under laboratory condition. The adult longevity in arrhenotokous and thelytokous T. pretiosum were 10.4 days and 10 days, respectively. The total female progeny produced during entire life span was 147.08 in thelytokous T. pretiosum and 90 in arrhenotokous T. pretiosum. The sex ratio of arrhenotokous T. pretiosum was 1:1 while for thelytokous it was 5:95 (M/F). The intrinsic rate of increase was 0.42 in arrhenotokous T. pretiosum and 0.48 in thelytokous T. pretiosum. These results revealed that in the net reproductive rate, weekly multiplication rate and the number of estimates in F2 generation are more in thelytokous T. pretiosum compared to arrhenotokous T. pretiosum. These results confirmed that biological attributes of arrhenotokous and thelytokous T. pretiosum are different. Thelytokous T. pretiosum have more practical implications in the field of biological control.
Key words :
Arrhenotokous, Life-table, Thelytokous, Trichogramma pretiosum.
